SY27 2314 7_3277_Troubleshooting_Guide_Jul78 7 3277 Troubleshooting Guide Jul78
SY27-2314-7_3277_Troubleshooting_Guide_Jul78 SY27-2314-7_3277_Troubleshooting_Guide_Jul78
SY27-2314-7_3277_Troubleshooting_Guide_Jul78 SY27-2314-7_3277_Troubleshooting_Guide_Jul78
User Manual: SY27-2314-7_3277_Troubleshooting_Guide_Jul78
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Maintenance library
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Display Station Models 1 and 2
Troubleshooting Guide
SY27·2314·7
Preface
The IBM 3270 Information Display System consists of
The· titles and form numbers of the two control unit
control units, display stations, printers, and optional
Troubleshooting Guides are listed below under
feature devices. This guide contains all the information
"Cornpanion Manuals". Both Troubleshooting Guides conrequired to maintain IBM 3277 Display Stations and
tain a glossary of terms that are applicable to control units
features such as Data Analysis - APL, keyboards, selectorand display stations.
light pen, magnetic card reader, security keylock, and
Companion Manuals:
audible alarm. The purpose of this guide is to present
maintenance and repair information rather than theory of
• 3271 Control Unit Models 1 and 2 Troubleshooting
operation information.
Guide; SY27-2311
This guide is organized in eight sections. Sections 1
• 3272 Control Unit Models 1 and 2 Troubleshooting
and 2 contain introductory and maintenance background
. Guide, SY27-2312
material. Sections 3, 4, and 5 contain the Symptom Index,
Troubleshooting Diagrams, and repair data. These three
.3274, . Control Unit, Maintenance Information,
sections contain all diagnostic procedures and repair infor- .1 SY27-2511
mation necessary to correct a display station malfunction.
• 3275/3277 Display Station Models 1 and 2 Parts
Miscellaneous reference data is included in. Section 6 ..
Catalog, S126~0005
Section 7 contains location diagrams to aid in identifying
.• IDR-M ·ID Reader-Motorized Theory-Maintenance-Parts
and locating the display station components referenced in
Catalog, SY26~4188
other sections of this guide. Instructions for installing the
display station are presented in Section 8.
The following publications may also prove useful:
To successfully use this guide and repair IBM 3277
• An Introduction to the 3270 Information Display
display stations, maintenance personnel should have a level
System, GA27-2739
of training equivalent to the 3270 system basic FE course.
Because the 3277 attaches to both local and remote control
• IBM 3270 Information Display System Component
units, an understanding of the control unit to. which the
Description,GA27-2749
display. station is attached is also helpful.
Eighth Edition (July, 1978)
This is a major revision of, and obsoletes, SY27-2314-6 with Techriical Newsletter
ISN31-0500. Information has been added to cover attachment to an IBM 3274Gontrol
Unit, and new information has been added throughout the guide. Significant changes or
additions to the text and illustrations are· indicated by a vertical line to the left of the
change.
Changes are periodically made to· the information herein; any such changes will be
reported in subsequent revisions or TechnicalNewsletters.
Text for this manual has been prepared with the IBM SELECTRIC ®CompQser.
A form is provided at the back of this publication for reader's cornments.lf the form has
been removed, comments may be addressed to:
Neighborhood Road, Kingston, N.Y., 12401
IBM Corporation, Dept. 63T.
©Copyright International Business Machines Corporation, 1972,1973,1974~1975,1976, 1978
ii
Contents
Section 1.
1.1
1.1.1
1.1.2
1.1.3
1.2
1.2.1
1.22
1.2.3
12.4
1.2.5
Maintenance Approach
Introduction
Online/Offline Maintenance
Field Replaceable Units (FRU)
Troubleshooting Aids
Trouble Analysis
Obvious Symptoms
I solation to a Display Station
Offline Symptoms
Formatted Buffer Symptoms
Customer-Reported Failures
1-1
1-1
1-1
1-1
1-1
1-1
1-1
1-1
1-2
1-2
1-2
Section 2.
2.1
2.1.1
2.1.2
2.1.3
2.1.3.1
2.1.3.2
2.1.3.3
2.1.3.4
2.1.4
2.1.5
2.2
2.2.1
2.2.2
2.2.2.1
2.2.2.2
2.2.3
Tools and Diagnostic Programs
Maintenance Tools
Customer Engineer Tool Kit
Oscilloscope
Logic Probes
Description
Probe Usage
Probe Checkout
Probe Repair
Alignment Mask
I DR FE Test Card
Diagnostic Programs
Test Patterns
Requesting RFT Patterns
Local Display Stations
Remote Display Stations
Online Tests (OLTs)
2-1
2-1
2-1
2-1
2-1
2-1
2-1
2-1
2-3
2-3
2-3
2-3
2-3
2-12
2-12
2-13
2-13
Section 3.
3.1
3.2
3.3
Symptom Index
Symptom I ndex Usage
Developing Symptoms
I ntermittent Problems
3-1
3-1
3-1
3-2
Section 4.
Troubleshooting Diagrams
4-1
Section 5.
5.1
5.1.1
Checks, AdjustmentS, and Removals
Checks
Display Station Test Using Test
Pattern 1
Display Station Operational Test
(without Test Pattern 1)
Voltage Checks
Low-Voltage DC Checks
High-Voltage Check
Arc-Suppression Check
6.3V AC Check
High-Voltage Power Supply Check~ .
Keyboard Checks
Voltages
Key Module and Encoding - Type A
Keyboards Only
Output Codes
Shift Key Modules - Type A Keyboards Only
Spacebar Assembly Mechanical Checks
Adjustments
Display Image Adjustments
Brightness
5-1
5-1
5.1.2
5.1.3
5.1.3.1
5.1.3.2
5.1.3.3
5.1.3.4
5.1.3.5
5.1.4
5.1.4.1
5.1.4.2
,5.1.4.3
5.1.4.4
5.1.4.5
5.2
5.2.1
5.2.1.1
5-1
5-2
5-3
5-3
5-4
5-4
5-4
5-5
5-5
5-5
5-5
5-6
5-6
5-6
5-6
5-6
5-7
5.2.1.2
5.2.1.3
5.2.1.4
52.1.5
5,2.1.6
5.2.1.7
5.2.2
52.3
5.3
5.3.1
5.3.2
5.3.2.1
5.3.2.2
5.3.2.3
5.3.2.4
5.3.2.5
5.3.2.6
5.3.2.7
5.3.2.8
5.3.2.9
5.32.10
5.3.2.11
5.3.2.12
5.3.3
5.3.3.1
5.3.3.2
5.3.3.3
5.3.3.4
5.3.3.5
5.3.3.6
5.3.3.7
5.3.4
5.3.4.1
5.3.4.2
5.3.5
5.3.5.1
5.3.5.2
5.3.5.3
5.3.5.4
5.3.5.5
5.3.5.6
5.3.5.7
5.3.5.8
5.3.5.9
5.3.5.10
5.3.5.11
5.3.6
5.3.7
5.3.8
5.3.9
5.4
5.4.1
5.4.2
5.4.3
5.4.4
Contrast
Focus
Yoke
Magnetic Centering Rings
Modell Analog Card Adjustments
Model 2 Analog Card Adjustments
-12V Regulator Card
OFF-PUSH Switch (Model 2 Only)
Removals
Covers
Power Components
Low-VQltage Power Supply Assembly
-12V Regulator Card
AC Capacitor
Modell Prime Power Box
Model 2 Prime Power Box
Modell Ferro Transformer (60-Hz)
Modell Ferro Transformer (50-Hz)
Model 2 Ferro Transformer (60-Hz)
Model 2 Ferro Transformer (50-Hz)
High-Voltage Power Supply
Fuses
...
Voltage Distribution Board (Model 2
Display Stations Only)
Analog Components
CRT
Yoke and Shields
Model 1 Analog Card
Model 2 Analog Card
Model 1 Brightness and Contrast Controls
Model 2 Brightness and Contrast Controls
Power Control Switch
Logic Components
Logic Card
Logic Board
Keyboard Components
Keyboard from Display Station
Keyboard Top Cover
Keyboard Assembly from Bottom Pan
Audible Feedback Assembly
Keybutton
Type A Switch Module
Type A Spacebar Assemblies
Keybutton Support Modules - Type A
Keyboards Only
Type B Module
Type BSpacebar
Circuit Board and Electronics Assembly Type B Keyboards 0 nly
Audible Alarm (Optional Feature)
Security Keylock (Optional Feature)
Selector Light-Pen (OPtional Feature) •
Operator Identification Card Reader
(Optional Feature)
Type B Keyboard Maintenance Aids
Cleaning
Liquid Spills
Key Modules
Contamination Shields
"
5-7
5-7
5-7
5-7
5-7
5-8
5-8
5-8
5-9
5-9
5-10
5-10
5-10
5-10
5-10
5-10
5-10
5-11
5-11
5-11
5-11
5-11
5-11
5-12
5-12
5-13
5-13
5-13
5-13
5-14
5-14
5-14
5-14
5-14
5"14
5-14
5-14
5-14
5-14
5-15
5-15
5-17
5-18
5-18
5-20
5-20
5-20
5-20
5-21
5-21
5-21
5-21
5-21
5-21
5-21
Contents
iii
5.4.5
5.4.6
5.4.7
5.4.8
Protective Membrane/Shield
Ground Check
Ground Loop Isolation
Crooked or Loose Key tops
5-22
5-22
5-22
5-22
Section 6.
6.1
6.1.1
6.1.2
6.2
6.2.1
6.2.2
6.2.3
6.3
6.3.1
6.3;2
6.4
6.4.1
Reference Data
Controls
External Controls
I nternal Controls
Indicators
External Indicators
Internal Indicator (SWEEP INDIC)
Arc-Suppression Neon
Keyboards (Optional Feature)
Types of Keyboards
EBCDIC Keyboard Codes
ASCII Options
ASCII Character Generators (Optional
Features)
..
ASCII Keyboards (Optional Features)
APL Options
6-1
6-1
6-1
6-2
6-2
6-2
6-3
6-3
6-3
6-3
6-3
6-3
6.4.2
6.5
6-3
6-4
. 6-4
6.5.2
6.5.3
6.6
Line Buffer and Character Generator
Card
AP L Keyboard
Text Keyboard
Reference Diagrams
Section 8.
8.1
8.2
8.2.1
8.2:2
8.2.3
8.2.4
I nstallation Instructions
General
Installation
Line Voltage Check
Feature Installation
Prepower-On Checks
Power-On Checks
8.2.5
Hexadecimal Address Label
6.5.1
IAPpendix A. Offline Selector Light Pen Test
Index
· 6-4
6-4
6-5
6-5
8-1
8-1
8-1
8-1
8-1
8-2
8-2
· 8-2
· A-l
· X-1
Diagrams
1-1
2-1
2-2
2-3
2-4
2-5
2-6
2-7
2-8
2-9
2-10
3-1
3-2
3-3
3-4
3-5
3-6
3-7
3-8
3-9
3-10
3-11
3-12
3-13
3-14
3-15
3-16
3-17
3-18
3-19
3-20
3-21
3-22
3-23
4-1
iv
3277 Maintenance Approach
Logic Probes
Alignment Mask, Modell
Alignment Mask, Model 2
Test Pattern 1 (USA EBCDIC)
T est Pattern 2
T est Pattern 3
Test Pattern 5 (USA EBCDIC)
APL Keyboard Test Pattern
Character Differences for ASCII and
WTC Languages
Test Pattern 10 Numbers
Test Pattern 1, Modell
Test Pattern 1, Model 2
T est Pattern 2
Test Pattern 3
Yoke Back Too Far on CRT Neck
Yoke Tilted
Centering Rings Not Adjusted Properly
Character Height Too Small
GlowOnly on CRT
Single Horizontal Line on CRT
Modell Raster
Model 2 Raster
Cursor in Every Row
Box in Every Character Position
No Horizontal Sync
No I nterrow Spacing
Correct Display after POR
Out of Focus Image
Yoke Horizontal Return Line Open
Open in Yoke Horizontal Winding
1/2 Vertical Yoke Open
Horizontal Yoke Open
Vertical Yoke Open
Display Station Troubleshooting Diagrams
(29 Sheets)
1-2
2-2
2-3
2-4
2-5
2-7
2-8
2-9
2-11
2-12
2-12
3-8
3-8
3-8
3-8
3-8
3-8
3-9
3-9
3-9
3-9
3-9
3-9
3-10
3-10
3-10
3-10
3-10
3-10
3-11
3-11
3-11
3-11
3-11
4-3
5-1
5-2
5-3
5-4
5-5
5-6
5-7
5-8
5-9
5-10
5-11
5-12
5-13
5-14
6-1
6-2
6-3
6-4
6-5
6-6
6-7
6-8
6-9
6-10
6-11
6-12
6-13 I
6-14
6-15
6-16
OFF-PUSH Switch Adjustment
Switch Module Removal (Type A)
Unsoldering Lead Frame Terminals (Type A)
Lead Frame Removal (Type A)
Switch Plunger Return Spring Positioning
(Type A)
Switch Module Orientation (Type A)
Torsion Bar Removal (Type A)
Spacebar Guide Module Removal (Type A)
Screw Loosening (Type B)
Keyboard Assembly Separation (Type B)
Module Removal (Type B)
Circuit Board and Electronics Assembly
(Type B)
Base Plate Ground Studs (Type B)
Spacebar Pivot Removal (Type B)
External Controls and Indicators
Typewriter Keyboard
APL Keyboard - US
Operator Console Keyboard
Data Entry Keyboards
Text Feature Keyboard
USA EBCDIC Keyboard Codes (2 .Sheets)
APL Modified EBCDIC Keyboard Codes
(2 Sheets)
Text Keyboard Codes (EBCDIC) (2 Sheets)
3277 APL Keyboard Codes with APL
Turned OFF
3277 APL Keyboard Codes with APL
Turned ON (2 Sheets)
3277 APL Keyboard Codes with - US
EBCDIC
Text Feature Keyboard Code - US EBCDIC
(2 Sheets)
WTC Language Keyboard Codes
ASCII and WTC Language Keyboard Codes
Logic Card Data (2 Sheets)
5-9
5-15
5-15
5-16
5-16
5-16
5-17
5-17
5-18
5-18
5-19
5-19
5-19
5-20
6-1
6-6
6-6
6-7
6-7
6-8
6-9
6-11
6-13
6-15
6-16
6-18
6-20
6-22
6-22
6-23
6-17
6-18
6-19
6-20
6-21
6-22
6-23
7-1
7-2
7-3
7-4
7-5
7-6
7-7
7-8
7-9
Probe Pin Data
Keyboard Feature Jumpers
Type A Keyboard E ncodi ng
Board Layout by Card Function - Without
Features (Card Side View)
Board Layout by Card Function - With
Features (Card Side View)
Board Layout Pin Identification Data
(Pin Side View)
Data Flow (foldout; at back of manual)
Model 1 Locations, Front View
Model 1 Locations, Left-Side View
Model 1 Locations, Rear View
Model 2 Locations, Front View
Model 2 Locations, Right-Side View
Model 2 Locations, Left-Side View
Type A Keyboard Locations
Type A Keyboard Pin Assembly and Terminal
Location
Low-Voltage Printed Circuit Board
6-25
6-26
6-26
6-27
6-28
6-29
FO-1
7-1
7-2
7-3
7-4
7-5
7-6
7-7
7-10
7-11
7-12
7-13
7-14
7-15
7-16
7-17
7-18
7-19
7-20
7-21
Low-Voltage Printed Circuit Board Shield
Model 2 Voltage Distribution Board
Model 1 Prime Power Box
Brightness and Contrast Control Terminals
High-Voltage Power Supply
Model 1 Arc-Suppression Board
Analog Card (2 Sheets)
Type B Keyboard Locations
Type B Keyboard Assembly
Type B Keyboard Assembly Pin and Terminal
Locations
Type B Keyboard Assembly Pin and Terminal
Locations (3270 Data Analysis - APL
Feature)
Type B Keyboard Assembly Pin and Terminal
Locations (Text Feature)
8-1
50-Hz Ferro TB-1
7-10
7-10
7-11
7-11
7-12
7-12
7-13
7-15
7-16
7-17
7-18
7-19
. 8-1
7-8
7-9
Abbreviations
AID
ALD
APL
ASCII
attention identification
automated logic diagram
A Programming Language
American Standard Code for Information
Interchange
CE
CK
CNCL
CPU
CRT
CU
CW
Customer Engineer
check
cancel
control processing unit
cathode-ray tube
control unit
control word
DEL
DUP
delete
duplicate
EBCDIC
EC
EOF
extended binary-coded-decimal interchange code
engineering change
end of field
FE
Ferro
FRU
Field Engineering
ferro-resonant transformer
field replaceable unit
GLP
General Logic Probe
HV
high voltage
IDR
INS MODE
I/O
identification reader
insert mode
input/output
KB
keyboard
LV
low voltage
MDT
modified data tag
NL
new line
OLT
online test
PA
PC
PCBD
PF
POR
PS
program access
printed circuit
printed circuit board
program fu nction
power on reset
power supply
RFT
request for test
SLT
SMS
SOR
solid logic technology
standard modular system
start of record
TB
TCU
TEST REQ
TP
term inal board
transmission control unit
test request
test pattern, test point
VOM
volt-ohmmeter
Abbreviations
v
Safety Notices
General:
I
DANGER: Safety glasses must be worn when working on the
machine with power on and covers removed.
I
DANGER: High voltage can be present at the CRT when
power is off.
The following DANGER notices are located in the applicable
procedures:
DANGER
All persons handling a CRT or who are near an exposed CRT
under vacuum must wear safety glasses and long-sleeved
garments.
I
~
o
ANGER
his pin (P1-6 on the analog card) has 600V on it.
ttempt should be made to measure this voltage.
No
DANGER
The 3277 Model 2 Display Station weighs about 90 pounds.
Two men should be used to move this unit. Separate the
upper chassis from the lower chassis before trying to move the
Model 2 display station alone. (See paragraph 5.3.2.8, steps
1-7, to separate the two chassis.)
DANGER
All power component removal and replacement procedures
must be performed with power turned off and with the power
cord removed from the wall or from the input jack at the
display station.
I
vi
C E Safety Practices
All Customer Engineers are expected to take every safety precaution
possible and observe the following safety practices while maintaining
IBM equipment:
.
1. You should not work alone under hazardous conditions or around
equipment with dang~rous voltage. Always advise your manager if;
you MUST work alone.
2. Remove all power AC and DC when removing or assembling major
components, working in immediate area of power supplies,
performing mechanical inspection of power supplies and installing
changes in'machine circuitry.
3. Wall box power switch when turned off should be locked or tagged
in off position. "00 not Operate" tags, form 229-1266, affixed
when applicable. Pull power supply cord whenever possible.
4. When it is absolutely necessary to work on. equipment having
exposed operating mechanical parts 'or exposed live electrical
circuitry anywhere in the machine, the following precautions must
be followed:
a. Another person familiar with power off controls must be in
immediate vicinity.
b. Rings, wrist watches, chains, bracelets, metal cuff links, shall
not be worn.
c. Only insulated pliers and screwdrivers shall be used.
d. Keep one hand in pocket.
e. When using test instruments be certain controls are set
correctly and proper capacity, insulated probes are used.
f. Avoid contacting ground potential (metal floor strips,machine
frames, etc. - use SUitable rubber mats purchased locally if
necessary).
5. Safety Glasses must be worn when:
a. Using a hammer to drive pins, riveting, staking, etc.
b. Power hand drilling, reaming, grinding, etc.
c. Using spring hooks, attaching springs.
d. Soldering, wire cutting, removing steel bands.
e. Parts cleaning, using solvents,sprays,cl~ners, chemicals, etc.
f. All other conditions that may be hazardous to your eyeS.
REMEMBER, THEY ARE YOUR EYES.
6. Special safety instructions such as handling Cathode Ray Tubes and
extreme high voltages, must be followed as outlined in CEM's and
Safety Section of the Maintenance Manuals.
7. Do not use solvents, chemicals, greases or oils that have not been
approved by IBM.
8. Avoid using tools or test equipment that have not been approved
by IBM.
9. Replace worn or broken tools and test equipment.
10. The maximum load to be lifted is that which in the opinion of you
and management does not jeopardize your own health or well-being
or that of other employees.
11. An safety devices such as guards, shields, signs, ground wires, etc.
shall be restored after maintenance.
12. Each Customer Engineer is responsible to be certain that no action
on his part renders product unsafe or exposes hazardsto customer
personnel.
13. Place removed machine covers in a safe out-of-the-way placewhere
no one can trip over them.
14. All machine covers must be in place before machine is returned to
customer.
15. Always place CE tool kit away from walk areas where no one can
. trip over it H.e., under desk or table).
16. Avoid touching mechanical moving parts (i.e., when lubricating,
checking for play, etc.).
17. When using stroboscope - do not touch ANYTHING - it may be
mOving..
18. Avoid wearing loose clothing that may be caught in machinery.
Shirt sleeves must be left buttoned or rolled above the elbow.
19. Ties must be tucked in shirt or have a tie clasp (preferably
nonconductive) approximately 3 inches from end. Tie chains are
not recommended .
. 20. Before starting .equipment, make certain fellow CE's and customer
personnel are not in a hazardous position.
21; Maintain good housekeeping in area of machines while performing
and after completing maintenance.
Artificial Respiration
General Considerations
1. Start Immediately, Seconds Count
Do not move victim unless absolutely necessary to remove from
danger. Do not wait or look for help or stop to loosen clothing,
warm the victim or apply stimulants.
2. Check Mouth for Obstructions
Remove foreign objects - Pull tongue forward.
3. Loosen Clothing - Keep Warm
Take care of these items after victim is breathing by himself or when
help is available.
4. Remain in Position
After victim revives, be ready to resume respiration if necessary.
. 5. Can a Doctor
Have someone summon medical aid.
6. Don't Give Up
Continue without interruption until victim is breathing without help
or is certainly dead.
Rescue Breathing for Adults
Victim on His Back Immediately
1.Ctear throat of water, food, or foreign matter.
2. Tilt head back to open air passage.
3. Lift jaw upto keep tongue out of air passage.
4. Pinch nostrils to prevent air leakage when you blow.
5.Blow until you see chest rise.
S.Remove your lips and allow lungs to empty.
7. Listen for snoring and gurglings, signs of throat obstruction.
S. Repeat mouth to mouth breathings 10-20 times a minute.
Continue rescue breathing until he breathes for himself.
'~.'
~~
W{
Thumb and
finger positions
~Finalmouth
,
.
.
•
o mouth
p .ition
~
Reprint Courtesy Mine Safety Appliances Co.
Safety Notices
vii
,
LEGEND
)
Terminal
Indicates beginning point of a Troubleshooting Diagram.
Action
I:
Indicates a major action. When more than one action is described, bullet symbols appear
to left of each action.
Annotation·
Gives descriptive comment or explanatory note.
<>
Decision
Indicates a point in a Troubleshooting Diagram where a branch to alternate data paths
is possible.
Probe
Indicates a point in a Troubleshooting Diagram where a logic pin should be probed with
the logic probe. Pin is specified in the symbol. Path to be followed after probing is
determined by probe result.
o
Card Change
Indicates that card or cards specified in symbol should be changed and new ones installed.
v
Off-Page Connector
Indicates connection point between different sheets of the Troubleshooting Diagrams.
On-Page Connector
Indicates connection between two parts of the same sheet or diagram. Arrow leaving
symbol points to correspondingly-numbered symbol (Iine-of-sight).
Major Data Path
Minor Data Path or Control Line
Data Bus
Number of lines on bus is identified in circle.
a
7P
Data Transfer
Identifies data bits transferred to or from a logic element.
Screwdriver Adjustment
Switch
viii
Section 1.. Mainte,u."ClfJ'y~~
1.1 INTRODUCTION
1.1.3~2
Maintenance of IBM 3277 Display Stations (including
repair and adjustment of Modell and Model 2 units) and of
attached features is described in this guide. Features that
can be attached to a 3277 include Data Analysis - APL
(available on the 3277 Model 2 only), keyboards, a selector
light-pen, and an operator identification card reader.
The objective of display station maintenance is to return
the failing unit to customer service as quickly as possible.
This guide leads the Customer Engineer through procedures
that enable him to adjust or replace a malfunctioning
component.
The Customer Engineer.isdJrected
Diagrams from th~ Symptornlnde)(.:
procedures to isolate a ,fallingFHU '
adjustment. The diagrams ". calf
I·'"''
observations that should ? -
=';
I /
01 2 3 l+ 5 6 7 8 g) . - A
COpy ABOVE IN THIS LINE
?SEL PEN TEST
> SEL PEN TEST
ADR-6G48
3277 Modell - Attached to 3271 or 3272, Modell or 2
3277 Modell - Attached to 3271, Modelf1
..
'
.
Diagram 2-4. Test Pattern 1, USA EBCDIC (Sheet 1 of 2)
ToolsandDiagno~icPrOlP'ams
2--5
EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
H
H
H
H
H
H
H
H
H
H
00
00
H
H
H
TEST PATTERN FOR 3275-1/3277-1
H
H
ALIGNMENT
H
H
* UNPROTECTED AREA
*
H
ADR-6040 H
H
EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
3277 Mode.1 1. - Attached to3271 or 3~72i~oder 1 ().~ 2
Note.~ ADR -:- appears oni·Ywhenpattern is called In fromqLTE.P.
Diagram 2-5. Test Pattern 2 ,
Tools and Diagnostic Programs
2.7
Note: ADR - appears only when
Diagram 2·6. Test Pattern 3
~·8
patte~~isca"ed
in fromOL T~P ..
,
' , \
Dia!Jratn2·7,,~"'est 'j)atterrl~,US~EBC[)I¢(She~t~:1" Of 21
Tools and Diagnostic Programs
2.9
Note: Use Diagram 2-9 to determine unique character
re~lacementsWheIlASC,,~~·wJiC!~n9u~g~.are..U$ed..
3277 Model 2 - Attached to 3271, Model 12
Diagram 2-7. Test Pattern 5, USA EBCDIC (Sheet 2 of 2)
2-10
Note: Depress TEST R EQ key to end test.
3277 Model 2 - Attached to 3272, Model 2
3277 Model? - Attached to 3271, Model 2 or 12
Diagram 2-8. APl Keyboard Test Pattern
Tools and Diagnostic Programs
2-11
Hex
Language
.'
'
Code/G rap h ic
5A
5B
7B
7C
7F
4F
!
]
]
$
II
$
$
I
I
(5
U
U
¢
.8.
#
#
#
A
@
4A
..•..
~
*USA EBCDIC
USA ASCI I-A
USA ASCII-B
Austrian/German
Danish/Norwegian
Finnish/Swedish
Portuguese
Spanish
United Kingdom
..
[
[
0
A
¢
.a
.a,8.'
~
~
!
!
$
P+
£
@
II
@
II
q
A
k
¢
Ie,
A
0
If.
A
'"
0
0
N
#
@
@
N
II
!
I
I
,
I
t
I
5F
-,
-,
A
--,
--,
--,
--,
--,
--,
I!
*Belgian, French, and Italian languages use the USA EBCDIC character set.
Diagram 2-9. Character Differences for ASCII andWTC Languages
2.2.2 Requesting RFT Patterns
2.2.2. 1 Loca/ Display Stations
R FT patterns can be reqLJested for 3277 Display Stations
that are. attached to 'alocal control unit (3272) or to a
remote control unit (3271 Modell or 2). Patterns can be
requested· from one .display station to be displayed on
ano:her. (RFT patterns cannot be usedfor 3277 Display
Stations attached to a 3274 Control Unit. Refer to
Appendix A for procedures for these 3277s.) To display
patterns, the controlling CPU must be operating under as
BTAM (Operating System Basic Telecommunications
Access Method) or DOS BTAM (Disc Operating System
Basic Telecommunications Access Method), and the
application program must be set up to accept test requests.
The system programmer can verify that the requirements to
request R FT patterns are met. The ··eight test patterns
(four EBCDIC and four ASCII) that can be requested by
R FTs and. their identification numbers are listed in
Diagram 2-10.
1. Position the cursor at the top left (character position 0)
of an unformatted screen. (One way to accomplish this
is to press the C LEAR key. and then press the RESET
key.)
2. From' the keyboard, enter the R FT request message in
the following format:
I
Test Pattern
10 Number
EBCDIC
1
2 (Model 1)
3 (Model 2)
5
23
24
25
27
,
ASCII
~9
30
31
33
Diagram 2-10. Test Pattern 10 Numbers
2-12
XXYYNCUU
where:
The number of the test pattern desired. Use
EBCDIC column of Diagram 2-10.
Any number from 01 to 99. This number
YY
specifies the number of times the pattern
will be repeated.
The number 3. This identifies the request as
N
coming from a display station attached to a
3272 Control Unit.
The three-digit hexadecimal number of the
CUU
channel (C) and the display station (UU)
address to which the pattern is to be sent.
Alphabetic characters in the hexadecimal
number mUst be entered in uppercase.
3. Press TEST REQ key. INPUT INHIBITED indicator
shpuld come on.
XX
4. The desired pattern should appear within 15 seconds. If
INPUT INHIBITED indicator stays on and the pattern
does not appear, proceed as follows:
a. Repeat the request while ensuring that steps 1-3 are
performed correctly.
b. Check that the operating system and the BTAM
application program are still executing.
c. Check that the BTAM application progr~m is set up
for online test requests. (The customer's system
programmer can provide this information.)
2.2.2.2 Remote Display Stations
1. Position the cursor at the top left (character position 0)
of an unformatted screen. (One way to accomplish this
is to press the CLEAR key and then press the RESET
key.)
2. From the keyboard, enter the R FT request message in
the following format:
XXYYNMMDD
where:
XX
YY
N
MM DD ;:::
The number of the test pattern desired. Use
appropriate column of Diagram 2-10.
Any number from 01 to 99. This number
specifies the number of times the pattern
will be repeated.
The number 4, This identifies the request as
coming from a display station attached to a
3271 Control Unit.
The selection address characters of the
control unit (MM) and the display station
(DD) to which the pattern is to be sent.
(The release level of the operating system
being used determines what characters will
be entered. Check with the customer programmer for this information.)
3. Press TEST REO key. INPUT INHIBITED indicator
should come on,
4. The desired pattern should appear within 15 seconds. If
INPUT INHIBITED indicator stays on and the pattern
does not appear, proceed as follows:
a. Repeat the request while ensuring that steps 1-3 are
performed correctly.
b. Check that the operating system and the BTAM
application program are still executing.
c. Check that the BTAM application program is set up
for online test requests. (The customer's system
programmer can provide this information.)
2.2.3 Online Tests (OL Ts)
Online tests may be available, at the customer's OPtion, to
aid in maintaining 3277 Display Stations, Detailed descrip,
tions and instructions for using OL Ts are contained in the
diagnostic program binder that is shipped with each control
unit. Control unit ML TGs also contain this information.
Most OL T routines apply to control units. The following
three routines apply to display stations:
1. KEY - This routine handles manually generated interrupts from the keyboard, selector light-pen, and program
function keyboard. The results of the interrupts are
. presented on the display station screen, informinQ the
CE of the success or failure of the interrupt operation.
This routine also reads back data entered from the
keyboard to check lowercase character codes.
2. MAG - This routine tests the operator identification card
reader and identification cards.
3. PAT - This routine displays the test patterns described in
paragraph 2.2.1. The test patterns appear in sequence on
the CRT after they are initially called in. An explanatory
message containing instructions for running the test
pattern sequence precedes Test Pattern 1.
Tools and Diagnostic Programs
2.13
Section
3.1
SYMPTOM INDEX USAGE
The Symptom Index liststrouble symptoms that could be
encountered on 3277 Display Stations and features. Illustrations that show both correct and in~orrect display
,images are also, contained in this section. Use the Symptom
Index and illustrations as the first step in asystematic
method of resolving display station problems. The index is
divided into six major categories:
1. Display malfunctions.
2. Keyboard malfunctions.
3. Selector light-pen malfunctions.
4. Power malfunctions.
5.' CPU error indications.
6. Operator identification card reader malfunctions.
Some categories are divided into subcategories, making it
easier'to relate the trouble 'experienced to the correct item
in the index. Beginning with 1A 1, the first item that most
closely describes the display station trouble should be used.
Categories and specific items are identified by a one-, two-,
or three-letter/number code (e.g., 1 A 1, 2G, or 4) in the left
columh of the index. 'The c6de specifies the entry point
into the Troubleshooting Diagrams in Section 4.
the right column of the Symptom Index specifies action
to take to remedy the display station problem. That
column directs the Customer Engineer to a sectio'n troubleshooting diagram sheet or specifies a logic card (or cards) to
change. When more than one card is listed, isolate the
failing card by card swapping from among those specified.
Change the'.failing card and return the others to stock. The
right column may also specify an adjustment procedure in
Section 5.
Diagrams 3-1 through 3-24 show both correct and some
incorrect display images. The symptom list refers to these
illustrations to aid in identifying display station symptoms.
As an aid to rapid repair, diagrams that show incorrect
display images also specify the repair action.
3.2 DEVELOPING SYMPTOMS
Display station malfunctions should be isolated offline
unless the trouble occurs only when operating online
through the control unit to the host CPU. Failures of this
type are listed ,in Category 5 (CPU Error Indications).
Display station operations that require a formatted buffer
for failure symptoms to become evident are:
3~Symptom
Index
1. Selector light-pen operations.
2; Display intensity control : (high ,intensity' and nondisplay).
3. Protected and numeric field operations.
4. Tab op,erations;
5. Erase input and erase field operations.
T est Pattern 1 contains fields that test these operations.
The test pattern may be loaded from the system as an RFT
or OL T. Test tapes can also be used to load the patterns
necessary to test these operations. Symptoms that require
a formatted buffer are marked with an asterisk (*) in the
Symptom Index.
Note: Appendix A contains offline procedures to format
I
the buffer to test the selec,tor light-pen feature on 3277s
attached to a 3274 Control Unit.
Offline symptoms should be developed by performing
the following test sequence after, the 1/0 signal cable is
removed.
1. Turn power on. (Always begin fr'om a power-on reset
condition.)
2. Test cursor move keys~, t, ,},~, ~, ~;~
,3. Test CLEAR key.
4. Enter four or five characters.
5. Press Tab (~ ) key.
6. Press Backspace (~) four times.
7. Enter four ch'aracters.
8. Press Backspace (~) four times.
9. Press INSMODE.
10. Enter four or five characters.
11. Test DEL key.
0 liJ'fJ
o
fJ
Normal Mode - Go to new line. Text Feature
(Code Mode) - Go to new line.
Print [B and go to new line.
Stop the test sequence and go to the Symptom Index
when the first failure occurs.
Do steps 12, 13, and 14 if the Data Analysis - APL
Feature is installed.
12. Press the APL ONIOFF key.
13. Enter four or five characters.
14. While holding the APL ALT key depressed, enter four
or five APL alternate shift characters.
Stop the test sequence and go to the Symptom Index
when the first failure occurs.
Symptom Index
3-1
3.3IN1ERMffTENTPROBLE,MS
Intermittent problems can be caused by excessive ripple on
the output voltage of the display station LV power supply,
and by missing or improperly connected ground wires on
control units and display stations.
Excessive power supply ripple voltage can cause intermittent data checks and I/O errors. To' minimize
intermittent problems caused by the LV power supply ;
make the following checks:
1. Check that all power supply capacitor screws are tight.
2. Check that the LV power supply output voltages do not
exceed the specified tolerances . given in paragraph
5. ~ .3-:1.
3. ,Check that the LV power supply output r'ipple voltages
do not exceed the following tolerances:
PS Voltqge
+5
+8
Tolerance (mv)
200
300
Improper ground connections resulting in ground loops
can cause intermittent problems such as: timeouts,
"hanging in transmit", failure of "request-to-send" to fall
false status information, data checks with and without uni~
specify, equipment checks, and intervention required. To
minimize intermittent problems caused by improperly
cor'lnected or missing ground wires, check the ground
system, as follows:
1. Check the display station ac power connector for loose
or otherwise poor ground connections.
2. Check for missihg ground connections at the control
unit:
8. Ensure that power is off at the control unit and the
attached display stations, that power cords are
plugged into the ac receptacles, and that the coaxial
3·2
cable is connected at the display station(s) and
disconnected at the control unit.
b. Measure the ac voltage at the control unit, between
any 008 pin and frame ground. A reading of OV is
correct. If 50 to 70 volts are present, the ground
connection is missing.
3. Check the control unit and display station ground
connections as follows:
'
,
a. With po'wer off, and the control unit connected to
the CPU (or modem), and the coaxial cable to the
display station plugged at the control unit end
measure 0 ohm at the control uni~ betw,een dc ground
, and frame ground.
b. Measure 0 ohm at th'e display station between the end
of the coaxial cable shield and frame ground.
4. Check the control unit and display station for ground
loops:
a. In a remote installation, check that signal ground and
frame ground are connected at one location '6nly,
either in the external modem or in the modem cable
that is connected to the 3271 unit.
'
b. In a local installation, ch,eck that signal and frame
ground are connected at one location only, either in
the channel or in the CPU.
c. Disconnect the channel or modem cable a~ the
control unit and all device cables at the co~trollmit,
and check for an infinite resistance reading between
control unit signal ground (008) ~nd frame ground.
d. With the display station disconnected from the
control unit, check for a minimum resistance read'ing
of 7K or 10K ohms between the disp'lay station signal
and frame grounds.
Note: Also, if a keyboard is attached, check the
keyboard cable for ground loops. I nstallation of ECA
035 corrects keyboard ground loop prpblems:
SYMPTOM INDEX
Diagram Sheet or
Direct Action Repair
Symptom
Note: Bad or missing green wire grounds on display stations or control units can cause
failures ranging from intermittent to catastrophic. Verify p~oper grounding by using ground
checker PN 9900453.
1. DISPLAY MALFUNCTIONS
A.
B.
No Display:
1. No visible light or glow on CRT. (Device Check not indicated; no cursor,
characters, or indicators displayed.)
2. Glow only on CRT (Diag 3-9)
Sheet 2
Sheet 4
Intensity and Focus:
Sheet 4
1. One horizontal line on CRT (Diag 3-10)
2. Model 1 - Full raster on screen (Diag 3-11) OR
Model 2 - 24 rows of nine scan lines with space between each row (one row of
ten scan lines) (Diag 3-12) . . . . . . . . . . . . . . . . . . .
3. Block displayed in every character position; cursor normal (Diag 3-14).
a. INPUT INHIBITED lighted
.................
b. INPUT INHIBITED not lighted
...............
4. Display too dim or too bright (No control of intensity), or dim and blurred (no
Change card J2.
Change card K2.
effect usi ng display focus control).
Sheet 5
5. Characters out of focus (Diag 3-18)
Sheet 5
*6. Dual-intensity problems or characters displayed that should not
Sheet 6
7. Display erratic (e.g., display flashes, characters move, more than one cursor)
Sheet 6
8. Screen full of lines
............. .
Sheet 6
9. Retrace unblanked
............. .
Change cards H2, J2, K2.
10. Random data on screen. INPUT INHIBITED lighted
11. Cursor on left side in all rows
Change card H2.
. . . . . . . . .
Change card H2.
Change card J2.
12. One dot at character location zero cursor position
C.
Sheet 5
Display Position and Size:
1. Horizontal size too large or too small (vertical normal) OR
Adjust analog card. If out
Vertical size too large or too small (horizontal normal, Diag 3-8)
of range of adjustment,
change analog card and
card J2.
2. Both horizontal and vertical size too large or too small
If less than 1" in either
direction, adjust analog
card. If more than 1", or
if
display size erratic,
change
3. No space between rows of characters (Model 2 only) (Diag 3·16)
. . . . . ..
HV
power
supply.
Sheet 7
* Requires a formatted buffer.
Symptom Index
3·3
SYMPTOM INDEX (Cont)
Symptom
Diagram Sheet or
Direct Action Repair
1. DISPLAY MALFUNCTIONS (Cont)
C. Display Position and Size: (Cont)
4. Rows of characters not even Iy spaced
5. Display not centered (Diag 3-7)
6. Display tilted (Diag 3-6)
Change analog card
See centering procedure
(5.2.1.5).
See yoke adjustment
procedure (5.2.1.4)
D. Claracters:
1; No characters displayed, but cursor displayed. (See Symptom 2B4 if keyboard
problem·only.) . . • . . . . . . . . . . . . . . • . . . . . . . . . . .
2. Display out of sync. (Characters may be recognizable but are moving, and more
than one cursor is seen. INPUT INHIBITEDnot lighted.) (Diag 3-15)
3. Character(s) not formed correctly wherever displayed on screen
4. Screen full of quote marks (no Device Check) . . . . . . . .
a. Quote mark in location 0 and cursor in location 1 after paR
5. Wrong character displayed from program, keyboard, or paR:
a. Without Device Check
b. With Device Check . . . . . . . . . . . . . . . . .
6. Data displayed that should not . • . . . . . . . . . . .
7. Screen full of one character with or without INPUT INHIBITED lighted
8. Screen slowly fills with character of last keyboard key pressed. INPUT
INHIBITED not lighted
9. Attribute characters displayed
Sheet 7
Sheet 6
Change card K2. *
Change cards A2, K2. *
Replug connector inside
keyboard.
Change card K2. *
Sheet 7
Sheet 8
Sheet 8
Change card A2.
Sheet 8
E. Cursor:
1. No cursor on screen, but rest of display normal (no Device Check) . • . . . .
2. No cursor with INPUT INHIBITED lighted. Cursor cannot be returned to screen
by Power On Reset or CLEAR key
.............•.....
3. Cursorappears normally. INPUT INHIBITED lighted . . . . . . . . ~ . . ~
4. Cursor under all or most character positions, and Device Check. indicated. (I NPUT
INHIBITED lighted) (Diag 3-13)
...................•
5. Cursor under all character positions of one or more lines, but Device Check not
indicated (Diag 3~13) . . . . . . . . . . . . . . . . . . . . . .
6. Cursor not positioned correctly under a character; may be in character area
7. Cursor too long or too short . . . . . . . . . . . . . . . . . . . .
a.No cursor, and INPUT INHIBITED not on. Partial cursor appears as each
character enters until 80 characters in row appear with partial cursor under each
character. Occurs on one row at a time . . . . . . . . . •. . • . . • . .
9. Screen slowlY fills with cursors . . . . . . . . . . . . . . . . . . . . .
10. Cursor appears in three or four rows equally spaced on left side of display after
paR. Characters mayor may not enter and appear at cursor location. Display
may blink . . . . . . '. . . . . . . . . . . . . . . . . . . . . . . .
11. No cursor on screen after paR. Characters may enter, but only first scan line of
each rowdisplaysascharacter enters. (INPUT INHIBITED not lighted)
*If·the Data Analysis - APL Feature is installed, check the +8V deat A-A 1K2U 11.
Change card K2. *
Sheet 9
Sheet 9
Sheet 10
Change card K2. *
Change card K2 ....
Change cardK2. *.
Change card J2.
Change· cards A2, C2, H2~:
Sheet 10
Cl)angecardJ2.
sYmptom
" \"::'.
. " . ,.":.-:':;
Diagram Sheet or
Direct Action Repair
. <. . :. ".: . . .>... ~
'1. DISPLAy MA1.~JNCfi6NS;,(~~tf.";:
F. Indicators:.
1. No indicatprs light.(9tlarac~~sandcorsor normaL)
*2. One indi~a~orfallston9ht,<,.,
............ ' '.' '.'
*3. One indicatorUtWhen ltshouldnotbe ~ .'. .
Sheet 11
Sheet 11
Sheet 9
.Note: If card reader 'fe,atureJsinst~lledOtJ·faJtiflgdisPlay station, remove' card reader
feature logic card at locatl(u':N2,<,8f1drnove.keyboardcablefrom socket Z4 to socket Z1 .
. If keyboard operatescorr~ctIY~i~~,~a~d;r~rn~VecJandcableswapped, change card N2,
. and return keyboard~ble t05OCke~Z4 •• I.f.keyboardstilifaHS with card removed and
cable swapped,.selectsyrrlptorn·thiltbe'Stdescribes failure.
A. All K e y s , ,
1. Keyboardin~~fative
~.~..~.... . ~ . . . . . . . . . . .
2. Keyboard operation erratiC (lNeUTfNHtS1TE.oonafter certain keys.) . . . .
3. DiagOnalrowof~ot~;:a~a~Startil'lga~,fOWer left corner of screen as characters
enter. INPUT INHlf3ITEDnol'lightett '
B. CharaeterKeys:·.•. ·,'.·'., .•. • : . . ' . "
1. Wrong char:~terf()r 9ne~ey
·
2. WrOngCharacterfOfrnoreihaborleker
...•.............
3. Nochara~ters e~t~r.for~ll¥~'.;~,.:. . ...• • . . . . . . . . .' . . .
*3a~ ·Corre~t c~~raeter~flters.~~~~t~r~TIN:~~SrtE9Iightsfor.one or .more keys
4. NO charactef~nter~:for'.U~~y~;'~"ur~3dVat1~switheachkey depression. Dots
mayap~~rOn?f1~li~~,{II\J~~J.'IN~{~IJ7~indi~tor does not light.)
*5. Alpha .cllar~ct~"~).~f)tfjf' jhto~'~~"Prr.eriC;'Pf'*lyOfields. "'(Verify that .. keyboard
numeric .JO~k';feat~rejSin~alf~~'~~'i~.€)-18~)".,.~; •....•.•.. ' .
*6. Numericc~racters cannot e"t~'io/~n~mericOnlyO'fierds
7. Typamatic failures
. . . .. . .
~"curS()rdi~PJl~a,~~:'~b~~~~,~~t.~~:>~.~.,.:.>:. /"
. . .'. .
9"Characters"enier~rl'~::"
•
• . .1
'.'
,
F. Read Modified (MOT bit)·F=ailure:'. '.. ,
.
1. Selector pen. changes designatofctiaractercorrectly, but I NPUT IN HI arTEDlights
2. Selector pen fails to 'set MDT, and INPUT INHIBITED does not light
3. Keyboard fails,to,set MOT . . . • . . . . . . . . . . . . . .
Change card M2, K2.
Change cards A2, C2.
G. Programmed audible alarm failure
Sheet 21
H. Keyboard remains disabled ,after program EiUempt to enable it
Change card G2.
I.
Program
er~se. of unprotedt8d d~taunsuccessful ; erase ,from keYbOaid successful·· . ~
C~~nge~ard{D2.
.
~.
. :::Chal;lge~rd G2:
6. bPERATOR IDENTIFICATION CA"bREADERMALFUNCTIONS
A. Cardscle) not feedthrc>ughrelk1er
,"
.
.
"
,.
...... .
, Sheet,27
~.
'B. Incorrect number of charamets read
,
.
C. Cursor doesnot ,move as car~, feeds through'reader '. . . . . . .
• • , . , • ._.io
•
Sheet 28
* Requires a formatted buffer.
Symptom Index
3-7
See Diagram 2-4 for greater detail of the test pattern data.
Diagram 3-1. Test Pattern 1, Model 1
See Diagram 2-5 for greater detail of the test pattern data.
Diagram 3-3. Test Pattern 2
Model 1 malfunction produces similar results.
(Adjust yoke, 5.2.1.4.)
Diagram 3-5. Yoke Back Too Far on CRT Neck
3-8
See Diagram 2-4 for greater detail of the test pattern data.
Diagram 3':":'2. Test Pattern 1, Model 2
See Diagram '2-6 for greater detail of the test pattern data.
Diagram 3-4. Test Pattern 3
Model 1 malfunction produces similar results.
(Adjust yoke, 5.2.1.4.)
Diagram 3-6. Yoke Tilted
Model 1 malfunction produces similar results.
(Adjust centering rings, 5.2.1.5.)
Diagram 3-7. Centering Rings Not Adjusted Properly
(Troubleshoot on Diag 4-1, Sh 4, 1A2.)
';;~,~6j'tritr
Model 1 malfunction produces similar results.
(Adjust analog card. Model 1, 5.2.1.6,
Model 2,5.2.1.7.)
Diagram 3-8. Character Height Too Small
(Troubleshooton Diag 4-1, Sh 4, 1 B 1.)
r- ,-
Diagram 3-9. Glow Only on CRT
Diagram 3-10. Single Horizontal Line on CRT
(Troubleshoot on Diag 4-1, Sh 5, 1 B2.)
(Troubleshoot on Diag 4-1, Sh 5, 1 B2.)
Diagram 3-11. Modell Raster
Diagram 3-12. Model 2 Raster
Symptom Index
3-9
Model 1 malfunction produces similar results.
(Troubleshoot on Oiag 4·1, Sh 10, 1E4 if
INPUTINHIBI'TED is on. If off change
~rd k2.)
Diagran'l3-13. Cursor in Ellery ~ow
Model 1 malfunction produces similar results.
The densitY of each row is determined by the
number of characters in that row.
.(Troubleshoot on Diag 4·1, Sh 6 102.)
Diagram 3-15. No Horizontal Sync
Model 1 display is same except for size.
Diagram 3-17. Correct Display after POR
3-10
Model 1 malfunction produces similar results.
(Change card J2 if INPUT INHIBITED is on.
Change card K2 if off.)
Diagram 3-14. Box in Every Character Position
This failure applies to Model 2 displays only.
(Troubleshoot on Diag 4-1, Sh 7, 1 C3')
Diagram 3-16. No Interrow Spacing
Model 2 malfunction produces similar results.
(Troubleshoot on Diag 4-1, Sh 5, 1 B5.)
Diagram 3-18. Out of Focus Image
Model 1 malfunction produces shnilar results.
The density of the superimposed characters is
determined by the number of characters in the row.
Modell malfunction prpducessifTIilar.results.
Diagram 3-'20. Open in YokeHoriZOht~fWiridingt
Model 1 malfunction prodU~s sitnHarresults~
The vertical bar appears in every rOw that has data.
Model 1 malfunction produces similar results.
Model 1 malfunction produces similar results.
The pattern displayed is data dependent.
t
ConnectOr Pl
100," on
anal09
Check Pt before changing
Diagram 3-23. Vertical Yoke Open
t
cardcan~"~~~~'~~Pl~m.
YOke.chan~e~~a·lpgCard ifc6nn~ctor
and I or yoke do not repair the problem.
Symptom Index
3-11
Section 4. Troubleshooting Diagrams
The Troubleshooting Diagrams (29 sheets) in this section
should be used as directed by the Symptom Index (Section
3). The diagrams are flowcharts arranged in a sequ~nce that
ensures successful trouble resolution in a minimum time.
The steps in the flowcharts must be followed in sequence
because successive steps depend on the actions and results
obtained in preceding steps. Although the sequence may
seem illogical and shortcuts may seem apparent, deviation is
discouraged to avoid unnecessary duplication of effort and
prolonged service calls.
Sheet 1 determines whether the symptom experienced is
caused by a display station problem or by a control unit
problem. Subsequent flowcharts cover display, keyboard,
selector pen, and card reader malfunctions. Additional
sheets analyze power troubles and miscellaneous keyboard
assembly electrical and mechanical troubles.
Observe good safety habits while working on the display
station with power on. High voltage is present at the CRT
anode, the yoke assembly, the HV power supply, and the
voltage distribution points. Always remove power from the
display station when removing or replacing logic cards. This
avoids damaging circuitry on that card or other cards
feeding it.
The flowcharts use the terms "replace card XX" and
"change card XX". "Replace" means to reinstall the same
card that was earlier removed; "change" means to install a
new card from stock. The old card being changed is the
probable cause of the failure.
Two unique symbols are used in the flowcharts. The
symbol
4. Green Blink - solid red with one (and only one) green
blink.
5. Pulsing Red - solid green with regular red pulses. (Any
frequency of pulses as long as green indicator appears to
stay on.)
6. Pulsing Green - solid red with regular green pulses. (Any
frequency of pulses as long as red indicator appears to
stay on.)
7. Red and Green - approximately equal red and green
pulses (any frequency).
The same conditions can be observed using the new G LP
(General Logic Probe), PN 453212. The difference from the
older-style logic probe is that the G LP uses UP in place of
red to indicate a plus level and DOWN in place of green to
indicate a minus level. This difference must be kept in mind
when troubleshooting with the GLP because the flowcharts
in this manual were designed for use with the older-style
logic probe.
The card-shaped symbol
appearing at the end of a diagnostic sequence gives the
location of the card(s) to be replaced that will repair the
problem. It also means to take the following action:
1. Turn power off.
means to probe (with the logic probe) the point designated
in the symbol. Seven logic probe conditions can be seen
with the older style probe (PN 453652). An output line
from the probe symbol specifies one of the seven conditions. If the observed condition is the same as that
specified in the flowchart, continue down that part of the
flowchart. If the observed result is different from the
specified result, use the part of the flowchart labeled
"Other". The seven logic probe observations specified in
the flowcharts and their definitions are as follows:
1. Red - solid red.
2. Green - solid green.
3. Red Blink - solid green with one (and only one) red
blink.
2.
3.
4.
5.
6.
Change card (s).
Turn power on.
Verify that trouble is repaired.
Replace covers.
Return display station to user.
When more than one card is listed in the symbol, isolate
the failing card by card-swapping from among those
specified. Change the failing card, and retwrn the others to
stock. If changing the specified cards does not repair the
problem, check all voltages on the A 1 board backpanel at
these card locations. Use Diagram 6-19 to identify the
voltages and voltage pins.
The flowcharts call out certain check, adjustment, and
removal procedures. Because of their length and their
utility as standalone procedures, they are contained in
Section 5. Flowchart references to these procedures appear
as three- or four-digit numbers, indicating the paragraphs in
Section 5 where the procedures are found.
Troubleshooting Diagrams
4-1
Check that all basic cards are installed and seated
properly before beginning the troubleshooting procedure.
Basic cards for Model 1 display stations areC-E and G-K.
Model 2 basic cards are C-K. Applicable feature cards
should also be installed and seated properly. Diagram 6-17
shows .logic board card plugging for display stations with no
4-2
features (1/2 board); Diagram 6-18 shows card plugging for
display stations that have features installed (2/3 board).
The logic probe is used extensively in th is section to
isolate failing cards. Ensure that the logic probe is operating
correctly before troubleshooting. Use the procedure in
paragraph 2.1.3.3 to check out the probe.
Display station
trouble reported.
---~....,;I"",.---
Example af some operations that do
not require CU:
1. CLEAR key does not clear buffer
to Nulls.
2. Cursor posi tioning keys.
3. Image quality.
4. Ima!,!e size.
Trouble is probably in
display station. If further
verification is required to
prove trouble is in display
station, perform operotions
described at left.
Assume that trouble is in
display station. Use
Sympton Index a~d
Troubleshooting Diagrams
to resolve problem.
Original failure was
praboblya loose coaxial
cable connection or an
intermittent problem
that cannot be resolved
at this time.
Diagram 4·1. Displav Station Troubleshooting Diagram (Sheet 1 of 29)
Troubleshooting Diagrams (7175) 4-3
1A1
•
Primary power cord
plugged in.
Power switch turned
on (Pull).
Turn Brightness control
to maximum (full
clockwise) .
•
•
Yes
•
•
Turn power off.
Open side covers
(5.3.1).
Check for loose or
poor connector at
A-A1Z3.
Check for loose
connector On analog
cord.
•
•
• Turn power off.
• Remove feature cord (s).
A2, B2, M2, Nc.
• Turn power on.
•
•
•
Sheet 4
•
•
•
•
Turn Bri g htness contro I
to minimum (fully
counterclockwise) •
Press and hold INTEN
CRT switch.
Turn Brightness control
toward maximum.
•
•
Compare display with
Diags 3-19 to 3-23.
'. Release INTEN CRT
switch.
•
Turn power off.
Replace feature card(s)
A2, B2, M2, N2.
Change onalog cord
(Mod 1, 5.3.3.3;
Mod 2, 5.3.3.4).
Power on and adjust
(5.2.1).
Yes
Turn power off.
Remove J2U10.
• Tur'npoweroff.
• Change yoke (5.3.3.2).
• Adjust (5.2.1).
Yes
•
•
•
•
•
Turn power off.
Change analog cord
(Mod 1, 5.3.3.3;
Mod 2, 5.3.3.4).
Power on and adjust
(5.2.1).
•
•
Sheet 4
Diagram 4-1. Display Station Troubleshooting Diagrams (Sheet 2 of 29)
4-4
Turn power off.
Replace feature cord (s)
A2, B2', M2, N2.
Change analog cord
(Mod 1, 5.3.3.3
Mod 2, 5.3.3.4).
Power on and adjust
(5.2.1).;.
•
•
Replace feature cord (s)
A2, B2, M2, N2.
Use check procedure
(5.1.2) to verify all
functions are normal.
Sheet 3
Sheet 2
Yes
•
•
•
Change fuse.
Turn power on.
•
•
Remove CRT socket and
cone shield (5.3.3.2).
Connect CRT socket.
Turn power on.
No
Sheet 4
•
•
Turn power 'off.
Remove CRT socket and
cone shield (5.3.3.2).
Connect CRT
socket.
Turn power on.
•
•
No
Yes
Check cables from PC
board to C/TB 1 and
from PC board to
ferro transformer.
•
•
•
Turn power off.
Remove CRT socket.
Measure resistance
between CRT
pins 1 and 14.
•
•
•
Turn power off.
Remove CRT socket.
Measure resistance
between CRT
pins 1 arid 14.
Yes
•
•
•
•
Turn power off.
Replace cone shield.
Change analog card
(Mod I, 5.3.3.3;
Mod 2, 5.3.3.4).
Power on and adjust
(5.2.1).
No
•
•
Repoir fault.
Check out
unit for proper
operation.
Chonge voltoge
distribution' board
(Diag, 7-6).
Change ferro transformer
(Mod I, 5.3.2.6,
5.3.2.7;
Mod 2,5.3.2.8,
5.3.2.9).
Check cabl es and
CRT socket for loose
or broken fonnections.
Diagram 4-1. Display Station Troubleshooting Diagrams (Sheet 3 of 29)
Troubleshooting Diagrams
4-5
Sh~et
2
Sheet 2
• Turn power off.
• Remove right side
cover.
• Remove feature cord(s)
A2, B2, M2, N2.
• Turn power on.
Meos'-lre following
voltage at HVPS (OIB/
PS2) referenced to de
return, (Diag 7~ 14).
Remove push-on connector
from supply pin 3 (UY) and
lmeosure voltage at
' connector on wire.
• Change analog cord.
(Mod 1, 5.3.3.3
Mod 2,5.3.3.4) .
• Power on and adjust'"
(5.2.1\.
Yes
• T'-Irn power off.
• Replace feature card(s)
Nt, B2, M2, N2.
• Change analog cord
(Mod 1, 5.3.3.3
Mod 2,5.3.3.4)
• Power on lind O(ljus t
(5.2.1).
Measure follllwing
voltages with YOM on
15V scale. R~ference
negative lead to !Ie
return.
Measure voltage on
voltage distribution
board terminal 11.
(Diag 7-11\
Measure. voltage. on
arc~uppression board
terminal E8. (Diag
7-15)
Sheet 3
Diagram 4·1. Display Station Troubleshooting Diagrams (Sheet 4 of 29)
4--6
• Remove left cover.
• Adjust·focus using Focus
control qn HVpower'
supply 5; 2. 1. 3).
• Turn power off.
• Change analog card
Mod 1, 5.3.3.3
Mod 2, 5.3.3.4
• Power on and adjust
(5.2.1).
Check voltage at HV
power supply pin L
Check whil~ adjusting
Focus. potent iometer.
(Diag 7-14)
• Turn power off .
• Change HV power supply
(5.3.2.10).
• Verify fix.
Yes
Check voltage at B/A 1 P3-2
while turning Brightness
control from maximum to
minimum. (Diag 7-12)
• Turn
clockwise.
• Turn contrast maximum
countercl ockwise.
• Adjust focus using focus
control on HV power
.5.2.1.3.
• Turn power off.
• Change control
(5.3.3.5).
• Verify repair.
• Turn power off •
• Model 1 - Change
suppression board.
• Model 2 - Change
distribution board.
• Verify repair.
arc(Diag 7-3).
voltage
(Diag 7-6).
• Turn power off.
• Change control
(5.3.3.6).
• Verify repair.
• Turn power off.
• Change analog card
(Mod 1, 5.3.3.3.
Mod 2, 5.3.3.4)
• Power on and adjust
(5.2.1).
Diagram 4·1. Display Station Troubleshooting Diagrams (Sheet 5 of 29)
Troubleshooting Diagrams
4-7
• Turn power off.
• Remove right side cover.
• Remove feature card{s)
A2, B2, M2, N2.
• Turn power on.
• Turn power off.
• Open right side cover.
• Remove feature card{s)
(A2, B2, M2, N2).
• Turn power off .
• Change analog cord
(Mod 1,5.3.3.3
Mod 2, 5.3.3.4)
• Power on and adjust
(5.2.1).
Red and Green
On the Low Voltage PC
Boord:
• Check for good solder
connections on -12V dc
pins. This can be done
by wiggl ing the socket
while observing the
pins.
.
• Loosen all capacitor
screws and tighten
again.
• Check low voltages.
PC Boord 5.1. 3.1
Sheet 8
No
• Turn power off.
• Change analog cord
(Mod 1, 5.3.3.3)
(Mod 2,5.3.3.4)
• Power on and adjust
(5.2.1).
Diagram 4-1. Display Station Troubleshooting Diagrams (Sheet 6 of 29)
4-8
Sheet 23
• Turn power off.
• Remove front cover.
• Disconnect signal cable
from control unit.
• Turn power on.
• Remove right side
cover.
• Remove front cover.
• Disconnect control unit
cable.
Green
• Turn power off.
• Change analog card
(Mad 1,5.3.3.3
Mod 2, 5.3.3.41.
• Power on and adjust
(5.2.1).
Press CLEAR key, then
RESET key.
• Turn power off.
• Repair security keylock,
or change switch
(5.3.7).
Yes
• Perform Test Pattern 1
procedure (5.1.1).
• Check for parity check
after each key.
No
No
Sheet 17
Yes
Sheet 24
* Model 2 only.
Diagram 4-1. Display Station Troubleshooting Diagrams (Sheet 7 of 29)
Troubleshooting Diagrams (7/75) 4-9
Display station features
i ncl ude keyboard' and
card reader with or
without selector
light~pen.
• Move keyboard cabl~
from l4 to ll.
• Replace keyboard
feature cards (A2"B2).
.' Turn.power on.
• Test keyboard
operation$ .
• Turn power off.
• Replace card reader
feature card (N2) •
• Repl ace light-pen
feature card (M2) if
previously removed.
• Move keyboard cable
from lIto l4.
• Turn power off •
• Replace light-pen
feature card (M2).
Dia~ram4~1.DlsplaYStation Troubleshooting Diagram=:; (SheetS of29)
4-10
• Replace keyboard
feature cards (A2,B2) .
.. Turn pOwer on .
• Test keyboard
operatIons.
Yes
• Turn power off.
• Open right side cover.
• Remove feature card(s}
(A2, 82, M2, N2).
Sheet 8
Sheet 10
Probe while turning
power on.
Probe while turning
power on.
* Model
2 only.
Diagram 4-1. Display Station Troubleshooting Diagrams (Sheet 9 of 29)
TrQublest!ooting Diagrams
4-11
Sheets 9, 28
•
•
•
•
Yes
• Disconnect signal cable
from control unit .
• Remove feature card(s)
(A2, B2, M2, N2).
Other
Other
Other
Other
Other
Other
Other
Model 2 Only
Diagram 4-1. Display Station Troubleshooting Diagrams (Sheet 10 of 29)
4-12
Turn power off.
Open front cover.
Disconnect CU cable.
Remove feature card(s)
(A2, B2, M2, N2) .
• Turn power off.
• Remove feoture card(s)
A2, B2, M2, N2.
• Turn power off •
• Remove front cover.
• Disconnect signal cable
from control unit.
• Turn power on.
Yes
Yes
• Disconnect signal cable
from control unit.
• Press CLEAR, RESET,
ond INS MODE keys
in sequence.
• Display station must be
attached to an active
Other
• Turn power off.
• Repair cable or change
security keylock switch
(5.3.7).
• Verif fix.
Diagram 4-1. Display Station Troubleshooting Diagrams (Sheet 11 of 29)
Troubleshooting Diagrams
4-13
• Remove right side cover.
Disconnect CU cable.
Press RESET key.
Press Space bar.
···
Probe while alternately
pressing a character key
and RESET key.
2A2 - 2B2 Code Chart
Probe
B2S05
B2508
B2S09
B2S02
B2U05
B2Ml0
B2U09
B2Mll
B2S13
K2Gl0
1
G
R
G
G
G
G
G
G
G
2
G
R
R
R
R
R
R
R
G
3
R
4
G
R
R
R
R
R
R
5
R
G
R
G
G
I
Probe pins
listed in
Yes
Sheet 21
Diagram 4-1. Display Station Troubleshooting Diagrams (Sheet 12 of 29)
4·14
Probe while prllssing
a ch arocter key.
Other
Red and
Green
Sheet 21
Diagram 4-1. Display Station Troubleshooting Diagrams (Sheet 13 of 29)
Troubleshooting Diagrams
4-15
Sheet 18
K
Probe while pressing
a character key.
No
Yes
Sheet 9
Press ....-key briefly.
No
Yes
Sheet 9
Yes
No
_......,.."..L,......---.- - - - __ i.-..........;...;_ _ _ _ _....
Pulsing Green
Other
Sheet .21
Probe while holding
key pressed.
Sheet 21
Diagram 4-1. Display Station Troubleshooting Diagrams (Sheet 14 of 29)
4-16
Sheet 14
No
Ves
Probe while holding
key pm$8d.
No
Sheet 21 I Probe while holding
key
pressed.
- ........
.,.;,.,0.
_ _ _ _........
_ _ _......_ . . , - - - -
Other
No
•
•
•
•
See: Mod 1, Diag 3-1
Mod 2, Diag 3-2
Connect CU cable.
Load Test Pattern 1.
Disconnect CU cable.
Press RESET.
No
cursor up one row •
• Press -..j key
briefly.
Probe while holding
key pressed.
+
M
Sheet 16
Sheet 21
Diagram 4-1. Display Station Troubleshooting Diagrams (Sheet 15 of 29)
Troubleshooting Diagra~$
4-17
Sheet 15
No
Probe while holding
key pressed.
--l
Pulsing
J-.~-------~ Green
Sheet 21
Sheet 17
Probe while holding _
key pressed.
Red and Green
Sheet 19
Either trouble disappeared,
or buffer was fully
protected when trouble
reported.
Diagram 4-1. Display Station Troubleshooting Diagrams (Sheet 16 of 29)
4-18
Sheet 7
Sheet 16
No
Sheet 21
Diagram 4-1. Display Station Troubleshooting Diagrams (Sheet 17 of 29)
TrQuble$hooting Diagrams
4-19
Sheet 11
Sheet 14
Sheet 14
No
Probe while holding
ERASE INPUT key
pressed.
I Probe while holding
ERASE EOF key pressed.
Probe while liolding
ERASE EOF key pressed.
Sheet 21
Diagram 4-1. Display Station Troubleshooting Diagrams (Sheet 18 of 29)
4-20
Sheet 16
Probe while pressing
RESET key.
Probe while. holding _
key pressed. ,
Sheet 21
Diagram 4·1. Display Station Troubleshooting Diagrams (Sheet 19 of 29)
Troubleshooting Diagrams
4-21
Sheet 26
No
Prob ... while pressing
failing key.
Change defective
keybutton (5.3.5.5).
No
Red Blink
lEach tirne
alphanumeric
key pressed --~==::11-~
and character
enters),
No
~---'-----,
-
- Green
- Blink
--
Probe while pressing
CLEAR key.
.....--------....
Other
Sheet 9
Probe while pressing
CLEAR key.
Diagram 4-1. Display Station Troubleshooting Diagrams (Sheet 20 c)f 29)
~22
Sheets 12 through 20
See paragraph 5. 1. 4 for
description of Type A
and B keyboards.
No
Check cabl e and cannecti on between keyboard
and display station.
No
No
• Type AChange keyboard
assembly (5.3.5.3) •
• Type BChange circuit
board (5.3.5.11).
Probe while entering
character in next-tolast position.
No
Other
Yes
Yes
I • ~r~~o~~s~~:~:;:t~:~d
I (5.3.5.1).
I. Remove top cover
No
I (5.3.5.2).
I. ~::::,~~~:~ard
I bottom pan (5.3.5.3).
Change keyboard
assembly (5.3.5.3).
Diagram 4-1. Display Station Troubleshooting Diagrams (Sheet 21 of 29)
Troubleshooting Diagrams
4-23
Probe while h61ding tip
switch closed.
Other
Diagram 4-1. Display Statiol1 Troubleshooting Diagrams (Sheet 22 of 29)
4-24
Sheet 2
• Model I-Remove left
side cover.,
• Model 2-Remove front
cover.
No
Yes
• urn power off.
• Disconnect power
connector C/Al P3 at
aMlog cord.
• Turn power on.
• Unplug line cord from
power source.
• Pull OFF-PULL switch.
• Set ohmmeter on Xl
• Turn power off.
• Change analog card.
(Mod 1, 5.3.3.3
Mod 2, 5.3.3.4)
• Power on and adj ust.
(5.~.1)
• Chonge, in followirtg
order:
1. PC board
(5.3.2.1).
2. AC capacitor
(5.3.2.3).
3. Ferro' transformer
(Mod 1, 5.3.2.6,
5.3.2.7)
Mod 2, 5.3.2.8)
5.3.2.9)
• Check for repoir ofter
e'och unitinstolled.
No
• Turn power
• Remov.e plugs P2
and P4 from prime
power'box.
• Change fuse Fl.
• Turn power on;
connector P2 on bdck
of primary power box.
• Measure resistance
across pins of plug
removed.
• Ohmmeter on Xl
, No
Yes
Yes
Change ferro t~ansformer
(Mod 1,5.3.2.6,
5.3.2.7
Mod 2, 5.3.2.8
• Check prime power box and connectors.
• Change prime powerbox
(Mod 1, 5.3.2.4
Mod 2,5.3.2.5) if no shorts are ev.ident.
• Change fuse Fl.
• Recon
all connectors.
• Turn power off.
• Reconnect plug P4.
• Remove pi ug PI from
PC board.
• Change fuse Fl.
• Turn power on.
Sheet 25
Change line cord.
• Check cord reader and
connectors.
• Change cord reader if
no shorts ore evident.
• Reconnect all connectors.
Do the following steps in
order and check for repair
after each step.
• Change AC capocitor
(5.3.2.3).
• Change ferro transformer
(Mod 1, 5.3.2.6,
5.3.2.7
Mod 2, 5.3.2.8,
5.3.2.9).
• Change fuse F1.
• Reconnect all connectors.
Diagram 4-1. Display Station Troubleshooting Diagrams (Sheet 23 of 29)
Troubleshooting Diagrams
4-25
Sheet 23
• For Model I, refer to
logic YA011,
PN 2577870.
• For Model II, refer to
logic YAOl1,
PN 2564997.
• With power off, use an
ohmmeter and the referenced voltage distribution logic to determine
which FRU caused the
fuse to blow.
No
~Sheet 29
Yes
• Remove regulotor card.
• Chonge fuse.
• Turn power on for 10
sec, then off .
• Check F3 ogoin.
If unit is operational,
return to customer, if
not, determine new
symptom.
Chonge ferro tronsformer
(Mod 1, 5.3.2.6,
5.3.2.7)
(Mod 2, 5.3.2.8,
5.3.2.9)
Change ferro transformer
(Mod 1, 5.3.2.6,
5.3.2.7)
'(Mod 2,5.3.2.8,
5.3.2.9)
Yes
Change regulator card
(5.3.2.2).
Use wiring diogram YA011
to locote short in:
• Wiring
• Logic board
• Logic card(s)
• Analog cord
• Keyboard
• Card reader
After repoir, install
regulator card.
Diagram 4·1. Display Station Troubleshooting Diagrams (Sheet 24 of 29)
4-26
Sheet 23
•
•
•
•
•
•
Turn power off.
Reconnect plug Pl from PC board.
Remove plug P3 from analog card.
Change fuse.
Turn power on for about 1 minute,
then off.
Check fuse Fl in primary power box.
No
•
•
•
•
•
Replace plug P3 on onalag card.
Remove lines supplying +5, +8, +34,
and -12 to logic gate. (See FEALD
log i c poge YAO 11 for connectOrs. )
DO NOT remove plug P2 from
low-voltage PC board.
Chonge fuse.
Turn power on for about 1 minute,
then off.
•
•
•
Replace plug P3 on analog card.
Remove push-on connector to
pin 5 of HV power supply (+34V).
Turn power on for about 1 minute,
then off.
Yes
•
•
Use wiring diagrom
YAOll to locate short
in wiring to logic
gate, or isolate to
logic card(s) by
removing all cards
from gate.
If not in wiring or
cards, change
logic board.
No
Change PC
board (5.3.2.1)
•
•
•
Change analog card.
(Mod 1, 5.3.3.3
Mod 2, 5.3.3.4)
Reploce push-on connector
to pin 5 HV power supply.
Power on and adjust.
(5.2.1)
Diagram 4-1. Display Station Troubleshooting Diagrams (Sheet 25 of 29)
Troubleshooting Diagrams
4-27
• Verify all offline
functions are correct .
• Swap coaxial signal
cable with known
good device.
Yes
Yes
Check coaxial cable from
input connector to board.
Diagram 4-1. Display Station Troubleshooting Diagrams (Sheet 26 of 29)
4-28
• Press RESET, CLEAR,
and RESET keys.
• Feed test card into
No
• Reseat connector.
• Check cord reoder
operations.
• Return to customer.
Pins for next check are
identified by numbers on
reader cable plug
assembly.
(50Hz)
Measure reader motor
resistance between pins
A 1 and A2 of reader
cable plug for
approximately 400 ohms.
No
Measure reader motor
resistance between pins
10 and 24 of reader
cable plug for
approximately 400 ohms.
Refer to 10R-M
10 Read~rized
Theory-Ma i ntenanceParts Catalog.
Yes
Check display station
power cabling from card
reader connector to ferro
transformer.
Refer to 10R-M
10 Reade-;::Mot"orized
Theory-Mei nte nanceParts Catalog.
Diagram 4·1. Display Station Troubleshooting Diagrams (Sheet 27 of 29)
Troubleshooting Diagrams
4·29
Sheet 27
Yes
No
operotions •
• Return to customer.
•
No
• Insert card correctly.
• Test card reader
operations.
• Return to customer.
• Press RESET, CLEAR,
and RESET keys.
• Test card reader
operations.
Disconnect reader cable
fram 01A-N2D02, B03,
and DOa.
• Set YOM on +5V dc
scale.
• Connect minus (-) lead
on wire formerly
attached to N2DOa •
• Check the two signal
wires for approximately
+2V de as test card
exits reader.
No
Return to customer.
Cursor was in a
protected field or
under an attribute
character.
Check cable ground at
OlA-N2DOa.
No
• Connect signal and
ground wires correctly.
• Test card reader
operations •
• Return to customer.
Diagram 4-1. Display Station Troubleshooting Diagrams (Sheet 28 of 29)
4-30
Refer to I DR-M
ID Reader-Motorized
Theory-Ma i ntenanceParts Catal09.
Return to
customer.
Change in following
order:
1. lVPC Board
(5.3.2.1)
2. Ferro transformer
(5.3.2.6/5.3.2.9)
Check for repair after
each step.
Turn power off.
Remove +34 V Fuse.
Measure resistance
between
A/F2-B Mod 1 or
01C/F2-B Mod 2
With ohmmeter still
connected, remove
cards in 01A/Al and
the keyboard connector in
01A/Al 21124 one at
a time until short is
isolated to card, connector
or board.
No
Check in following
Remove ohmmeter.
Turn power on
for 30 sec, then
turn power off. Check
34 V fuse again.
Change in following
order:
1. Analogeard
2. HV power supply
Check for repair after
each replacement.
order:
1. 01A/A1M2card.
2. 34V wiring from
fuse to board. See
logic page Y AO 11 for
wIre routing.
3. 34 V entry on board
at 01A/A 1 K6B04.
Check and repair
34 V wiri ng from
l V power supply
circuit board to
fuse holder. See
logic page Y A011
for wire routing.
Diagram 4-1. Display Station Troubleshooting Diagrams (Sheet 29 of 29)
Troubleshooting Diagrams
4-31
Section 5. Checks, Adjustments, and Removals
This section contains all alignment, adjustment, and
removal procedures necesspry to maintain IBM 3277
Display Stations. It also contains service checks and
checkout procedures to determine whether adjustments are
required and to verify the accuracy of any adjustments
made.
5.1
5.1.1
CHECKS
Display Station Test Using Test Pattern 1
A comprehensive test of the display station and all attached
features is performed by using diagnostic Test Pattern 1 and
the procedures described in the following paragraphs. The
step-by-step procedures describe the sequence in which the
various operations should be performed and the results
expected of each operation.
The tests should be performed in the sequence
presented, because each test is dependent on data left on
the screen from preceding tests. The observations described
in paragraph 5.1.1.1 apply to all display stations. Further
testing depends on what features are attached to the display
station.
If a problem is discovered while performing this operational test, refer to the Symptom I ndex or the Troubleshooting Diagrams to resolve the problem.
Note: Test Pattern 1 is not available for 3277 Display
Stations attached to a 3274 Control Unit. Therefore, paragraphs 5.1.1.1 through 5.1.1.5 do not apply to these 3277s.
Go to paragraph 5.1.2 for Display Station Operational
Test (without Test Pattern 1).
Refer to Appendix A for offline procedures to test the
selector light pen on 3277s attached to a 3274.
5.1.1.1 Initialization and Observations
1. Load Test Pattern 1 on display station being checked.
(See paragraph 2.2.1 for instructions for loading Test
Pattern 1.) SYSTEM AVAILABLE is the only indicator
that should be on after pattern is loaded.
2. Take display station offline by removing control unit
signal cable. Jack is located at front of display station,
under front cover. Do not turn power off while
removing cable or Test Pattern 1 will be lost.
3. Compare image on screen with expected image shown in
Diagram 2-4. The "NON DISPLAY" field should be
blank. Top two rows are displayed in normal intensity,
next two rows are displayed in high intensity, and half
of last row is displayed in high intensity.
4. Check for only one cursor. Cursor should be in first
character position of second row of displayed data.
5. Check quality of displayed image. Image should not be
tilted or blurred, and characters should be formed
properly with correct inter-row ~pacing.
6. Vary Brightness control. Set it where high intensity
characters have proper brightness.
7. Vary Contrast control. Set it where normal intensity
characters contrast with high intensity characters at
desired level.
5.1.1.2 Security Keylock Test (Optional Feature)
1. Turn security key off (vertical position). All data should
disappear from screen, INPUT INHIBITED indicator
should light, and cursor should remain displayed.
2. Turn security key on. Original data should reappear on
screen, and INPUT INHIBITED indicator should go out.
5. 1. 1.3 Tests from Keyboard (Optional Feature)
Press the RESET key. The display image should appear as
shown in Diagram 2-4, with the cursor located under the
character C in the second row of displayed data. No
indicators should be on.
1. Key in the row of alphabetic characters and the one
space exactly as they appear in the row above. All
characters shou Id enter correctly, and cu rsor shou Id
move under I after Space bar is pressed.
2. Move cursor under C of CK in second row of displayed
data, using ~ (Right) key.
3. Press INS MODE key. INSERT MODE indicator should
light.
4. Press A key. Field should now appear AQ,K.
5. Press FIELD MARK key. (Use B key on Operator
Console keyboard.) Field should now appear A; gK
(AB£K).
6. Press C key. The data should not change, but the
INPUT INHIBITEQ indicator should come on (in
addition to the INSERT MODE indicator, which has
remained on.)
7. Press RESET key. Both indicators should go out.
8. Press DEL key. The C should disappear, and the field
should now appear A;.!S (AB.!S).
9. Press ~ key (New Line). Cursor should move under C
character in fourth row of displayed data.
10. Enter the special characters as they appear in the row
above, shifting where required. Cursor should appear
under 0 character after last special character enters.
11. Enter the digits 0 through 9 and the characters, . - and
A as they appear in the row above. (On Data Entry
keyboards, use the , over * and . over $ keys to enter
the , and . characters.) The following results should
occur:
a. Typewriter and Operator Console keyboards without numeric lock feature - all characters should
enter.
Checks, Adjustments, and Removals
5-1
b.
Data Entry keyboard without numeric lock
feature - characters, . and - enter normally; the A
character enters as symbol.
c. All keyboards with numeric lock feature - characters . and - enter normally; keyboard should
lock and INPUT INHIBITED should light when,
and A keys are pressed. (Use Reset and -+ keys to
move cursor from those positions.)
(Down), and +- (Backspace) cursor
12. Check t (Up),
move keys for proper operation.
13. Check the Typamatic function of the Space bar or any
other key with Typamatic capability. Use the first field
in the fourth row of displayed data for this step.
14. Move cursor under first character displayed of test
message.
<
+
15. Press any alphameric key. INPUT INHIBITED indicator should come on, and character shou Id not enter or
display because field is designated as a protected data
field.
16. Press RESET key. INPUT INHIBITED indicator should
go out.
17. Press ENTER key. INPUT INHIBITED indicator
should light, and keyboard should lock.
18. Press RESET key. INPUT INHIBITED indicator should
go out, and keyboard should unlock.
Note: The following steps check tab, DUP, and new
line functions.
19. Press ~ (Tab) key. Cursor should appear under
character A in second row of characters.
20. Press DUP key. An asterisk (*) should appear in cursor
position, and cursor should move under I of INSERT.
(On Operator Console keyboard, use Tab key; cursor
should move under I of INSERT, but the asterisk
should not appear.)
21. Space one character position. The I should disappear.
22. Press I+- (Backtab) key. Cursor should move back one
space to where the I was formerly located.
23. Press Tab key. (Use SKIP key on Data Entry keyboards.) The cursor should appear in the first character
position of the fourth row of displayed data.
Note: The following steps test the erase and clear
functions.
24. Position cursor under character E in second row of
displayed data.
25. Press ERASE EOF key. Characters E through Z should
disappear, and cursor should not move.
26. Press ERASE INPUT key. All unprotected data,
including keyed-in characters and field that originally
appeared as INSERT CK, should disappear from screen.
27. Proceed to paragraph 5.1.1.4 if display station being
tested has a selector light-pen attached. If a pen is not
attached, press CLEAR key. All characters remaining
on screen should disappear, and cursor should reappear
in first character position in first row. Press RESET
key.
5-2
28. Proceed to paragraph 5.1.1.5 if display station has an
operator identification card reader attached. I f a card
reader is not attached, test is completed. Turn power
off, and reconnect control unit signal cable.
5.1.1.4
Selector Light-Pen Tests (Optional Feature)
Note: Refer to Appendix A for selector light-pen tests for
3277 Display Stations attached to a 3274 Control Unit.
I
1. Fire pen on detectable field that has a question mark (?)
as its first character. Question mark should change to a
greater-than (» symbol. Remainder of field should not
change.
2. Fire pen again on the field. The greater-than symbol
should change back to a question mark. Remainder of
field should not change.
3. Fire pen on next detectable field that has a greater-than
symbol as its first character. The greater-than symbol
should change to a question mark. Remainder of field
should not change.
4. Fire pen again on same field. Question mark should
change back to a greater-than symbol. Remainder of
field should not change.
5. Press CLEAR key. All characters on screen should
disappear, and cursor should move to character location
O. Press RESET key.
6. Proceed to paragraph 5.1.1.5 if display station being
tested has an operator identification card reader
attached. If a card reader is not attached, test is
completed. Turn power off, and reconnect control unit
signal cable.
5.1.1.5 Operator Identification
(Optional Feature)
Card
Reader
Tests
1. Key in a few characters on the screen.
2. Return cursor to character position 1. (Do not use
CLEAR key.)
3. Read in card reader test card (PN 2143816). The
following events should occur:
a. Keyed-in data disappears from screen.
b. Cursor moves 40 character positions.
c. INPUT INHIBITED indicator comes on and stays on.
If cursor does not move 40 spaces, read-in operation was
u nsuccessfu I.
4. Tests are now completed. Turn power off, and reconnect
control unit signal cable.
5.1.2 Display Station Operational Test (without Test
Pattern 1)
The following test sequence is a quick checkout procedure
that can be used as an offline display station reliability test.
This procedure tests display station circuitry extensively,
but is not as comprehensive as the procedure described in
paragraph 5.1.1. It can be used as a qu ick checkout to
verify correct operation after maintenance is performed.
Perform the steps in sequence for most effective results.
1. Turn power off.
2. Take display station offline by removing coaxial signal
cable from display station I/O jack. Jack is located at
front of display station. Front cover must be removed
for access to it.
3. Turn power on. Within 15 seconds, cursor should
appear on screen at character location O. No indicators
should be lighted.
4. Press -+ (Right) key, and hold it down. CursOr should
move through' each character location 'in the row. After
reaching last character location, cursor should appear
in first character location in second row.
5. Exercise t (Up),
(Down), +I (New Line), and +(Left) cursor move keys. Observe that each key
performs its operation correctly.
6. Press several alphameric keys in succession. The corresponding characters should display, and cursor should
move one space as each new character appears.
7. Key in a complete row of characters. When last
character of row enters, cursor should appear in first
character position of next row.
8. Press an alphameric key. Character should appear in
cursor location, and cursor should advance one space.
9. Exercise both upper and lower shift of all keys. If the
3270 Data Analysis - APL Feature is installed, exercise
upper and lower with APL turned off; then upper,
lower, and alternate shift with APL turned On. Observe
display screen as each key is pressed, checking for
proper operation.
+
10. Exercise Typamatic function of each Typamatic key.
11. Move cursor into last row, and key in several alphameric chararacters.
12. Backspace cursor near middle of group of characters
,
just entered. '
13. Press INS'MODE key. INSERT MODE indicator should
light.
14. Press Space bar enough times to cause characters at
right of cursor to move to end of row and wrap around
to first row.
15. Press RESET key. INSERT MODE indicator should go
out.
16. Delete several characters using DE L key. Character in
cursor position should disappear, and characters in
same row at right of cursor shou Id move left one
character position each time DE Lis pressed.
17. Move cursor to middle of a row of characters.
1a.Press ERASE EOF key; Characters from cursor position throu'gh last position on screen' should erase, and
cursor should not move.
19. Press ERASE INPUT key. All characters should erase,
and cursor should move to location O.
20. Enter several alphameric characters as in step 6.
21. If display' station has the security key lock feature, turn
key off. Characters should disappear from screen,
INPUT INHI BITED should light, and cursor should
remain displayed.
22. Turn security key on. Original data, should reappear on
screen, and INPUT INHIBITED should go out.
23. Press CLEAR key, then RESET key. All characters
should disappear from screen, and cursor should
reappear in character location O.
24. Press Backspace key two times.
25. Press any character key. Audible alarm (feature) should
sound when key is pressed if feature is installed.
26. If an operator identification card reader is attached,
proceed to step 27. Turn power off, and reconnect'
control unit signal cable if a card reader is not attached.
27. Press CLEAR key, RESET key, then enter several
alphameriC characters as in step 6.
28. Return cursor to location 0 using ~ (Left) key.
29. Read in card reader test card ,(PN 2143816).
30. Observe that INPUT INHIBITED indicator comes on,
cursor moves 40 spaces, and keyed-in data disappears
from screen as card passes through reader.
31. If cursor does not move 40 spaces, read-in operation
was unsuccessful.
32. Offline tests' are completed. Turn power off, and
reconnect control unit signal cable.
5.1.3 Voltage Checks
A ferroresonant transformer (ferro) with a 11 dv ac primary
and multiple secondary taps provides all display station
voltages. (World Trade Corporation display stations use a
ferro with a tapped primary winding.) The ferro is
protected by fuse F1 in serles with its primary winding. F1
is located in the prime power box. Display station voltages
consist of low de voltages, high dc voltages, and 6.3V ac
CRT filament voltage. These voltages can be checked at the
LV printed circuit (PC) board or at Terminal Board 1
(TB1 ).
Refer to the Symptom Index and Troubleshooting
Diagrams if a voltage is incorrect or is missing.
5.1.3. 1 Low- Voltage DC Checks
Model 1: For +8V and -12V, measu re the low dc voltages at
the capacitor screws on the LV printed circuit board.
Diagram 7-9 shows the location and the polarity of the
capacitor screws. Remove the left side cover for access to
the Circuit board. For +5V and +34V, measure the voltages
at the fuse holders at A/F1-B for +5V and A/F2-B for +34V
(Diagram 1-3).
Model 2: For +8V and -12V, measure the low dc voltages
through .the access holes in the ,shield that covers the
printed circuit board. A line with arrowheads at each end
designates the pairs of terminals associated with each
Voltage. For +5V and +34V, measure thevoltages at the
fuse holders at 01C/F 1-B for +5V and 01C/F2-B for +34V
(Oiagram 7-5). Diagram 7-10 illustrates the PC board shield.
Checks, Adjustments, and Removals
5·3
RemO've the front cO'ver fO'r access to' the circuit bO'ard.
Observe the PO'laritiesof the terminals, and probe with
the cO'rrect test leads to' prevent damage to' the meter. The
fO'IIO'wing vO'ltages can be measured at the PC bO'ard:
+5V ±10% (This vO'ltage is prO'tected by fuse at
A/F1 (MO'del 1) Diagram 7-3 and 01C/F1
(MO'del 2) Diagram 7-5.)
+8V ±12% (This voltage is protected by fuse F2 O'n
PC bO'ard.)
+34V ±10% (This vO'ltage is prO'tected by fuse at
A/F2 (MO'del 1), Diagram 7-3 and 01C/F2
(MO'del 2), Diagram 7-5.)
-18V (This vO'ltage is fuse-protected by fuse F3 O'n
PC bO'ard and is the input to'· the -12V
regulatO'r card. If this vO'ltage is missing, the
-12V will alsO' be missing.)
-12V ±4%
5.1.3.2 High- Voltage Check
The only high voltage that should be checked is the +400V
dc (which is derived from the HV power supply). If this
voltage is correct, the other high voltages for the CRT
should also be correct. Because the +400V is a low-current
supply, it is impossible to obtain an accurate measurement
with the standard voltmeter. Check the arc-suppression
circuitry whenever HV troubles occur.
1. Turn power off.
2. Set voltmeter selector switch to a position that will
measure up to +400V dc.
3. Connect minus (-) meter lead on any dc return
terminal.
4. Connect plu;s (+) meter lead to HV power supply
terminal 2 (Diagram 7-14) by sliding push-on connector
back slightly.
5. Turn power on.
6. Check for a meter indication of +400V ±50V dc.
(Because this voltage is a low-current supply, it is
impossible to measure the +400V dc operating voltage
with the IBM meter; therefore, the wide range of ±50V
is given.) If voltage is correct, turn power off, remove
test leads from term ina Is, and check the arc-suppression
circuitry (paragraph 5.1.3.3). If voltage is incorrect,
proceed with steps 7 -10.
7. Turn power off.
8. Remove push-on connectors from HV power supply
terminals 1 and 2.
9. Turn power on.
10. Check again for +400V ±50V dc on terminal 2. If
voltage is correct, turn power off, remove test leads
from terminals, reconnect power supply push-on connectors, and check the arc-suppression circuitry
(paragraph 5.1.3.3). If voltage is still incorrect, change
the HV power supply (paragraph 5.3.2.10).
.
5.1.3.3 Arc-Suppression Check
A defective arc-suppression circuit may aPPear as a defec5·4
tive HV power supply or analog card. If excessive trouble is
experienced with either of the two assemblies, check the
arc-suppression circuitry as listed below. Arc-suppressiO'n
circuitry is located on the arc-suppression board (Z1,
Diagram 7-15) on Model 1 display statiO'ns and on the
voltage distribution board (TB 1, Diagram 7~ 11) on Model 2
display stations.
Visual Checks:
1. Check for bent, broken, or missing wires.
2 ...Check for bent capacitor leads that are toO' close to
other cO'mponents and cou,ld cause arcing.
3. Check for broken capacitors or other components
showing obvious damage.
Model 1 Resistance Checks:
1. Turn power off.
2. Remove arc-suppression board from its socket.
3. With the CE YOM, check between the fO'llowing pairs of
pins on the· arc-suppression board for the resistances
specified:
E7 and E 13 - ,Infinity
E9and E13 - 1 Megohm
E7 and E 14 - Infinity
E10 and E14 - 1 Megohm
4. Replace. the arc-suppression board if the. resistances are
not correct.
Model 2 Resistance Checks:
1. Turn power off.
2. Disconnect wires from voltage distribution board terminals 12, 13, 14, and 15.
3. With the CE YOM, check between the fO'llowing pairs of
pins on the voltage distribution board for the resistances
specified:
13and 16-lnfinity
12 and 13 - 1 Megohm
14 and 16 - Infinity
14 and 15 - 1 Megohm
4. Replace voltage distribution board if the resistances are
not correct.
If the above checks dO' not reveal an obvious fault in the
arc~suppression Circuit and if excessive trouble persists,
change the 'arc-suppression board (Model 1 ) or the voltage
distribution bO'ard (MO'del 2). Return to Diagram 4-1, sheet
4, if the checks were performed as a result O'f instructions in
the troubleshO'oting diagrams.
5.1.3.4 6.3V AC Check
The CRT filament voltage of6.3V ac. (±10%) is theonly ac
vO'ltage used in the display station. A quick check to
determine if 6.3V ac is present is to' 10O'k fO'r a glowing
filament at the back O'f the CRT neck, near the tube socket.
The CRT cone shield must be removed to see filament (par.
5.3.3.2, steps 1-3). This voltage is protected by fuse F1
IO'cated O'n the LV PC board.
1. Turn·PO'wer O'ff.
2. Set voltmeter selector switch to' a position that will
measure 6.3V ac.
3. Remove fuse Flo (Remove shield for access on Model 2
. display stations.)
4. Connect a meter lead on each end of fuse holder.
5. Turn power on.
6. Check for a meter indication of 6.3V ac.
7. Turn power off, and remove meter leads from fuse
holder.
8. Reinstall fuse and shield (if removed).
While performing the following checks, the keyboard
assembly should be visually inspected for shorts or grounds
that could cause erratic operation or erroneous results.
A faulty keyboard assembly should be replaced with a
good one. A faulty Type A assembly should be returned to
the factory if it is ,less than one year old. The date code is
marked on Type A keyboard assemblies by week (01-52)
and year.
5.1.3.5 High-Voltage Power Supply Check
5. 1.4. 1 Voltages
1. Turn power off.
2. Remove HV power supply leads 3 (UV) and 4 (DC
return). See Diagram 7-14.
3. Set CE VOM selector switch to 'AX1 0 position.
4. Measure resistance between HV power supply pins 3 and
Type A Keyboards (See Diagrams 7-7 and 7-8 for Type ,A
keyboard locations) :
1. Check, for -12V,dc between KBl pinsZ(-) and X
(ground).
2. Check for +8V dc betw~en KB1 pins V(+) and X
(ground).
3. Check for +5V dc across keyboard capacitor C1. This
voltage is developed (by the voltage regulator on the
keyboard assembly) from the display station +8V dc
power supply. Replace the keyboard assembly if the
+8V dc is correct and the +5V dc is nofcorrect.'
4.
5. Reverse meter leads and measure again.
6. Replace HV power supply (par. 5.3.2.10) if readings in
step 4 or 5 indicate a shorted or open condition.
5.1.4 Keyboard Checks
Two different style keyboards may be found on IBM 3277
Display Stations. Both are identical. in operation and vary
only slightly in external appearance. The rows of keys on
Type "A" keyboards have an even slope downward from
top to bottom. The rows of keys on Type liB" keyboards
are slightly concave. The two types can' bedistingu ished
with the 'keyboard coVer removed~y observing the location
and type of cable connection and the location of the +5V
regulator (large transistor on heat sink). The Type A
keyboard cable plugs into the rear edge of the printed
circuit board, and the regulator is located in the left corner
of the circuit board. The Type B keyboard cable plugs into
a 24-pin SL T connector wh ich is mounted in the left corner
of the circuit board, and the regulator is located in the right
corner of the circuit board.
Thefollowingpa'ragraphs contain check procedures
which can be used to isolate keyboard problems. When the
check procedure differs for the different keyboard types (A
and B), the differences are noted. Ensure that the correct
procedure is used. Keyboard problems can be isolated to
one of three possible areas:
1. External to the keyboard.
2. A FRU in the keyboard.
3. The keyboard assembly. (Type' A assembly consists' of
circuit board with key modules; Type B assembly
consists of circuit board and electronics assembly with
key modules in an all-keys assembly.)
Problems external to the keyboard should be diagnosed as
outlined in the Troubleshooting Diagrams. Keyboard FRUs
include key buttons, switch modules, spacebar assembly,
support modules (Type A only), circuit board and electronics assembly (Type B only), and the audible response
device. Do not attempt to repair any other keyboard units.
Type B Keyboards (See Diagram 7-19 for Type B keyboard
locations) :
1. Check for -12V dc b~tween KB1 pin 002 (-) and 008
(ground).
2. Check for +8V dc on one of the voltage regulator
terminals (under the circuit board and electronics
assembly) and +5V dc on the other terminal. Reference
the meter negative (-) lead to test pin 008. Input to the
regulator is +8V dc, and the output is +5V dc. Replace
circuit board and electronics assembly if the +8\1 dc is
correct and. the' +5V dc is incorrect. Check KB1
connector and display station power supply if +8V and
+5V are incorrect.
5.1.4.2 Key Module and Encoding - Type A Keyboards
Only (Diagram 6-19)
Correctly functioning key mod.ules present two active
(2.5V dc minimum) input lines tpthekeyboard assembly
encoder. With two and only two active inputs present, the
encoder generates the strobe signal and, the encoded
character output. This procedure checks that the strobe
signal is generated properly, and the key modules activate
only two inputs to the encoder. Replac~the key module if
it is found to be defective. Replace the keyboard assembly
if the encoder or the printed circuit board is defective.
Strobe check:
1. Set selector switch on volt,ohmmeter to a position that
will accurately measure 5V dc.
2. Place minus (-) meter lead on KB 1 tab X (ground).
3. Place plus (+) meter lead on KB 1 tab R (strobe signal).
4. With no keys pressed, the meter should indicate at least
2.5V. If the meter indicates 0.6V or lower, proceed to
step 7.
Checks, Adjustments, and Removals
5-5
5. PreSs and hold one alphameric key. The meter" should
indicate less than 0.6V. If the meter indicates 2.5V or
higher, replace the keyboard assembly.
6. Press and hold two alphameric keys simultaneously.
The meter should indicate at least 2.5V. Proceed to
paragraph 5.1.4.3 if the preceding resu Its are correct.
O.6V (or lower) with no keys pressed:
7. With meter leads attached as in steps 2 and 3, press two
alphameric keys simultaneously. If meter indicates
0.6V or lower, replace keyboard assembly.
8. Probe KB1 pins 0, E, F, \-I, J, K, L, M, and N (bits 0-7
and Parity, Diagram 7-8) with no keys pressed.
9. Note bit configuration of encoded output. With logic
probe, a red indication is a 1 bit, and a green indication
is a 0 bit. With voltmeter, greater than 2.5V is a 1 bit,
and less th~n 0.6V is a 0 bit.
10. Find code in 0 iagram 6-7 or 6-14 that corresponds to
bit configuration observed in step 9.
11. Check center two lead frame terminals of suspected
module for 2.5V or higher. (Keyboard assembly must
be removed from bottom pan for this voltage check.
See paragraph 5.3.5,3.)
12. Replace defective module if 2.5V or higher is measured
on both center terminals in step 11.
13. If only one terminal measures 2.5V or higher and other
measures 0.6V or less, recheck steps 8 through 11. If
same results are obtained, replace keyboard assembly.
14. Replace keyboard assembly if less than 0.6V is
measured in step 11.
5.1.4.3 Output Codes
Theunshifted and shifted codes for all keys on both types
of keyboards (A or B) can be checked by the following
procedure, which uses the logic probe and Diagram 6-7 or
6-14. (Use Diagram 6-8 if the 3270 Data Analysis - APL
feature is installed.)
1. Press and release desired key. Hold SHIFT (NUMERIC
on data entry keyboards) key down while pressing key if
desired character is on top half of keYbutton. If APL is
installed, hold APL AL T key depressed, in conjunction
with character key, to enter APL alternate shift codes
when APL is active.
2. Probe pins listed below with logic probe, and note bit
configuration observed. A red (UP) indication is a 1 bit,
and a green (DOWN) indication is a 0 bit.
Pin (1A1-B2)
S05
S08
S09
S02
U05
M10
U09
M11
S13
1A1-K2-G10
5-6
Keyboard Bit
0
1
2
3
4
5
6
7
Pa(ity
8 (APL only)
3. Compare bit configuration observed in step 2 with
configuration for desired character shown in 0 iagram
6-7 or 6-14. Use Diagram 6-8 for APL.
5.1.4,4 Shift Key Modules - Type A Keyboards Only
Two SHI FT keys and the shift LOCK key (NUMERIC and
NUM LOCK keys on data entry keyboards) generate an
input signal to the keyboard assembly encoder. The
encoder generates upsh ift character codes of the characters
appearing on the top half of the keyboard keys. The
following procedure isolates a shift module failure.
1. Set volt-ohmmeter selector switch to a position that will
accurately measure up to +5V dc.
2. Place minus (-) meter lead on KB 1 tab X (ground).
3. Check all three shift keys individually for 2.5V
(minimum) on both center leads of the corresponding
key module when each key is pressed and for 0.6V
(maximum) when key is restored.
4. Replace shift module that fails to generate proper levels
on both leads.
5. If shift module generates proper levels, and keyboard
generates incorrectly shifted characters (5.1.4.3), replace
,
keyboard assembly~
5.1.4.5 Spacebar Assembly Mechanical Checks
The spacebar assembly and mountings should. be checked
for easy·· motion and freedom from binds. The spacebar
should depress and return to the restored position without
drag or binds. Replace the spacebar assembly if binds,
broken mountings, or bent components are discovered. It
may not be necessary to replace the spacebar module
(actuator) if the problem is mechanical.
5.2 ADJUSTMENTS
Adjustment procedures for the IBM 3277 Display Station
should be performed after it is established that all operating
voltages are correct. Paragraph 5.1.3 details the voltage
checkout procedure.
5.2.1
Display Image Adjustments
Atest pattern generated by the diagnostic program provides
the display image to be used during image adjustment. Test
Pattern 2 is used to adjust the Model 1 display image, and
Test Pattern 3 is used to adjust the Model 2 display image.
The procedure for displaying' the required test pattern is
described in paragraph 2.2. If the program~generated test
pattern is not used, the test pattern image must be keyed in
from the keyboard. Diagrams 2-5 and 2-6 show Test
Patterns 2 and 3, respectively.
Adjustments should be performed in the sequence listed.
However, if only minor touchup adjustment is required,
analog card adjustments can be made separately. Use
5.2. 1. 1 Brightness
2. Short together the th ree test pins on analog card. Use a
clip or bare wire. (Pins are located between CHAR
HEIGHT potentiometer and SWEEP INDIC neon.) This
jumper disables vertical deflection and produces a single
horizontal trace across approximate middle of screen.
3. Loosen yoke clamp and rotate yoke until horizontal
trace is parallel to, or coincides with, horizontal lines on
alignment mask.
4. Ensure that yoke is firmly seated against CRT bell while
maintaining horizontal alignment obtained in step 3.
5. Tighten yoke clamp loosened in step 3.
Note: The Brightness control is the outer knob on the
OFF-PUSH switch.
5.2.1.5 Magnetic Centering Rings
Diagrams 7-1 through 7-6 to locate the adjustments
specified in the following procedures. The following
equipment is required.
Alignment mask:
Model 1 - PN 2577899 (Diagram 2-2)
Model 2 - PN 2565170 (Diagram 2-3)
Screwdriver (small blade)
SL T backpanel jumper
Adjust as follows:
1. With Brightness control fully counterclockwise, no
image should be visible.
2. At full clockwise rotation, raster may become visible.
Image may bloom and become excessively bright for
comfortable viewing if Contrast cOl,1trol (inner knob) is
fully counterclockwise.
3. Set Brightness control at point that produces best
display image for comfortable viewing.
5.2.1.2 Contrast
Note: Test Pattern 1 or a customer program that contains
dual brightness fields must be loaded to properly adjust the
Contrast control. The Contrast control is the inner knob on
the OFF-PUSH switch.
Adjust as follows:
1. With Contrast control fully counterclockwise, contrast
between normal and bright fields should be approximately equal.
2. At full clockwise rotation, contrast should be maximum.
Normal brightness characters may disappear from screen
if Brightness control (outer knob) is set at a low level.
3. Set Contrast control for comfortable viewing, with
desired amount of contrast between normal and bright
fields.
5.2.1.3 Focus
Adjust the Focus potentiometer to the point that produces
the sharpest display image. Observe closely the characters at
the center of the screen and those at the edges of the
screen. Set the potentiometer where the best focus over the
entire CRT is achieved. The Focus potentiometer is on the
HV power supply.
5.2.1.4
Yoke
1. Place proper alignment mask in position against face of
CRT.
Note: Use mask PN 2577899 to adjust Model 1 display
stations and mask PN 2565170 to adjust Model 2 display
stations. The yoke shield must be on the yoke before
making the following adjustments.
1. Leave vertical deflection grounding jumper (connected
in step 2 of paragraph 5.2.1.4) attached and the
alignment mask in place for this adjustment.
2. Loosen cone shield retaining screw, rotate cone counterclockwise until locking tabs disengage, and slide cone
back 25 to 38 mm (1 to 1-1/2 inches) to expose tabs on
centering rings.
3. Using tabs on centering rings, rotate rings until horizontal trace passes through geometric center of screen.
(Geometric center is indicated by crossed lines in center
of alignment mask. Vertical center is indicated by line B
on the Model 1 mask·and by line D on the Model 2
mask. Horizontal center is judged by comparing ends of
trace to vertical lines at edges of mask.)
4. Reinstall cone shield.
5. Proceed to paragraph 5.2.1.6 (Model 1 analog card
adjustments) or to paragraph 5.2.1.7 (Model 2 analog
card adjustments).
5.2.1.6 Model 1 Analog Card Adjustments
The procedures described in the following paragraphs apply
only to the IBM 3277 Model 1 Display Stations. See
paragraph 5.2.1.7 for Model 2 analog card adjustment
procedures. These procedures requ ire that the Model 1
alignment mask (PN 2577899) be positioned against the
face of the CRT.
Model 1 Horizontal Width: The vertical deflection
grounding jumper (connected in step 2 of paragraph
5.2.1.4) should remain attached during this adjustment.
Proceed as follows:
1. Adjust Horizontal Width potentiometer so that ends of
horizontal trace on screen coincide with vertical lines C
and E on alignment mask. When adjusted correctly,
trace should be 162.6 ± 1.6 mm (6.4 inches ± 1/16
inch).
2. Check to make sure that horizontal trace still passes
through geometric center of CRT (Line B). Readjust
centering rings as described in paragraph 5.2.1.5 if it is
necessary to move trace back through center of CRT.
3. Remove vertical deflection grounding jumper.
Checks, Adjustments, and Removals
5-7
Model 1 Top Margin: Adjust Top Margin potentiometer so
that top trace of first character row falls within line A
marked on alignment mask.
3. Remove vertical skip disabling jumper. Display image
should appear nearly normal, with inter-row spacing.
Overall image may be too large or too small.
Model 1 Character Height: Adjust Character Height potentiometer so that bottom trace of characters in last row falls
within line D of alignment mask. When adjusted correctly,
overall height of display image should be 99.1 mm (3.9
inches).
Model 2 Inter-Row Spacing: Adjust Row Spacing potentiometer so that bottom trace of characters in last row falls
within line F on alignment mask. When adjusted correctly,
overall height of image should be approximately 203 mm
(8.0 inches) from line B to line F.
Model 1 Linearity: After completing the yoke, centering
ring, and analog card adjustments, check that 20th and 21st
characters on sixth and seventh rows fall within rectangle H
at center of alignment mask. Test Pattern 2 provides
characters in these four locations. Recheck preceding
adjustments if this specification is not met.
Model 2 Linearity: After completing yoke, centering ring,
and analog card adjustments, check that 40th and 41st
characters on 12th and 13th rows fall within rectangle M on
alignment mask. Test Pattern 3 provides characters in these
four locations. Recheck preceding adjustments if this
specification is not met.
5.2.1.7 Model 2 Analog Card Adjustments
The procedures described in the following paragraphs apply
to Model 2 display stations only. (See paragraph 5.2.1.6 for
the Model 1 analog card adjustment procedures.) The
following procedures require that the Model 2 alignment
mask (PN 2565170) be in place at the face of the CRT and
Test Pattern 3 be displayed.
Model 2 Horizontal Width: The vertical deflection
grounding jumper (connected' in step 2 of paragraph
5.2.1.4) should remain attached during this adjustment.
Proceed as foil ows:
1. Adjust Horizontal Width potentiometer so that ends of
horizontal trace on screen coincide with lines E and G
on alignment mask. When adjusted correctly, trace
should be 266.7 mm (10.5 inches).
2. Check to make sure that horizontal trace still passes
through geometric center of CRT (line D). Readjust
centering rings as described in paragraph 5.2.1.5 if it is
necessary to move trace back through center of CRT.
3. Remove vertical deflection grounding jumper.
Model 2 Top Margin:
1. Connect a jumper between logic board pin A lJ2M03
and ground (any D08 pin). This jumper disables vertical
skip circuit, causing inter-row spacing to disappear and
display image to gather toward top of screen.
2. Adjust Top Margin potentiometer so that top trace of
first character row falls within center of line A (marked
on alignment mask).
Model 2 Character Height:
1. Leave vertical skip disabling jumper attached for this
adjustment.
2. Adjust Character Height potentiometer so that bottom
trace of characters in last row coincides with center of
line C on alignment mask. When adjusted correctly,
overall height of display image should be 83.8 mm (3.3
inches) from line A to line C.
5-8
5.2.2 -12V Regulator Card
This adjustment should be performed when the -12V
regulator card is replaced or when a voltage check shows
that -1 2V is not at its nom i nal val u e. Voltage measu rements
are made on TB 1. TB 1 is located on the right side frame in
Model 1 display stations and is under the left side of the
CRT in Model 2 display stations.
1. Set volt-ohmmeter selector switch to a position that will
accurately measure 12V dc.
2. Attach meter plus (+) lead to a dc return (-) terminal on
TB1.
3. Attach meter minus (-) lead to the -12V terminal on
TB1.
4. Adjust potentiometer on -12V regulator card. Use a
small screwdriver. Set potentiometer so voltmeter shows
12V.
5. Remove meter leads from TB 1.
5.2.3 OFF-PUSH Switch (Model 2 Only)
This adjustment should be made after replacing the prime
power box or switch actuator mechanism. Ensure that the
upper chassis is seated properly on the lower chassis, the
chassis clamps are latched, and power is removed before
proceeding. Use Diagram 5-1 to locate the components
specified in this adjustment.
1. Loosen the following components:
a. Front control cable clamp.
b. Rear control cable clamp.
c. Control wire setscrew.
d. Actuator bracket mounting screw.
2. Position control assembly flush with the rear edge of
rear control cable clamp.
3. Tighten rear control cable clamp.
4. Adjust actuator mounting bracket (front to rear) to
center actuator over power switch plungers.
5. Tighten actuator mounting bracket.
6. Tighten front control cable clamp.
Rear Control
Cable Clamp
(Flush Here)
Set Screw
(Access Hole For Side)
Actuator Mounting Bracket
Power Switch Plvngers (2)
Center
Diagram 5·1. OFF·PUSH Switch Adjustment
7. Pull OFF·PUSH switch fully forward to the on
position. Slider should be against the stop ring.
8. Press down and hold actuator so power switch plungers·
are fu Ily activated.
9. Tighten control wire setscrew. (Avoid overtightening
setscrew. Overtightening will cause control wire to
bend and prevent proper operation.)
10. Activate OFF-PUSH switch to check that slider remains
forward against stop ring with power switch plungers
fully depressed. Repeat steps 8 and 9 if these conditions are not met.
5.3 R.EMOVALS
The following paragraphs describe removal and replacement
procedures for IBM 3';.77 Display Station FRUs. Where the
procedure for removing and replacing a unit in the Model 1
display station differs from the procedure used with the
Model 2 display station, a separate paragraph describing the
unique procedure is presented. All removal and replacement
procedures require that the desired unit has been made
accessible· by the removal of necessary covers and made safe
by the removal of power. The top cover can be left on the
display station while performing most maintenance procedures. This provides a degree of safety by keeping the
CRT covered.
5.3.1 Covc,us
5.3.1.1 Model 1 Cov'lr Removal
1. Front Cover: Pull out on bottom edge.
Note: Security key· must be removed from lock before
removing right-side cover.
2. Side Covers: Insert a stiff card or I:)adgein slot in
grillwork at edge of top cover to unlatch side cover•.
3. Top/Rear Center Cover: Release the four quick.
disconnect fasteners that hold combination top/rear
center cover to frame.
Checks, Adjustments, and Removals
5·9
5.3.1.2 Model 2 Cover Removal
5.3.2.3 AC Capacitor
1. Front Cover: Push down on latch (accessible at center
underside of cover). The cover falls away from base
assembly at top while pivoting on two guide pins at
bottom. Lift cover off guide pins.
2. Side Covers: Security key must be removed from lock
before removing right-side cover. Pull frontmost stud
(under front of side cover) toward front of display.
When stud reaches limit of travel, pivot rear edge of
cover slightly away from base and top cover
simultaneously. Lift cover clear of display station. WTC
side covers use a rear retainer spring that blocks travel of
the frontmost stud. Release retainer spring by inserting
screwdriver in spring and twisting while pulling on stud.
3. Top Cover: Top cover can be removed only after both
side covers are removed. Pull out spring-loaded knobs at
lower right and lower left of top cover and pivot up. Pull
top cover back slightly to disengage it from guides in
CRT bezel. Carefully lift cover off display station.
1. Remove rubber boot from top of capacitor, and slide
back on wire leads.
2. Holding insulated handle of a screwdriver, short out
capacitor terminals with metal shaft of screwdriver to
ensure that capacitor is fully discharged.
3. Pull off the two leads from terminals at top of capacitor.
4. Pull capacitor from spring holder.
5. Replace in reverse order.
5.3.2 Power Components
~~N!~~r
I
component removal and replacement procedures must be performed with power turned off and
with the power cord removed from the wall or from the
input jack at the display station.
5.3.2.1
Low- Voltage Power Supply Assembly
1. (This step applies to Model 2 display stations only.)
Remove shield covering printed circuit (PC) board by
prying through slot along right edge of shield.
2. Disconnect the two cable connectors plugged into board.
3. Disconnect wiring from +5V screw and +5V return screw
(Diagram 7-9).
Note: For model 1 the wire attached to the +5V return
screW is part of an optional change and mayor may not
be installed.
4. Remove screw holding assembly to frame. (The screw is
located in center bottom of PC board bracket.)
5. Slide assembly from machine.
6. Replace in reverse order. If a new assembly is being
installed, remove -12V regulator card and replace in new
assembly per paragraph 5.3.2.2.
5.3.2.2 -12V Regulator Card
1. Lift plastic retainer, and pull -12V regulator card from
socket in same manner as an SMS card is removed from a
card socket.
2. Replace card by lifting plastic retainer and sliding card
into the SMS socket.
3. Perform -12V regulator card adjustment (paragraph
5.2.2).
5-10
5.3.2.4 Model 1 Prime Power Box
1. Unplug line cord from line cord jack if it was not
previously removed.
2. Unplug two cable connectors plugged into prime power
box. (Three cable connectors must be removed if an
operator identification card reader is attached on 60-Hz
units.)
3. Pull Brightness and Contrast knobs from OFF-PUSH
switch.
4. Remove the two screws holding prime power box to
frame.
5. Replace in reverse order.
6. If a new prime power box is being installed, Brightness
and Contrast knobs from the old box must be installed
on the new one.
5.3.2.5 Model 2 Prime Power Box
1. Unplug cable connector plugged into rear of box. (Two
cable connectors must be removed if an operator
identification card reader is attached on 60-Hz units.)
2. Unplug line cord from line cord jack if it was not
previously removed.
3. Remove the two screws holding prime power box to
frame.
4. Remove assembly from machine.
5. Replace in reverse order.
6. When replacing box, be sure that the on-off switches
protruding from top of box are positioned under switch
linkage.
7. Adjust position of box so switch plungers depress to
within 1/32" of switch borlv with OFF-PUSH switch
pulled out.
5.3.2.6 Model 1 Ferro Transformer (60 Hz)
1. Unplug ferro transformer cable that plugs into LV power
supply printed circuit board.
2. Unplug ferro transformer cable that plugs into prime
power box.
3. Remove the two wires from ac capacitor.
4. Remove rear screw that holds transformer to base
chassis.
5. Remove front holding screw.
6. Lift transformer clear of the machine.
7. Replace in reverse order.
5.3.2.7 Model 1 Ferro Transformer (50 Hz)
1. Unplug ferro transformer cable that plugs into LV pqwer
supply printed circuit board.
2. Remov~ the two wires from ac capacitor.
3. Refer to Diagram 7-21. Disconnect two wires leading
from ferro terminal block (TB 1) to prime pO\l\fer box by
turning cam screw counterclockwise only. Note where
wires were terminated (for later reconnection).
4. If a card reader is attached, disconnect two wires leading
from ferro terminal block ,to card reader I/O connector.
Note where wires were terminated (for later reconnection).
5. Remove rear screw that holds transformer to base
chassis.
6. Remove front holding screw.
7. Lift transformer clear of mach ine.
8. Replace in reverse order. When connecting wires to
terminal block, cam screw must be turned clockwise.
5.3.2.8 Model 2 Ferro Transformer (60 Hz)
1. Disconnect LV cable connector (J2) between the two
chassis.
'2. Remove all I/O connectors (keyboard, card reader,
I/O).
3. If a card reader is attached, unplug cable from rear of
prime power box.
4. If a selector-pen is ,attached, remove cable from clip at
lower rightrear,of frame.
5. Release the two clamps at sides of chassis that hold
upper chassis to base chassis.
6. Release spring catches on rear guides, and slide upper
chassis slightly to front to disengage the two rear
guides.
7. Lift upper chassis off base chassis, and. place upper
chassis on a flat surface.
8. Remove.ac capacitor per paragraph 5.3.2.3.
9. Remove screw holding ferro cover, and remove cover.
10. Disconnect the two cable connectors leading from ferro
transformers.
11. Remove the two screws holding ferro to base chassis.
12. Slide transformer out of housing and clear of chassis.
13. Replace in reverse order.
5.3.2.9 Model 2 Ferro Transformer (50 Hz)
1. Disco'nnect LV cable connector (J2) between the two
chassis.
2. Remove all I/O connectors {keyboard, card reader,
I/O).
3. If a card reader is attached, unplug cable plugged in
ferro transformer cover.
4. If a selector-pen is attached, remove cable from clip in
lower right rear of chassis.
5. Release the two clamps at side of chassis holding upper
chassis to base chassis.
6. Release spring catches on rear guides, and slide upper
chassis slightly to front to disengage the two rear
guides.
7. Lift upper chassis off base chassis, and place upper
chassis on a flat surface.
8. Remove ac capacitor per paragraph 5.3.2.3.
9. If ,a card reader is attached, remove access cover on
ferro cover over ferro terminal block (Diagram 7-21),
and disconnect two wires leading from terminal block
to connector on ferro cover by turning cam screw
counterclockwise only. Note where leads were
terminaled (for later reinstallation).
10. Remove screw holding ferro cover and remove cover.
11. Disconnect the two wires leading from ferro terminal
block to prime power box by turning cam screw
counterclockwise only. Note where leads are terminated for later reinstallation.
12. Remove the t~o screws holding ferro to base chassis.
13. Slide transformer out of housing and clear of chassis.
14. Replace in reverse order. When connecting wires to
terminal block, cam screw must be turned clockwise.
5.3.2. 10 H igh- Voltage Power Supply
1. Disconnect anode lead from CRT.
2. Unplug input table at lower edge of HVassembly. Note
where leads are terminated (for later reconnection).
3. Remove mounting screw.
4. Lift power supply clear of machine.
5. Replace in reverse order. Ensure that anode lead is
firmly seated in CRT bell.
5.3.2. 11 Fuses
1.
2.
3.
4.
Determine which fuse is blown.
Replace blown fuse with another fuse of same value.
Turn power on.
Check that fuse does not blow again.
Note: The +8V, -12V, and 6.3V ac fuses are held in fuse
clips located on the LV power supply printed-circuit
board. Remove plastic shield over the LV power supply
board on Model 2 display stations to replace these fuses.
The ac line fuse is located in a screw-type fuse holder on
th~ prime power box. The +5V and +34 V fuses are
located at:
+5V (Model 1):
+34V (Model 1):
+5V (Model 2):
+34V (Model 2):
}
A/F 1
A/F2
01C/F1
01C/F2
Diagram 7-3
1
Diagram 7-5
5.3.2.12 Voltage Distribution Board (Model 2 Display
Stations Only)
1. Disconnect the LV cable connector (J2) at the top of
the LV power supply near the front of the unit (Diagram
7-4).
2. Remove the cable tie that holds the LV cable against the
chassis.
Checks, Adjustments, and Removals
5-11
3. Unsolder the two wires connected to the +34V fuse at
01C/F2 A and B (Diagram 7-5).
4. Remove retaining screw in the corner of the voltage
distribution board; move board toward the power switch
and remove from unit (Diagram 7-6).
5. Install the voltage distribution board by reversing the
procedure given in steps 1 through 4. When connecting
the two wires to the +34V fuse, solder lead No.4 of the
new cable to 01C/F2-A and lead No. 16 to 01C/F2~B.
5.3.3 Analog Components
5.3.3.1 CRT
I
DANGER
All persons .handlin g a CRT or who are near an exposed
CRT under vacuum must wear safety glasses and
long-sleeved garments.
The yoke and shield assemblies are removed with the CRT.
To remove the CRT from the display station, proceed as
follows:
Modell
1. Disconnect power cord at display station (under front
cover).
2. Remove left, right, and top covers (5.3.1.1).
3. Remove mask/bezel assembly by loosening the. two
captive knurled head screws that hold assembly to
frame.
4. Carefully disconnect CRT anode lead. Static charge
may be present.
5. Using an insulated jumper wire, momentarily ground
CRT anode terminal to discharge static charge.
6. Disconnect yoke cable from analog card, and disconnect ground wire(s) from yoke shield.
7. Remove cone shield from base area of CRT:
a. Loosen cone shield retaining shoulder screw.
b. Rotate cone counterclockwise until locking tabs
disengage.
c. Pull cone straight back and clear of CRT neck.
8. Remove socket from base of CRT.
9. Open new CRT carton and place pad on firm surface
close to display station so that a safe place is available
when old CRT is removed.
CAUTION
The following steps free the CRT from its mounting.
The tube weighs about 1.8 kg (4 pounds). Protect
and support CRT from excessive pressures that could
cause damage to the CRT or other components.
10. Remove top two CRT holding nuts, and remove
grounding spring.
11. Loosen the bottom two holding nuts.
12. Connect lifting strap (PN 2565197) to top CRT
mounting ears. (It may be necessary to slide CRT off
the threaded studs arid tilt it forward to attach strap to
mounting ears.)
5-12
13. Remove bottom two holding nuts.
14. Carefully slide CRT and yoke assembly toward front of
display station and clear of unit.
15. Piace CRT face down on pad.
16. Note approximate orientation of yoke with reference
to CRT.
17. Loosen yoke and shield retaining clamp and carefully
slide assembly off CRT neck.
18. Install yoke and shield assembly on new CRT in
location noted in step 16.
19. Install new CRT in reverse order, ensuring that CRT
grounding spring (step 10) and yoke shield ground
wire(s) (step 8) are reconnected.
20. Perform all Model 1 display image adjustments (5.2.1
through 5.2.1.6).
Model 2
1. Disconnect power cord at displa'y station (under front
cover).
2. Remove left, right, and top covers (5.3.1.2).
3. Remove Contrast and Brightness control knobs.
4. Mark position of power control actuator assembly on
left side rail.
5. Remove the two power control actuator mounting
screws. (One screw attaches assembly to side rail; the
other attaches to front frame.)
6. Remove power control actuator assembly to expose
lower left CRT holding nut.
7. On units with security keylock optional feature:
a. Mark location of keylock assembly mounting
bracket on front frame.
b. Remove screws holding bracket to frame.
c. Place keylock assembly aside to expose lower right
CRT holding nut.
8. Carefully disconnect CRT anode lead. Static charge
may be present.
9. Using an insulated jumper wire, momentarily ground
CRT anode terminal to discharge static charge.
10. Disconnect yoke cable from analog card, and disconnect ground wire(s) from yOke shield.
11. Remove socket from base of CRT.
12. Remove cone shield from base area of CRT:
a. Loosen cone shield retaining shoulder screw.
b. Rotate cone counterclockwise until locking tabs
disengage.
c. Pull cone straight back and clear of CRT neck.
13. Open new CRT carton and place pad on firm surface
close to display station so that a safe place is available
when old CRT is rer(loved.
CAUTION
The following steps free the CRT from its mounting.
The tube weighs about 7.2 kg (16 pol:Jnds). Protect
and support CRT from excessive pressures that could
cause damage to the CRT or other components.
14. Remove 'top two CRT holding nuts, and remove
grounding spring.
15. Loosen bottom two holding nuts.
16. Connect lifting strap (PN 2565197) to top CRT
mounting ears.
17. Remove bottom two holding nuts.
18. Carefully slide CRT and yoke assembly toward rear of
display station and clear of unit.
19. Place CRT face down on pad.
20. Note approximate orientation of yoke with reference
to CRT.
21. Loosen yoke and shield retaining clarnpand carefully
slide assembly off CRT neck.
22. Install yoke and shield assembly on new CRT in
location noted in step 20.
23. Install new CRT in reverse order, ensu ring that CRT
grounding spring ,(step 14) and yoke shield ground
wire(s) (step 12) are reconnected.
24. Perform all Model 2 display station image adjustments
(5.2.1 through 5.2.1.7).
Note: To dispose of a defective CRT, follow the instructions given in the CRT dispo~ition procedure that is
available at the branch office.
5.3.3.2 Yoke and Shields
The yoke and shield assemblies are removed from the CRT
neck as a unit. After the assemblies are removed, they can
be separated.
Note: Top cover on Model 2 display station must be
removed before cone sh ield can be moved hack to observe
CRT filament.
9. Perform all display . image adjustments (5.2.1.4 through
5.2.1.7). , .
5.3.3.3 Model 1 Analog Card
CAUTION
Perform HV power supply check (par. 5.1.3.5) before
installing a new analog card. Premature failure of new
analog card may result if power supply is defective.
1. Unplug connectors at top of analog card.
2. Loosen the two captive screws passing through analog
3.
4.
5.
6.
7.
8.
card and into wire form. (These two screws have large
knurled heads and a spacer on them.)
Unplug cottom connector.
Remove analog card from machine.
Remove the two screws and spacers' from old analog
card.
Reassemble screws and spacers in new analog card.
Plug inbottorn connector.
Replace analog card in machine.
Note: The two open slots in the rear edge of the analog
card must fit into the slots in the rear leg of the wire
form.
9. Tighten the two captive screws.
10. Plug in two top connectors.
11. Perform analog card adjustments (paragraphs 5.2.1.6
and 5.2.1.7) if a new card is installed or if the
adjustments were disturbed.
5.3.3.4 Model 2 Analog Card
1. Disconnect yoke cable from analog card, and disconnect
2.
3.
4.
5.
6.
7.
8.
ground wire(s) from yoke shield.
Remove socket from base of CRT .. (On Modell display
stations it is necessary to perform step 3 before socket
..
can be removed.)
Remove cone shield from base area of CRT:
a. Loosen shield retainingshoulder scre"".
b. Rotate cone counterclockwise until locking tabs
disengage.
c. Pull cone straight back and clear of CRT neck.
Note approximate orientation of yoke with reference to
CRT.
Loosen'yoke and shield retairiingclamp and carefully
slide assembly off CRT neck.
Separate yoke from shield.
Replace in reverse order. Position yoke on CRTas noted
in step 4., (Yoke cable should beat bottom, and clamp
screw should be on left side as viewed from top-front of
display station.)
Ensure that grounding spring (fingers)pn fr0l'lt ,of yoke
is in contact with the conductive coating. of the CRT bell
by pressing yoke assembly tovvard face ,of CRT before
tightening clamp screw.
CAUTION
Perform HV power supply check (par. 5.1.3.5) before
installing a new analog card. Premature failure of new
analog card may result if power supply is defective.
1. Open logic gate.
2. Remove the two upper screws supporting analog card
shield, and lift off shield.
3. Unplug cables plugged into front of analog card.
4" Remove the two screws holdin,g analog card to base
chassis.
,
5. Remove analog card from support.
6. Unplug rear connector.
7. Replace in reverse order.
8. Perform analog card adjustments (paragraph 5.2.1.7) if a
new card is installed or if the adjustments are disturbed.
5.3.3.5 Model 1 Brightness and Contrast Controls
The Brightness and Contrast controls are part of the prime
power box on Model 1 display stations. Do not replace
these controls; replace prime power box. See paragraph
5.3.2.4 for prime power box replacement procedure.
Checks, Adjustments, and Removals
5-13
5.3.3.6 Model 2 Brightness and Contrast Controls·
1. Unsolder the three leads on each of the two potentiometers. Note terminals from which wires are removed,
for later reinstallation.
2. Pull the two knobs off concentric control shafts.
3. Remove rear-most C clip on slider bracket that retains
slider bracket to potentiometer: shaft.
4. Pull off large retaining clip that holds potentiometers to
mounting bracket.
5. Lift assembly clear of unit from r~ar.
6. Assemble in reverse order.
7. Turn power on. '
8. Check for proper operation of both controls.
,pins and to replace logic cards, in proper sockets.
10. Rewire Keyboard Feature Jumpers onto new board if
feature was present.
5.3.5 Keyboard cOmponents
This section describ~s procedures to remove and replace
keyboard components. Paragraphs 5.3.5J through 5.3.5.5
are common to Type A and Type B keyboard assemblies,
paragraphs 5.3.5.6 through 5.3.5.8 apply only to Type A,
and paragraphs 5.3.5.9 through 5.3.5.11 apply only to
Type B. Ensure that the correct procedure is used. The
following equipment may be r~quired:
Key top puller tool
5.3.3.7 Power Control Switch
,
.
The power controlswitch is part of the prime power box. If
it is necessary to replace the switch, the prime power box
must be replaced. See paragraph 5.3.2.4 for the Model, 1
prime power box replacement procedure or paragraph
5.3.2.5 for the Model, 2 prime power box replacement
procedure.
5.3.4
Logic Components
5.3.4. 1 Logic Card
1. Turn power off.
2. Pull out on the two handles on plastic c~rd holder to
disengage card from board.
3. Pull logic card from socket evenly and perpendicular to
logic board.
4. If card is being changed, remove card holder from old
card and install it on new card.
5. Place card in socket guides.
6. Push card on logic board pins. Do not bend pins. Make
sure card seats firmly, with a snap, in socket.
7. Turn power on.
5.3.4.2 Logic Board
1. Turn power off.
2. Remove all cards from board to be replaced, noting
positions.
3. Remove decouplihg capacitor from clip, and remove
capacitor wires from the two board pins: Note where
wires were terminated, for later reinstallation.
4. Remove all cables' 6n pin side of board. Cables' are
labeled with their pin assignments.
5. Remove plastic bumper (yoke assembly). Check for
presence of Keyboard Feature Jumpers (Diag.6-10).
Note t~rminations.
6. Remo've voltage buses from board with cables attached.
Note positions for re-installation.
7. Remove all socket-head screws with clamps that hold
board to gate.
8. Remove board, from machine while unplugging connectors plugged in card side of board.
9. Replace in reverse ord~r. Be extremely careful to
replace wires, cables, and connectors on correct board
5-14
, Isapropylalcohol
Cloth (lint-free)
-
PN 9900373 (preferred), PN
75475, or PN 627953
PN 2200200 (or IBM tape
transport cleaner - PN 453511)
PN 2108930 (or tissue- PN
2123106)
5.3.5.1 Keyboard from Display Station
1.
2.
3.
4.
Turn power off.
Remove display station front cover.
Disconnect keyboard cable ground strap from chassis.
Remove keyboard cable connector from its socket.,·On
Model 2 display stations, I/O cable retainer must be
unhooked, to release keyboard connector. On Model 1
display stations, nylon cable clamp must be removed.
5. Replace in reverse order.
6. Ensure that all I/O cable connectors are firmly seated in
sockets and that ground straps are attached.
5..3.5.2 Keyboard Top Cover
1. Turn keyboard over.
2. Loosen the four captive screws in corners of keyboard
bottom pan.
3. Place keyboard upright on a flat surface.
4. Lift 'top cover off keyboard.
5. Replace in reve~se order.
5.3.5.3 Keyboard Assembly from Bottom Pan
1. Disconnect keyboard;from display station. (See paragraph 5.3.5.1.)
2. Remove keyboard top cover. (See paragraph 5.3.5.2.)
3. Disconnect· keyboard cable ,connector.
4. Remove the four fasteners that hold keyboard assembly
to mounts. (Type A assemblies use nuts; Type B use
screws.)
5. Lift keyboard assembly off mounts.
6. Replace'in reverse order.
7. Ensure that,cableconnector is firmly seated.
5.3.5.4 Audible Feedback Assembly
1. Disconhectkeyboard from dispray station. (See para, graph 5.3.5'.1.)
2. Remove keyboard top cover.(5ee paragraph'5.3.5.2':)
Note: The audible feedback device consists of two assemblies. The logic card is removed by pulling it out of its
socket. To remove the audible feedback assembly, proceed
with steps 3 and 4.
3. Disconnect the two leads from audible feedback
assembly at connector positions 8 (white wire) and 9
(blue wire). On assemblies where logic card is mounted
horizontally, it is necessary to remove card socket for
access to leads.
4. Remove the two screws that hold relay assembly to
keyboard bottom pan.
5. Replace in reverse order.
5.3.5.5 Keybutton
A keybutton should be replaced when it deteriorates in
appearance or when it fails to remain attached to the key
stem. Buttons are removed by sliding the key top puller tool
over the key top and pulling straight up.
5.3.5.6 Type A Switch Module
Steps 1-3 must be performed in the order listed before
removing the switch module.
1. Disconnect keyboard from display station. (See paragraph 5.3.5.1.)
2. Remove keyboard top cover. (See paragraph 5.3.5.2.)
3. Remove keyboard assembly from bottom pan. (See
paragraph 5.3.5.3.)
A. Switch Module Removal (Except Spacebar Switch
Module):
1. Record locations of keybuttons in area of switch
module (PN 5995542) being replaced. Remove
keybutton from faulty module (and from as many
others as needed to provide work space):
2. Take the two small, flat, pointed tools from box
containing new module, and slip one down the
inside face of each D bracket (retainer) to force
brackets away from locking channels on plastic
case of old module (Diagram 5-2),
3. With flat tools in this position, grip shouldered
portion of switch module plunger with pliers, and
pull switch module straight out.
Diagram 5-2. Switch Module Removal (Type A)
4. The black plastic lead frame package is left behind
when the plu nger assembly is removed. Using
solderwick (PN 5151439), unsolder and remove
excess solder from the four terminal pads on
printed circuit board (Diagram 5-3). Remove lead
frame package from printed circuit board (Diagram 5-4).
CAUTION
I n the next step, do not apply the soldering iron
for longer than necessary to flow the solder.
Diagram 5-3. U nS()ldering Lead Frame Terminals (Type A)
Checks, Adjustments, and Removals
5-15
I/SP'in
Lead Frame
Terminals
Q
I
I
)
I(
I I
./
Plunger
Return
Spring
Boss
Diagram 5-4. Lead Frame Removal (Type A)
Diagram 5-5. Switch Plunger Return Spring Positioning (Type A)
Note: If the switch mounting frame becomes
distorted during removal of the old module, form
it back to its normal position. This can be done by
squeezing the D brackets together until they will
seat firmly against the sides of the new module
housing.
B. Switch Module Replacement: Do not disassemble
replacement module. Lead frame and plunger
assemblies are matched during manufacture. Proceed
as follows:
1. Check that return spring isfirmly seated on spring
boss on bottom of plunger of new switch module
(Diagram 5-5). If it is not, invert switch module so
that lead frame terminals are up. Place spring on
boss. Compress and rotate spring until last coil
expands around boss. When properly seated, spring
should be parallel to long axis of switch module.
2. Insert module into keyboard switch mounting
frame, with orientation arrow on top of module
pointed in the same direction as arrows on other
modules (Diagram 5-6). As module is inserted, be
sure plunger return spring seats on raised boss on
bottom of mounting frame and that the four
terminals extend through holes in printed-circuit
board.
Note: When the plunger return spring is in place,
check the lead frame terminals to see that they are
not bent and that they are parallel to the long axis
of the switch module.
Diagram 5-6. Switch Module Orientation (Type A)
5-16
Once new module is in place, check for the
following conditions:
•
Plu nger moves freely.
•
Top surface of module is even with those of
other modules.
•
D brackets on mounting frame lock module
firmly in place.
Note: Should it be necessary to remove the new
module to correct any of these conditions, be
careful not to mar any portion of the plunger,
since operation of the module and/or retention
of the keybutton would be affected.
CAUTION
In the next step, do not apply soldering iron for
longer than necessary to flow the solder.
3. Solder terminals of lead frame. Use a minimum
amount of solder.
4. Reassemble keybuttons on switch modules. Check
to see that correct keybuttons are returned to
correct module positions.
5. I nstall the assembly on the bottom pan, replace
keyboard top cover, and reconnect keyboard to
display station.
B. Spacebar Replacement:
1. If spacebar switch module is to be replaced, use
procedure described in paragraph 5.3.5.6B, steps 1
through 3.
2. If spacebar group is to be replaced, insert new
spacebar guide modules into mounting frame; be
careful to have torsion bar retaining lugs positioned
to the front. Be sure that D brackets lock guide
modules firmly in place.
3. Insert spacebar guides in spacebar guide modules, and
drop spacebar in place.
4. Holding torsion bar at a suitable angle and position,
insert end of torsion bar in the hole in one spacebar
guide (Diagram 5-8). At the same time, engage torsion
bar with retaining lugs on guide module. Lower
torsion bar to horizontal. Flex it as during removal,
and insert other end simultaneously into hole in other
spacebar guide and into retaining lugs on other guide
module.
5. Operate spacebar to see that switch module operates
freely and that torsion bar and spacebar gu ides do not
bind.
6. Replace keyboard top cover and reconnect keyboard
to display station.
5.3.5.7 Type A Spacebar Assemblies
Type A spacebar assemblies consist of the spacebar group
(PN 5995544) and the spacebar switch module (identical to
other switch modules). The spacebar group comprises the
spacebar, the torsion bar, and the two spacebar guide
modules. Replacement of any spacebar part requires
removal of the spacebar and torsion bar. Perform the
removals in paragraphs 5.3.5.1 through 5.3.5.3 for access to
the keyboard assembly.
A. Spacebar Removal:
1. Grasp torsion bar near one end with thumb and
forefinger (Diagram 5-7) and flex it upward, snapping
it forward out of retaining lugs on spacebar guide
module.
2. Swing loose end of torsion bar upward, and disengage
it from other spacebar guide module.
3. Lift spacebar straight up out of spacebar guide
modules. This exposes spacebar guide modules and
spacebar switch module.
Diagram 5-7 . Torsion Bar Removal (Type A)
4. If spacebar group is to be replaced, remove spacebar
guide modules as explained in paragraph 5.3.5.6A,
step 2. (See Diagram 5-8). Lift module straight out
with thumb and forefinger.
5. If spacebar switch module is to be replaced, remove
switch module as described in paragraph 5.3.5.6A,
steps 2 through 4.
Diagram 5·8. Spacebar Guide Module Removal (Type A)
Checks, Adjustments, and Removals
5-17
5.3.5.8 Keybutton Support Modules - Type A Keyboards
Only
The longer keybuttons, 1-3/4 and 2-3/4 units long, on Type
A keyboard utilize support modules PN 5995543 and PN
5995547, respectively.
A. Support Module Removal:
1. Remove keybutton(s) to provide adequate work
space.
2. Take the two small, flat, pointed tools from box
containing new module, and slip one down inside face
of each D bracket (retainer) to force brackets away
from locking channels on plastic case of old module.
3. With flat tools in this position, grip shouldered
portion of support module plunger with pliers, and
pull old module straight out.
B. Support Module Replacement:
1. Check that return spring is firmly seated on spring
boss on bottom of plunger of new support module. If
it is not, invert module, place spring on boss, and
compress and rotate spring until last coil expands
around boss.
2. Insert new module into keyboard switch mounting
frame, with orientation arrow on top of module
housing pointed in same direction as arrows on other
modules. As module is inserted, be sure plunger
return spring seats on raised boss on bottom of
mounting frame.
Once new module is in place, check that plunger
moves freely, that top surface of module does not
extend above other modules, and that D brackets on
mounting frame have locked module firmly in place.
3. Reassemble keybuttons on switch modules. Check
that correct keybuttons are returned to correct
module positions.
5.3.5.9 Type B Module
Steps 1-3 must be performed in the order listed before
removing the module. Cleanliness is important when
working on the keyboard. Any particle between the key
module flyplate and the printed circuit board is a potential
problem. Before keyboard disassembly, prepare a smooth,
clean work area by wiping contamination away with a
lint-free cloth dampened with isopropyl alcohol. Gently
tap, brush, and shake the keyboard assembly to remove
most loose particles that could get into the PC board and
flyplate area during disassembly and reasSembly.
1. Disconnect keyboard from display station. (See paragraph 5.3.5.1.)
2. Remove keyboard top cover. (See paragraph 5.3.5.2.)
3. Remove keyboard assembly from bottom pan. (See
paragraph 5.3.5.3.)
1. Ensure that all small particles that might contaminate the keyboard assembly are removed from the
work area.
2. Record locations of key buttons in area of module
that is being replaced. Remove keybutton from
faulty module and from as many others as may be
required to provide enough work space.
3. Place keyboard assembly upside down in the
cleaned area, and loosen the screws holding base
plate and circuit board to the all-keys assembly
(Diagram 5-9). Do not remove the holding screws
at this time.
4. Place keyboard assembly right side up, and slide
one corner off the work surface edge to expose
one holding screw. With fingers, remove holding
screw from bottom.
5. Carefully rotate keyboard assembly and remove
remaining holding screws, one at a time. Keep the
all-keys assembly and PC board together.
Diagram 5-9. Screw Loosening (Type B)
6. Lift the all-keys assembly from the circuit board,
and place the assembly right side up (keybuttons
up) in the clean area. Handle the all-keys assembly
by the sides (Diagram 5-10). Be careful not to
depress any keys while removing assembly, since a
flyplate could detach.
A. Module Removal (Including Spacebar Module):
Note: See paragraph 5.3.5.10 for spacebar removal if
spacebar module is to be replaced.
5-18
Diagram 5-10. Keyboard Assembly Separation (Type B)
Note: Replace the key module if the flyplate
comes off. Do not attem'pt to repair the module.
Repaired modules can cause interm ittent failures.
10. Install the keyboard assembly on the bottom
pa n, replace keyboard' top cover, and
reconnect keyboard to the display station. ,
7. Raise the edge of the all-keys assem bly nearest the
key module to be, replaced ,about 6.4 mm (1/4
inch). Press down on the shoulder of the key
module until it snaps out of the retaining piate
(Diagram 5-11).
8. Select either removal method, a or b, below, that
is most conven ient.
a. Lift the all-keys assembly, leaving behind the
defec~ive ,key module. Place the ~II-keys
asse~bly rightsideupin 'the cl~an area. '
b: Lift the all-keys assembly ,leaving behind the
defective module. Place the all-keys assembly
upside down, either on the existing system
keyboard mounting hardware and brackets or
on prepared supports (such as blocks of wood
or standoffs).
B. Module ReplacemfJrit:
1. Observe orientation of the new key module.
Ensure that the alignment lug and keystem are
in the same position as the rest of the modules
in the all-keys assembly.
2. Install new module (PN 1772948) by lowering
the all-keys assembly over the new module (if
step 8a was used for removal) or by snapping
the key module in the retaining plate by hand
from the bottom (if step 8b was used for
removal).
3. Clean the printed circuit board (Diagram 5-12)
and key m()dule flyplates by carefully wiping
each with a lint-free cloth dampe'ned with
isopropyl', alcohol. Be careful not to dislodge or
remove.flyplates from key modules.
4. Align the holding screw holes through base
plate, PC board, insulator, and t()P insulator (if
'present). Diagram 7-18 shows the correct
locations of these components. Lower the
all-keys assembly into place.
5. Carefully slide one corner of the keyboard
assem bly off the work area edge, and install
one holding screw finger tight. R()tate keyboard assembly carefully, and install remaining
screws finger tight.
6. Turn keyboard assembly upsidedown, and
tighten all holding screws with a screwdriver.
7. Turn keyboard assembly rightside up, and
i
.. reinstall ,keybuttons in proper locations.
8. Manually check operation of each key module.
9. With an ohmmeter, check for continuity
between, the base plate and KB 1 connector
pin 008. The two base plate grounding studs
(Diagram 5-13) must contact the PC board
ground circuit.
Diagram 5-12. Circuit Board and Electronics Assembly (Type B)
Ground Stud (2)
Diagram 5-13. Base Plate Ground Studs (Type B)
Checks, Adjustments, and Removals
5-19
5.3.5.10 Type B Spacebar
Perform the removals described in paragraphs 5.3.5.1
through 5.3.5.3 for access to the keyboard assembly.
A. Spacebar Removal:
1. Grasp spacebar button at each extreme end (outboard
of the modules) and remove by applying even upward
force.
2. Pivots cC;Jn be removed (if required) by prying with
the tip of a screwdriver placed in the molded slot in
the side of the pivot (Diagralll 5-14).
1. Clean the work area and prepare the keyboard. (Use
steps 1-3 of paragraph 5.3.5.9.)
2. Disassemble keyboard. (Use steps 3-6 of paragraph
5.3.5.9A.)
3. Reassemble keyboard. (Use steps 2-9 of paragraph
5.3.5.9B.)
5.3.6 Audible Alarm (Optional Feature)
The audible alarm device'circuitry is packaged in a small
metal box mount~d on the base chassis beneath the CRT,
inside the front cover. The audible alaJ::rn box is mounted
vertically on Model 1 display stations and horizontally on
Model 2 display stations.
1. Remove front cover.
2. Remove audible alarm box from chaSSIS. Box can be
removed from snap fasteners by rocking metal box while
pulling away from chassis.
3. Remove circuit board from the metal box.
4. Remove cable wires from audible alarm circuit board
with long-nosed pliers or small blade screwdriver.
5. Replace in reverse order. Circuit board is etched with
color code of wires to be replaced.
5.3.7 ., Security Keylock (Optional Feature)
Diagram 5-14. Spacebar Pivot Removal (Type B)
5.3.7. 1 Model 1
B. Spacebar Replacement:
1. Snap any pivots' removed in step 2 (above) into
mounting frame.
2. Place spacebar button over its respective modules,
and lower it into position while engaging the
stabilizer bar in the two pivots.
3. Apply downward pressure on spacebar at the points
directly over spacebar modules to seat the spacebar
button.
4. Check spacebar operation for binds. If binds are
present, the most common problem is a slightly bent
right module stem. This stem can be straightened to
eliminate the bind.
5. Replace keyboard top cover, and reconnect keyboard
to display station.
5.3.5.11 Circuit Board and Electronics Assembly - Type B
Keyboards Only
The circuit board and electronics assembly is a fieldreplaceable unit on Type B keyboards. To remove or
replace the circuit board and electronics assembly, proceed
as follows:
5-20
1. Remove screws that hold keylock assembly to frame.
2. Release cable clamps that route switch assembly cable to
logic board.
3. Remove cable leads from connector at socket A 1Z3.
Note positions from which wires are removed (for later
reconnection).
4. Lift switch cable assembly free of mach ine.
5. Reassemble in reverse order. Make sure that leads
removed in step 3 are replaced in proper connector
positions and that keylock assembly is aligned with hole
in right side cover.
5.3.7.2 Model2
1. Remove screws that holdkeylock assembly to frame.
2. Remove keylock assembly cover.·
3. Remove cable leads from switch with pliers or small
screwdriver. Note terminals from which leads are
removed (for later connection).
4. Remove cable strain relief from hole in switch assembly.
5. Remove cable from keylock assembly •.
6. Reassemble in reverse order; Make sure to align keylock
assembly with hole in right side cover.
aids are not intended to replace the existing procedures,
CEMs, or other published data.
5.3.8 Selector Light Pen (Optional Feature)
5.3.8. 1 Model 1
1. Remove screws from base of selector light-pen holder;
remove cable.
2. Unplug feature cable from logic board cable socket Y 4.
3. Unscrew nylon cable clamp screw that holds cable to
center rear of board assembly.
4. Remove screw and retainer that clamps routing cable
and ground wire to rear of chassis.
5. Slip cable out of slotted hole at center rear of chassis.
6. Replace in reverse order. Make sure that ground wire is
reconnected to chassis, and that cable is positioned in
slot so that extra insulation on cable acts as a grommet.
7. Position light-pen cable in pen holder so that distance
from holder to cable end of pen is about 762 mm (30
inches).
5.4.1. 1 Work Area
Before beginning any keyboard disassembly, prepare a
smooth, clean work area by wiping contamination away
with a lint-free cloth dampened with isopropyl alcohol.
Gently tap, brush, and shake the keyboard assembly to
remove most loose particles that can get into the PC board
and flyplate area during disassembly and reassembly.
5.4.1.2 Keyboard Assembly
5.3.8.2 Mode/2
1. Remove screws from base of selector light-pen holder;
remove cable.
2. Unplug feature cable from logic board cable socket Y 4.
3. Release cable from cable clamps that route cable to
bottom of chassis.
4. Disconnect ground wire from frame.
5. SI ip cable out of slotted hole at bottom, right, rear of
chassis.
6. Replace in reverse order. Make sure cable is positioned in
cable clamps so that extra insulation on cable acts as a
grommet where cable passes through hole in chassis.
Make sure that ground wire is reconnected to frame.
7. Position light-pen cable in pen holder so that distance
from holder to cable end of pen is approximately 762
mm (30 inches).
5.3.9 Operator
Feature)
5.4.1 Cleaning
The importance of cleanliness when servlcmg Type B
keyboards cannot be overemphasized. Any particle between
the key module flyplate and the printed circuit board is a
potential problem.
Identification
Card
Reader
(Optional
1. Disconnect card reader cable ground strap from chassis.
2. Remove card reader cable connector from its socket. On
Model 1 display stations, nylon cable damp must be
removed. On Model 2 display stations, the I/O cable
retainer must be unhooked to release cable connector.
3. Replace in reverse order.
4. Ensure that all I/O cable connectors are firmly seated in
sockets and that all ground straps are attached to chassis
ground terminal.
Before reassembling the keyboard assembly, the printed
circuit board and key module flyplates must be carefully
cleaned by wiping each With a lint-free cloth dampened
with isopropyl alcohol. Be careful not to dislodge or
remove flyplates from key modules while cleaning. Replace,
rather than attempt to repair, the key module if the
flyplate separates from the module.
5.4.2 Liquid Spills
Some minor liquid spills, such as soft drinks or coffee with
sugar, can be removed by first "washing" the PC board and
affected flyplates with a lint-free cloth dampened with a
mixture of water and mild hand soap. "Rinse" with a
water-dampened, lint-free cloth. Finally, clean with lint-free
cloth dampened with isopropyl alcohol.
Note: Sticky key modules must be replaced. A severe liquid
spill may necessitate replacement of the entire keyboard
assembly.
5.4.3 Key Modules
Two types of key modules, the original "black body"
module and a new "super slick" white body module, are
currently in use on Type B keyboards. Super slick key
modules must not be used on keyboards that are attached
to 3277 display stations. These modules can cause intermittent errors.
5.4 TYPE B KEYBOARD MAINTENANCE AIDS
5.4.4 Contamination Shields
The Symptom Index in Chapter 3 and the Troubleshooting
Diagrams in Chapter 4 isolate Type B keyboard malfunctions. The check and removal procedures presented earl ier
in this ch.apter provide detailed instructions for repairing
keyboard faults. This section provides miscellaneous maintenance aids to supplement the existing procedures. These
Some keyboards have foam strips, foam side insulators, and
a 0.038 mm (1.5-mil) protective membrane/shield added to
prevent contamination from entering the PC board and flyplate area during customer use. The presence of these
shields is a function of the EC level of the keyboard. The
shields are shown in Diagram 7-18.
Checks, Adjustments, and Removals 5-21
5.4.5 Protective Membrane/Shield
When removing a key module from a keyboard with the
protective shield, care must be taken not to puncture the
shield when snapping out the defective module.
5.4~6
Ground Check
There should be continuity between the two base plate
grounding studs (Diagram 5-13) and the dc ground circuit
on the PC board. Grounding can be checked with an
ohmmeter connected between the base plate and the
ground -pin, 008, at the interface signal connector, KB 1.
5~4.7
Ground Loop -Isolation
Nonconductive inserts have been added to the base plate
holding screws on some keyboard assemblies to isolate the
base plate and PC board dc ground from the all-keys
assembly. With the keyboard assembly disconnected from
the 3277, check to ensure that the base plate and all-keys
assembly are not electrically shorted.
5.4.8 Crooked or Loose Key tops
Key module stems can be formed left or right to align a
crooked looking key top. The keystem ears can be widened
to tighten loose key tops.
5-22
Section 6. Reference Data
This section contains miscellaneous reference information
that can be helpful in maintaining IBM 3277 Display
Stations.
6.1 CONTROLS
Controls are divided into two categories: external and
internal. External controls are those that are accessible
without removing covers. Internal controls are those that
are under covers and are accessible to maintenance personnel only. The audible alarm volume control, although
located under the front cover, is considered an external
control because the display station operator can adjust the
volume.
6.1.1
External Controls (Diagram 6-1 )
toward the operator turns display station power on. The
overall displayed image is made brighter by rotating the
Brightness control (outer knob) clockwise; the image is
made dimmer by rotating the knob counterclockwise. The
Contrast control (inner knob) is on a concentric shaft with
the Brightness control. Rotating the Contrast control
clockwise reduces the difference in contrast between high
and normal intensity characters; rotating the control
counterclockwise increases the difference in contrast.
6.1.1.2 Security Keylock (Optional Feature)
This operator control is a key-operated switch lock. The
key must be inserted in the lock and turned on (horizontal
position) to enable the display station for operation. The
key must remain in the On position to keep the display
station enabled. The key cannot be removed from the lock
unless it is returned to the Off position.
6.1.1.1 OFF-PUSH (Power, Brightness, and Contrast)
The OFF-PUSH switch is a triple-function control that
adjusts the display image brightness and contrast. It also
controls display station power. Pulling the switch out
6.1.1.3 Selector Light-Pen Tip Switch (Optional Feature)
The selector light pen contains a spring-loaded switch in its
tip. The switch is used to select detectable fields on the
Indicators (3)
CRT Bezel
IBM
SYSTEM
AVAILABLE
CRT
INSERT
MODE
INPUT
INHIBITED
OFF·PUSH
OFF-PUSH Switch
(Power/Contrast/Brightness)
Security Key
Diagram 6-1. External Controls and Indicators
Reference Data
6-1
screen by placing the point of the pen on the desired data
field and pushing the barrel of the pen toward the screen.
Removing the tip from the screen turns the switch off
automatically.
spacing between character rows and, thus, determines the
overall height of the displayed image. The ROW SPACI NG
control is not used in Model 1 display stations.
6.1.2.6 TOP MARGIN
6.1.1.4 Audible Alarm Volume (Optional Feature)
The loudness of the audible tone can be adjusted by the
display station operator by turning the audible alarm
volume control. The front cover must be lowered for access
to the control. On Model 1 display stations, the control
protrudes downward from the audible alarm box on the
right side of the base chassis. On Model 2 display stations
the control protrudes frontward from the audible alarm
box on the left side of the upper chassis.
6.1.1.5 Keyboard Audible Response
A knob at the rear of the keyboard bottom plate adjusts
the volume of the keyboard audible response device.
Volume can be adjusted from off (no click when a key is
depressed) to maximum loudness by rotating the knob.
6.1.2 Internal Controls
6.1.2.1 INTEN CRT
This momentary-contact switch is located on the display
station analog card. The switch overrides intensity and
blanking pulses generated by control logic and causes a
complete raster of scan lines to be displayed when pressed.
6.1.2.2 Focus
This control is a screwdriver-adjustable potentiometer
located on the HV power supply. Turning the control varies
the sharpness of the dots that form the characters on the
screen.
6.1.2.3 WIDTH
The WI DTH control is a screwdriver-adjustable potentiometer located on the analog card. Turning this control
varies the horizontal dot-to-dot spacing, which alters the
total width of the displayed image.
6.1.2.4 CHAR HEIGHT
This control is a screwdriver-adjustable potentiometer
located on the analog card. Turning the control varies
vertical dot-to-dot spacing of the displayed image. On the
Model 1 display station, it determines the overall height of
the displayed image.
6.1.2.5 ROW SPACING (Model 2 Display Stations Only)
This control is a screwdriver-adjustable potentiometer
located on the analog card. Turning the control varies
6-2
This control is a screwdriver-adjustable potentiometer
located on the analog card. The control sets the top
reference line on the CRT, from which all other vertical
image adjustments are made. Once the control is set, the
reference line remains stationary during other vertical
character and image adjustments.
6.1.2.7 I mage Tilt
The deflection yoke, mounted on the CRT neck, is used to
tilt the entire displayed image. Rotating the yoke adjusts
the image for squareness with· the edges of the CRT bezel.
6. 1.2.8 Magnetic Centering Rings
The magnetic centering rings are mounted on the CRT
neck, directly behind the deflection yoke. The centering
rings are rotated to position the displayed image about the
geometric center of the CRT.
6~
1.2.9 -12V Supply
This control is a screwdriver-adjustable potentiometer
located on the -12V regulator card. Turning the control sets
the voltage output of the -12V power supply.
6.2 INDICATORS
Display indicators, like controls, are divided into two
categories: external and internal. External indicators are
those that can be seen without removing any machine
covers. To observe internal indicators, covers must be
removed. Internal indicators are accessible only to
maintenance personnel.
6.2.1
External Indicators (Diagram 6-1)
The three external indicators on 3277 Display Stations are
displayed as small boxes (blips) generated by analog
circuitry. They are displayed at the right edge of the CRT.
Each indicator has its function identified by a label on the
CRT bezel, adjacent to the indicator. The brightness of the
indicators is controlled by the Brightness controL
6.2.1.1 SYSTEM AVAILABLE Indicator
This indicator is displayed at character row 4 on Model 1
display stations and at character row 10 on Model 2 display
stations. In remote system configurations, the indicator
sign ifies that the carrier is on and that the transm iss ion
control unit (TCU) is online when lighted. In local system
configurations, the indicator being on signifies that the
channel 'operational out' tag line is active.
6.3.1 Types of Keyboards
6.3.1.1 Typewriter Keyboard
6.2.1.2 INSERT MODE Indicator
This indicator is displayed at character row 6 on Model 1
display stations and at character row 12 on Model 2 display
stations. The indicator lights when the INSERT MODE key
on the keyboard is pressed. It signifies that the display
station is in the Insert mode of operation. The indicator
remains on, and the display station remains in Insert mode
until the RESET key is pressed.
6.2.1.3 INPUT INHIBITED Indicator
This indicator is displayed at character row 8 on Model 1
display stations and at character row 14 on Model 2 display
stations. The lighted indicator signifies that manual input to
the display station from the keyboard, selector light pen,
and Operator Identification Card Reader is ·blocked. The
indicator is extinguished by . program control or by pressing
the RESET key. When the security keylock is off, this
indicator lights.
6.2.2 Internal Indicator (SWEEP INDIC)
The SWEEP INDIC indicator is a neon bulb mounted on
the display station analog card. The lighted indicator
signifies that· the horizontal deflection circuits are operating.
6.2.3 Arc-Suppression Neon
The arc-suppression neon is located on the arc-suppression
board in Model 1 display stations and on the voltage
distribution board in Model 2 display stations. It is not an
,indicator and will never be seen lighted. The two elements
of the neon bulb are connec~ed between de ground (RET)
and th~ display station frame ground. The neon acts as a
momentary short circuit whenever the difference in potential between its two elements would have exceeded approximately 90V. The difference in potential is occasionally
generated by the inherent characteristic of a cathode-ray
tube to arc. Arcing causes transients in the return path of
the tube. Restricting potentials to 90V to ground protects
display station circuitry from possible damage.
6.3 KEYBOARDS (Optional Feature)
Four keyboards are used with 3277 Display Stations.
Keyboards of the same type are interchangeable. among
display stations having keyboard adapter circuitry installed.
EBCDIC is the basic code used on all keyboards.
The typewriter keyboard uses a standard typewriter key
layout of 66 keys. An additional 12 Program Function keys
may be incorporated in the standard typewriter keyboard.
Diagram 6-2 illustrates the typewriter keyboard.
6.3.1.2 Operator Console Keyboard
The operator console keyboard uses an IBM 1052-7 type
key layout with an additional 12 Program Function keys.
Diagram 6-4 illustrates the operator console keyboard.
6.3.1.3 Data Entry Keyboards
The two data entry keyboards use 66 keys, consisting of 36
alphameric keys and 30 control keys. Diagram 6-5 illustrates the two data entry keyboards.
6.3.2 EBCDIC Keyboard Codes
The EBCDIC code is the standard code used with all 3270
system keyboards. Diagram 6-7, Sheet 1, shows the keyboard codes for the typewriter and operator console
keyboards. Characters (and functions) are shown in the
Graphics column as they appear on typewriter keyboard
key tops. The operator console keyboard key layout is
similar. Sheet 2 shows the EBCDIC code arrangement used
on the data entry keyboard( s). Diagrams 6-14 and 6-15
show the codes for unique ASCII and WTC language
characters.
6.4 ASCII OPTIONS
ASCII * character generator and keyboard options may be
present on 3277 Display Stations. ASCII options are
available only in the United States and Canada. The
following paragraphs describe the characteristics of these
options.
6.4.1 ASCII Character Generators (Optional Features)
Two ASCII character generator options allow the ASCII
code set to be displayed. The ASCII code set includes the
symbols [, ], \ , and A which are not used in the 3277
EBCDIC code set. ASCII option A uses the symbols I and
.." while option B substitutes the symbols ! and A
respectively. Each option requires a different character
*ASCII American National Standard Code for Information Interchange, X3.4-1968.
Reference Data
6-3
generator logic card in location K2. Maintenance of the
display station is not affected by the presence of the ASCII
option; however, if logic card K2 must be changed, the
same type number card must be used.
6.4.2 ASCII Keyboards (Optional Features)
Two ASCII typewriter keyboards can be attached to th~
3277 Display Station. They are similar to EBCDIC typewriter keyboards described in paragraph 6.3.1.1, except
unique ASCII characters are included on some key tops. PF
keys 1-12 are included in the 78-key version. AscfI
keyboards are serviced like EBCDIC keyboards, and operationally they are the same. Unique logic cards are not used,
but ASC II character generator option A or B must be
installed to enter and display the unique ASCII characters.
Option A provides the 64 ASCII character set including the
symbols I (logical or) and -, (logical not). Option B
provides the 64 ASCII character set but substitutes !
(exclamation point) for logical or and " (circumflex) for
logical not.
6.5 API.,. OPTIONS
The 3270 Data Analysis - APL Feature expands the number
of different characters and symbols that can be entered and
displayed by the 3277 Display Station, Model 2. A
five-shift APL keyboard (Diagram 6-3) and a new line
buffer and character generator card (0 iagrams 6-16, 6-20,
and 6-21) provide these expanded capabil ities.
The number of data codes necessary to represent the
entire character set available with the 3270 Data Analysis APL Feature is larger than the number of possible data
codes on a standard 3277. (Only seven data bits can be
stored in each character position of the buffers in standard
machines.) The 3270 Data Analysis - APL Feature increases
the number of possible data codes by using the control bit
as an 8th data bit for some characters. Attribute
recqgnition circuits have been modified to distinguish true
attribute characters from those data characters that have
the control bit on.
On 3277 Display Stations with the 3270 Data Analysis APL Feature installed, a character will be recognized to be
a true attribute if:
The Control Bit
AND Bit 1
AND Bit 6
=1
=1
=0
Any other condition of these particular 'bits will be decoded
as data.
6.5.1
Line Buffer and Character Generator Card
The line buffer and character generator card used with the
3270 Data Analysis - APL Feature is capable of storing and
, displaying all standard characters, in addition to symbols
commonly associated with APL. This includes a full
uppercase and lowercase typewriter character set, APL
symbols, an uppercase underscored alphabet, and certain
overstruck symbols. This card also contains the circuitry
that distinguishes true attribute characters from those data
characters that have the control bit on.
6.5.2 APl Keyboard
The APL keyboard is similar to the standard 3277
typewriter keyboard, but has been expanded to provide five
shifts instead of two. One backspace key has been replaced
with the APL ON/OFF key, and the BACKTAB key has
been modified to provide the alternate shift function when
AP L is tu rned on.
The five shifts available from the 3277 APL keyboard
are:
1. Lower (APL off)
Lowercase alphabet, numeric,
and special characters.
Uppercase alphabet and special
2. Upper (APL off)
ch a racte rs.
Uppercase alphabet, numeric,
3. Lower (APL on)
and special characters.
APL symbols and special char4. Upper (APL on)
acters.
Uppercase underscored alphabet
5. Alternate (APL on)
and APL overstruck characters.
See Diagram 6-3 for a layout of the APL keyboard.
the keyboard is initially reset to lower shift (APL off)
by power-on-reset. APL is turned on by a single depression
of the APL ON/OFF key, and will remain on until this key
is pressed again or until a power off-on sequence is
performed. Upper and lower shift entry is controlled by the
SH IFT key, regardless of whether AP L is tu rned on or off.
Alternate shift entry is possible only when APL is turned
on. To enter alternate shift characters, the APL ALT key
must be held down while striking the desired character key.
The APL ALT key reverts to its original function (backtab)
when APL is turned off.
The APL keyboard generates a 9-bit parity code for
each character. The added bit (bit 8) is stored in the
control bit position of the buffers. Refer to 0 iagrams 6-8
through 6-12 for specific character codes. Diagram 7-20
contains APL keyboard pin and terminal locations.
6.5.3 Text Keyboard
The Text Keyboard 'is similar to the standard 3277
typewriter keyboard, but has been expanded to provide five
shifts. The backspace in the top row of keys has been
replaced with the ALTON/OFF keY,and the Test Req key,
the leftmost key in the bottom row, has been replaced with
the CODE key. The ALTON/OFF and CODE keys provide
the additional three shifts. the ALTERNATE mode indicator is located on the keyboard cover just above the ALT
ON/OFF key.
The five shifts that are available from the 3277 Text
keyboard are:
1. Lower (AL T off): Lowercase alphabet, numeric, and
o:;pecial characters.
2. Upper (AL T off): Uppercase alphabet and special
characters.
3. Lower (ALTon): Uppercase alphabet, numeric, and
special characters.
4. Upper (ALTon): Alternate symbols and special characters.
5. Code Key: Special characters on front of keys.
See Diagram 6-6 for TEXT keyboard layout.
When power is turned on, the keyboard will be in
lowercase standard shift. Alternate shift is turned on by a
single depression of the ALT ON/OFF key, and it will
remain on until the key is pressed again. Upper and lower
shift are controlled bytheshift key, regardless of the ALT
ON/OFF key status. CODE shift can be active with
Alternate mode ON or OFF. To enter CODE shift
characters, the CODE must be held depressed while striking
the desired character key.
The text keyboard generates a 9-bit odd parity code for
each character. The added bit (bit 8) is stored in the
control bit position of the buffers. Refer to Diagrams 6-9
and 6-13 for specific character, codes. Diagram 7 -21
contains pin and terminal locations.
6.6 REFERENCE DIAGRAMS
Diagrams 6-16 through 6-23 contain reference data that can
be helpful in maintaining IBM 3277 Display Stations.
Diagram 6-16 Iists all logic cards used in the display station
and describes the function of each card. All logic card I/O
pins used as probe points in the troubleshooting diagrams
(Section 4) are listed in Diagram 6-17. ALD references are
also listed. Logic board jumpering data for the various keyboard feature options is included in Diagram 6-18. Diagram
6-19 shows how characters are encoded in the keyboard
assembly. Diagrams 6-20 and 6-21 show logic card plugging
for the one-half and two-th irds boards, respectively. Logic
board pin identification data is given in Diagram 6-22.
Display station data flow is shown in Diagram 6-23, a foldout page located at the back of this manual.
Reference Data
6-5
~mm.
l2J
L:J
W. . · . l!J
l!J l!0
8 CJ] (@\/i\.mm.CD·(&\
~~
1
CLEAR
~.UP
~
(+\..
U
6
~~~K
FIELD
0G00000800GJGJ@G
§ B00000000GJGJO
@) G000000GOOQJG
( RESET)
)
(
(ENTER )
Diagram 6·2. Typewriter Keyboard
~88~Bee8BBB~~OOB~0~0
BE)BeJBBBB(sB~~~(B) 888
~~B00~~BBB8~~
808
f3B080B~~BB88B
8[3(8
~ ."" I
~
~
("m
~
Legend:
Typomotic Keys
Typomotic Key (APL off)
0
Numeric Key
Not(Js:
1. A through Z are invoked by depressing APL ALT and A through Z.
2. ~ I nvoke;~ when A'PL AL T is depressed ( ~ is not shown on the front
surface of the +' key).
Lowercase, APL off
Uppercase, APL off
Lowercase, APL on
Uppercase, APL on
APL on, APL AL T held down
Diagram 6·3. APL Keyooard - US
6-6
,,,
h
=
H
H
+
x
!::,
.-
H
!il
9
(
9
V
¥
Diagram 6-4. Operator Console Keyboard
8 c:JwGJCDO :~~ GOwBGGG GG
w(iJmrnGJCDGJCDrnwBB @G
Q
~nr>\f:\mA~mmm.
~ ~WWUUWl§jl!iJWl.!SJW
..
r=:::::\nmf"\f=\mmmmm
~
~. ~WWWWWW~ULJ
GF4 r:;:\
~
~
~
( )=:J
Data Entry Keyboard - Keypunch Layout
8 c:JwGJCDCD ~!~: GOwGGG GG
om· r:\f;lnmmmmGr=l r:\G
1+\
Wl'!U
Q
~
VUl!JWUUWWW PF4 ~
~r<:\r>\nmAmmmm
r:;:\
~WWUUWl§jl!iJWl.!SJW
LJ
E
~
DEL
~ r=:::::\(%\m~~mmmmmo~
~ ~wWWWWWlMJULJ
( RESET)
)
Typamatic Keys
(
. ~
(mER)
o N,m,",K,~
Data Entry Keyboard
Diagram 6·5. Data Entry Keyboards
Reference Data
6-7
O
Legend:
Typamatic Keys
Typamatic Key (Std. Mode and Lower case ALT Mode)
Lower (AL T off)
Upper (AL T off)
6-8
Text Feature Keyboard
, ,. ,
!
]
"
/
?
Lower (ALTon)
!
{
Upper (AL Ton)
....,
}
\
?
"l-
I
>
Code Key (AL TonI
Diagram 6-6.
AL T indicator light
(on keyboard cover)
Typewriter and Operator Console Keyboard Codes
Graphic
U
L
o1
Upper Shift
2 345 6 7 P "
o1
Lower Shift
234 5 6 7 P "
000 1 0 1 1 1 1
000 1 0 1 100
000101111
000 1 0 1 100
?
100 1 1 100 1
001011011
000100011
000 1 0 0 000
001100001
100111100
001 1 1 101 0
010000000"
000101010"
000110001"
000110010"
000 1 101 00"
000 1 101 1 1 "
000100110·
000101001
010011110
011111000
011110111
010110110
011011001
010010100
010100001
010111001
010011011
010111010
011011010·
010011101
110110001
111001100
110001011
110110010
111 000 1 1 0
1 1 101 000 1
1 1 1 0 0 1 0 01
1 100 1 001 1
110101100
110101111
010110101
110000010
111000101
1 10 0 0 1 0 0 0
110001101
110001110
110010000
110100011
1 101 001 0 1
1 101 001 1 0
011110100
011111110
1 1 101 001 0
111001111
1 1 000 0 1 1 1
1 1 100 1 010
110000100
110101010
110101001
0100 1 1000
o 1 1 o 1 1 100
o 1 1 0 1 1 111
001011000
00101 101 1
000.100011
000100000
001100001
001011101
00111 101 0
010000000·
o 0 0 1 01010"
000 1 1 000 1 "
000 1 10010*
000 1 10100*
000 1 10111"
o 0 0 1 00110*
000 1 o 1 0 0 1
11 1 .100010
1 1 1 100 1 0 0
1 1 1 100111
1 1 1 1 0 1 000
1 1 1 1 0 1 o 1 1
1 1 1 1 0 1 1 0 1
1 1 1 1 o 1 1 1 0
1 1 1 1 1 0 000
1 1 1 1 1 0 0 1 1
111100001
o 1 1 000 0 0 1 "
011111101
100110000
101001101
1 0 0 001 010
100 1 100 1 1
101000111
101010000
10100 1 000
1 000 1 001 0
100101101
100 1 011 1 0
010111111
100000011
101 000 1 0 0
1 000 0 1 001
10000 1 100
1,00001111
1 000 1 000 1
100 1 000 1 0
100 1 001 0 0
100100111
010111100
011111011
101010011
101001110
100000110
10100 1 011
100000101
100101011
100101000
011010110
010010111
o1 1 0 0 0 0 1 0
PF1
PF2
PF.3
PF4
PF5
PF6
PF7
PF8
PF9
PF10
PF11
PF12
001
001
o0 1
o0 1
o0 1
o0 1
o0 1
001
001
001
001
o0 1
00 1
o0 1
o0 1
001
o0 1
00 1
o0 1
o0 1
o0 1
o0 1
o0 1
o0 1
ERASE INPUT
ERASE EOF
RESET
DUP
CLEAR
INS MODE
DEL
TEST REa
FIELD MARK
ENTER
PA1
PA2
SpacEi
+'
t
+-
(2 Keys)
~
l+-
I
@
#
1
2
3
$
4
%
5
¢
&
6
7
"
8
(
)
-
9
o
+
a
a
E
R
T
Y
U
I
0
P
!
A
S
D
F
E
R
w
G
H
J
w
T
y
U
o
....,P
A
S
D
F
G
H
J
K
L
:
K
L
Z
z
C
C
V
B
N
M
V
B
..
x
<
>
x
N
M
100010
.100100
1 001 1 1
1 o 1 000
1 o 1 o 1 1
1 o 1 1 0 1
1 o 1 1 1 0
1 1 0000
1 1 0 0 1 1
1 1 o 1 0 1
1 1 o 1 1 0
1 1 1 001
1 000 1 0
100 1 0 0
1 o0 1 1 1
1 o 1 000
1 0 1 0 1 1
1 0 1 1 0 1
1 o 1 1 1 0
1 10000
1 1 0 0 1 1
1 1 0 1 0 1
1 1 0 1 1 0
111001
*Typamatlc Key
Notes:
1. Typewriter Keyboard button layout used. Character codes are same on both keyboards.
2. Use Diagram 6-15 to determine the codes for unique ASCII and WTC language characters.
Diagram 6-7. USA EBCDIC Keyboard Codes (Sheet 1 of 2)
Reference Data
6-9
Data Entry Keyboard Codes
Graphic
U
Upper Shift
L
o0
o0
ERASE INPUT
ERASEEOF
RESET
PA1
CLEAR
INS MODE
DEL
TESTREQ
PA2
ENTER
O. 1 0 1 1 1.1
01 0 1 1 0 0
00 1 0 1 1 0 00
o 0 1011 0 1 .1
000100011
000100000
001100001
001011101
00111 101 0
o 1 0 0 0 0 00 0 •
o 00 1 0 0 1 1 0 •
100 1 1 100 1
Space
SKIP
DUP
o O~
+'
t
'"
~
+-
·0 1 2.34 567 P •
(2 Keys)
~
~
PA3
@
#
$
o
I
+
Q
W
E
R
T
Y
U
I
1
2
3
o
&
P
<
>
A
S
D
...,I
F
G
H
J
K
L
¢
4
5
6
%
Z
?
X
C
V
(
)
B
N
M
7
8
9
PF1
PF2
PF3
PF4
PF5
FIELD MARK
1 010 1 0 •
000110001·
000 1 100 1 0 •
000110100·
000 1 101 1 1 •
000100110·
000 1 0 1 001
001.010111
o 1 000 000 0
o 1 0 0000 0 0
011010110
o 1 001 0 1 1 1
111100001
o 1 0 01 1 1 0 1
011011010
o 1 0 1 101 0 1
o 1 1 1 101 0 0
o 1 0 1 1 1 100
011111101
1 1 1 1 000 1 0
1 1 1 1 00 1 0 0
111100111
o 1 0 1 0 '0 0 0 1
o 1 001 1 000
011011100
o 1 0 0 00 0 0 0
o 1 001 1 1 1 0
010111111
o 1 001 0 1 0 0
111 1 0 1 000
111101011
111101101
011011001
011011111
011111011
011111110
010011011
010111010
111101110
111110000
1 1 1 1 1 0 0 1. 1
010010111
011000001
001 100 0 1 0
001100100
001 100 1 1 1
001101000
o0
1 1 0 1 0 " 1
10011 1 100
Lower Shift
01234567p·
000101111
000101100
001011000
001011011
000100011
o O~ 1 00000
001100001
001011101
001111010
o 1 0 0 00 0 0 0 "
000100110"
100111001
000 1 0 1 0 1 0 ".
000110001·
000110010"
000110100"
000 1 101 1 1 "
000100110"
000101001
001010111
o 1 1 1 1 100 0
011110111
010111001
o 1 0 1 10 11 0
011000010
110110001
111001100
110001011
110110010
111000110
111010001
111001001
110010011
110101100
110101111
110000010
111000101
110001000
110001101
110001110
110010000
110100011
110100101
110100110
111010010
111001111
110000111
111001010
110000100
110101010
110101001
011010110
010010111
o 1 001 011 1
011000001
001100010
001100100
001100111
001101000
001101011
100111100
*Typamatic key
Note: Use Diagram 6-14 to determine the codes for unique WTC language characters.
Diagram 6-7.
6-10
USA EBCDIC Keyboard Codes (Sheet 2 of 2)
APL Typewriter Keyboard Codes - APL Off
Upper Shift
Graphic
Upper
Lower
o
1 2 3 4 5 6 7 8 P •
Lower Shift
o
1 234 5 678 P "
0001011101
000 1 0 1 1 000
0001011101
000 1 0 1 1 000
?
1001110001
0010110101
000 1 000 1 0 1
000 1 0 0 0 0 0 0
001 100 0 001
1001111000
0011110100
o 1 0 0 0 0 0 000 •
000 1 0 1 0 1 0 0 '
000 1 1 0 0 001 •
000 1 100 1 00"
000 1 101 000 •
0001101101"
000 1 001 100 *
000 1 0 1 000 1
0100111100
0111110000
o1 1 1 10 1 10 1
0101101100
0110110001
o 1 001 0 1 000
o10 10 0 0 0 0 1
0101110001
0100110101
0101110100
0110110100'
0100111001
1101100001
1110011000
1100010101
1101100100
1110001100
1110100001
1110010001
1100100101
1101011000
1 1 0 1 0 1 1 1 0 1
0101101001
1 1 0 000 0 1 0 0
1110001001
1 1 000 1 0 0 0 0
1100011001
1100011100
1 100 1 0 0 0 0 0
1101000101
1101001001
1101001100
0111101000
o 1 1 1 1 1 1 1 0 0
1110100100
1 1 1 0 0 1 1 1 0 1
1100001101
1110010100
1 1 000 0 1 000
1101010100
1101010001
o 1 001 1 000 1
0110111000
o1 10 1 1 1 10 1
00101 1 000 0
0010110101
000 1 000 1 0 1
000 1 0 0 0 0 0 0
001 100 000 1
0010111001
0011110100
o 1 0 000 0 0 0 0 '
000 1 0 1 0 1 00*
000 1 1 000 0 1 •
000 1 100 1 00*
000 1 1 0 1 000 *
0001101101*
000 1 001 100 *
000 1 0 1 000 1 .
1 1 1 1 0 00 1 0 0
1111001000
1 1 1 1 0 0 1 1 0 1
1111010000
1 1 1 1 0 1 0 1 0 1
1 1 1 1 0 1 1 0 0 1
1 1 1 1 0 1 1 1 0 0
1111100000
1 1 1 1 1 0 0 1 0 1
1111000001
o 1 1 000 0 0 0 1 •
o1 1 1 1 1 10 0 1
100 1 1 0 0 0 0 0
1 0 1 0 0 1 10 0 1
1 0 0 0 0 1 0 1 0 0
1001100101
1010001101
1 0 1 0 1 0 0 00 0
10100 1 0 0 0 0
1000100 1 0 0
1001011001
1001011100
o10 1 1 1 1 10 1
1 0 0 0 0 0 0 1 0 1
101 000 1 000
10000 1 000 1
1 0 0 0 0 1 100 0
1000011101
1 000 1 0 0 001
100 1 000 1 0 0
100 1 001 000
1001001101
o1 0 1 1 1 1 00 1
o 1 1 1 1 1 0 10 1
1 0 1 0 1 0 0 1 0'1
1010011100
100 000 1 100
1010010101
100000100 1
1001010101
100 1 0 1 000 0
0110101100
0100101101
o1 10 0 0 0 10 0
PFl
PF2
PF3
PF4
PF5
PF6
PF7
PF8
PF9
PF10
PF11
PF12
001 100 0 1 0 0
001 100 1 000
0011001101
001 101 000 0
0011010101
0011011001
0011011100
001 1 1 0 0 000
0011100101
0011101001
0011101100
0011110001
001 1 000 1 00
0 1 1 0 0 1 0 00
0011001101
001 101 000 0
0011010101
0011011001
0011011100
0011100000
0011100101
0011101001
0011101100
0011110001
ERASE INPUT
ERASE EOF
RESET
DUP
CLEAR
INS MODE
DEL
TEST REQ
FIELD MARK
ENTER
Space
PA1
PA2
t
+
-+
+-71
l+-
I
1
@
#
2
3
$
4
%
5
6
¢
&
7
8
9
o
+
Q
Q
W
W
E
E
R
R
T
T
Y
U
I
Y
U
I
o
o
P
I
A
-.A
S
D
F
G
H
P
S
D
F
G
H
J
J
K
L
K
L
z
z
X
C
V
B
N
M
<
>
X
C
V
B
N
M
o
*Typamatic Key
Diagram 6-8. APL Modified EBCDIC Keyboard Codes (Sheet 1 of 2)
Reference Data
6-11
APL Typewriter Keyboard Codes - APL ON
Graphic
Upper
ERASE INPUT
ERASE EOF
RESET
DUP
CLEAR
INS MODE
DEL
TEST REO
FIELD MARK
ENTER
Lower
PA1
PA2
Space
+-'
t
+
-+
+-+1
~PL
Alternate
o
1 234 5 6 7 8 P
o
0001011101
000 1 0 1 1 000
0001011101
000 1 0 1 1 000
1001110001
0010110101
000 1 000 1 0 1
000 1 000 000
001 100 000 1
1001111000
0011110100
o 1 0 0 0 0 0 0 0 0*
o 0 0 1 0 1 0 1 0 0*
000 1 1 0 0 0 0 1*
o 0 0 1 1 0 0 1 0 0*
o 0 0 1 1 0 1 0 0 0*
o 0 0 1 1 0 1 1 0 1*
o 0 0 1 0 0 1 1 0 0*
00101 1 0 0 0 0
0010110101
000 1 000 1 0 1
000 1 0 0 0 0 0 0
001 100 0 001
0010111001
0011110100
o10 0 0 0 0 0 0 0
000 1 0 1 0 1 0 0
000 1 1 0 0 001
000 1 100 1 0 0
000 1 101 000
0001101101
000 1 001 100
1100001110
101 0 0 0 0 001
o 1 001 1 0 0 0 0
1 000 1 100 0 0
o1 1 1 1 1 1 0 0 1
1010111000
0110111000
1 0 1 1 1 1 1 0 0 1
o1 1 0 10 1 1 1 1
0110101010
o 1 1 000 0 0 0 1
1011100001
o1 1 0 1 1 1 1 0 1
1011010001
1011000101
1011001100
o1 1 1 10 1 1 10
1 000 1 0 1 000
1100001011
1011001001
1001110100
0101110001
1000111100
101 1 000 000
1000110101
1000111001
0110110100
1011101000
1 0 1 1 1 0 1 1 0 1
1 0 1 0 1 1 1 1 0 1
o1 1 1 1 1 0 1 0 1
100 1 0 0 000 1
0100110101
01011t0100
1001101100
1001101001
1010101001
1010101100
1010110001
1011110000
1 0 1 1 1 1 1 1 0 0
0101111000
o1 1 1 1 1 0 1 0 0
1 0 1 1 0 1 1 1 0 1
1111000100
1111001000
1 1 1 1 0 0 1 1 0 1
1111010000
1 1 1 1 0 1 0 1 0 1
1 1 1 1 0 1 1 0 0 1
1 1 1 1 0 1 1 1 0 0
1111100000
1 1 1 1 1 0 0 1 0 1
1111000001
0100111001
1011011000
1101100001
1110011000
1100010101
1101100100
1110001100
1110100001
1110010001
1100100101
1101011000
1 1 0 1 0 1 1 1 0 1
1 0 1 0 1 1 1 1 0 1
1 1 0 000 0 1 0 0
1110001001
1 1 000 1 000 0
1100011001
1100011100
1 100 1 0 0 0 0 0
1101000101
1101001001
1101001100
1010110100
1 0 1 1 1 1 0 1 0 1
1110100100
1 1 1 0 0 1 1 1 0 1
1100001101
111001010\)
1 1 000 0 1 000
1101010100
1101010001
0110101100
0100101101
o 1 100 0 0 1 0 0
001 100 0 1 0 0
o 0 1 1 00 1 0 0 0
0011001101
001 101 0 000
0011010101
0011011001
0011011100
001 1 1 000 0 0
001 1 1,0 0 1 0 1
0011101001
0011101100
0011110001
001 100 0 1 0 0
001 100 1 000
0011001101
001 101 0 0 0 0
0011010101
0011011001
0011011100
001 1 1 0 0 0 0 0
0011100101
0011101001
0011101100
0011110001
o1
2 345 6 7 8 P
1 1 1 1 0 0 1 1 1 0
ALT
1
<
S
2
3
4
5
6
7
8
9
o
+
x
?
w
(.
o
W
E
p
R
t
T
Y
+
U
1
I
o
*
P
a
A
S
L
D
\J
II
G
-+
r
F
o
(
)
C
H
J
K
L
[
1
z
-::J
X
n
U
C
V
~
B
T
N
I
M
\
/
PF1
PF2
PF3
PF4
PF5
PF6
PF7
PF8
PF9
PF10
PF11
PF12
*Typamatic Key
Diagram 6-8. APL Modified EBCDIC Keyboard Codes (Sheet 2 of 2)
6-12
1 234 5 6 7 8 P
1101001010
1100011010
1 1 0 1 0 1 1 0 1 1
1 1 0 1 0 1 1 1 1 0
0100111010
o1 0 0 1 1 1 1 1 1
1110001010
1 1 0 0 0 1 1 1 1 1
0100101110
0100101011
1 1 0 1 0 0 1 1 1 1
1 1 1 0 0 0 1 1 1 1
1001100011
10100 1 101 0
1000010111
1001100110
1010001110
1010100011
1010010011
1000100111
100 1 0 1 101 0
1 0 0 1 0 1 1 1 1 1
0101101010
1 0 0 0 000 1 1 0
1010001011
1 000 0 1 001 0
1000011011
1000011110
1 000 1 000 1 0
1001000111
1001001011
1001001110
1 1 1 0 0 1 1 1 1 0
1 1 1 0 0 1 1 0 1 1
1010100 1 1 0
1 0 1 0 0 1 1 1 1 1
1000001111
1010010110
1 0 0 0 0 0 1 010
1001010110
1001010011
o1 0 1 1 0 1 1 1 1
o1 0 1 1 1 1 1 1 0
o1 0 1 1 1 1 0 1 1
Text Typewriter Keyboard Codes· Alt_nate OFF
Upper
Lower
ERASE INPUT
ERASE EOF
RESET
DUP
CLEAR
INS MODE
DEL
TEST REO
FIELD MARK
ENTER
Space
PAl
PA2
+'00
t
1-+
+-M
~
I
@
#
$
1
2
3
4
%
5
4
6
7
&
8
9
o
+
a
a
w
w
E
E
R
T
Y
R
T
Y
U
I
U
o
o
P
P
I
]
!
A
A
S
D
F
S
G
H
G
J
J
K
L
K
l
z
x
c
D
F
H
z
x
c
B
V
B
N
M
N
M
V
PFl
PF2
PF3
PF4
PF5
PF6
PF7
PF8
PF9
PF10
PFll
PF12
Lower Shift
Upper Shift
Graphic
*
012345678P*
o
000 1 011 101
000 1 0 1 1 000
000 1 0 1 1 101
000 1 0 1 1 000
1001110001
00101 101 0 1
000 1 000 1 0 1
000 1 000 0 0 0
001 1 000 001
10011 1 1 000
00111 101 0 0
0100000000*
000 1 0 1 0 1 0 0
000110000:,1 *
000 1 1 00 1 00*'
o 0 0 1 1 0 1 0 0 0 *'
000 1 101 101 *
000 1 0 0 1 1 00*
000 1 0 1 000 1
o 1 0 0 1 1 11 0 0
o1 1 1 1 10 0 00
o 1 1 1 1 0 11 01
o 1 0 1 101 100
~ 1 101 lob 0 1
10101 101 0 0
o 1 0 1 0 0 0 pOl
o 1 0 1 1 1 000 1
o 1 001 1 0 1 0 1
o10 1 1 10 10 0
0110110100*
o 1 001 1 1 ~ 0 1
1 1 0 1 1 0 0'0 0 1
1110011000
1 1 000 1 0 1 0 1
1 101 100 1 0 0
1 1 1 000 1 100
1 1 101 0 0 001
111001000'1
1 100 1 0 0 1 0 1
1 101 0 1 100 0
1 1 0 1 0 1 1 1 0 1
1 0 1 1 1 1 01 0 1
1 1 0 0 000 1 0 0
1110001001
1 1 D 0 0 1 000 0
1 1 0 0 0 1 1 0 01
1 1 000 1 1 100
1 100 1 0 000 0
1 1 0 1 000 1 0 1
1 101 001 001
1 101 001 100
o 1 1 1 101 000
a 1 1 1 1 1 1 1 00
1 1 101 0 0 1 0 0
1 1 1 a a 11 1 0 1
1100001101
1 1 100 1 0 100
1 1 0 0 a a 1 000
1 1 0 , Q 1 a '1 0 0
11 0 1 0 1 a 0 0 '1
o 1 101 0 1 100
o 1 001 0 1 101
o1 10 1 1 1 10 1
00101 1 a a 0 a
a 0 l' a 1 1 a 1 0 1
000 1 a 0 a 1 0 1
000 1 a a 0 a 00.
001 100 0 001
0010111001
0011110100
a 1 0 0 aa0 a0 a*
000 1 a 1 0 1 a 0
a0 0 " 1a0 a0 1*
a a a 1 1 0 0' 1 a 0 &
000 1'1 a 10 0 a *
000 1 101 101 *
000 1 001 100 *
000 1 a 1 a 0 a 1
1111000100
1111001000
1 1 1 1 0 0 1 1 a 1
1'111010000
1 1 1 10 1 a 1 a 1
1 1 1 1 0 1 1 0 0 1
1 1 1 1 0 1 1 1 a 0
1111100000
1 1 1 1 1 o. a 1 a 1 "
1.111000001
a 1 100 a a 0 a 1 *
a1 1 1 1 1 10a1
100 1 100 0 a a
1010011001
1 1 1 a 1 a ,1
1010100101
1010011100
1 a a a 001 100
1010010101
1 0 a a 001 0 a 1
1 001 0 1 010 1
100 f 0 1 000 0
o 1 1 0 l' 0 1 1 0 0
o 1 001 0 1 101
o 1 1 0 0 0 0 100
001 100 0 100
001 100 1 000
0011001101
001 101 0 000
0011010101
0011011001
0011011100
00 1 1 1 0 0 a a 0
0011100101
001 1 101 001
0011101100
0011110001
001 1 000 100
o 0 1 1 0 O' 1 0 '0 0
0011001101
a 0 1 t Q 1 0 0 0 0,
001 101 0 1 0 1
0011011001
0011011100,
o 0 1 1 l' 0 0" 0 0 0
0011100101
001 1 101 001
0011101100
o 0 1 1 1 1:0 0 0 1
1
1 234 5 6 7 8 P
a
0
aa
1 a
6a
O. a a 1
100 1 t
1
a
1
1
1
1
aa
a 1
a1
1016100 000
10100 1 a 0 a 9
100 a 1
a 100
1 a a 1 0,.1 1 0 0 1
1001011100
0,1,0 1 1 0 1 001
1 0 0 0 0 0 a 1 0 1
101 0 a a 1 000
1 a 0 a a 1 000 1
10000 1 100 a
1000011101
1 000 1 0 000 1
100 1 000 100
100 1 001 000
1001001101
a
o1a
a1 1
1 1 1 1
aa
1
* Typamatic Key
Diagram 6-9.
Text Keyboard Codes (EBCDIC) (Sheet 1 of 2)
Reference Data
6-13
Text Typewriter Keyboard Codes· Alternate ON
Graphic
Upper
Lower
ERASE INPUT
ERASE EOF
RESET
DUP
CLEAR
INS MODE
DEL
TEST REO
FIELD MARK
ENTER
Space
Upper
Code
PAl
PA2
...-J1i]
t
.j.
o1
Lower
2 3 4 56 7 8 P
012345678P
0001011101
0001011000
0001011101
0001011000
1001110001
0010110101
0001000101
0001000000*
0011000001
1001111000
0011110100
0100000000*
0001010100
0001100001*
00 0 1 1 0 0 1 0 0*
00 0 1 1 0 1 0 0 0*
0001101101*
o 0 0 1 0 0 1 1 0 0*
0001010001
0010.110000
0010110101
0001000101
o 0 0 1 0 0 0 0 0 0*
0011000001
0010111001
0011110100
o 1 0 0 0 0 0 0 0 0*
0001010100
0001100001*
o 0 0 1 1 0 0 1 0 0*
00 0 1 1 0 1 000*
0001101101*
0001001100*
0001010001
1011000110
1011001010
1 0 1 1 00 1 1 1 1
1011010010
1 0 1 1 0 1 0 1 1 1
1 0 1 1 0 1 1 0 1 1
1 0 1 1 0 1 1 1 1 0
1011100010
1 0 1 1 1 0 0 1 1 1
1011000011
1000110011
1000111010
1101100001
1110011000
1100010101
1101100100
1110001100
1110100001
1110010001
1100100101
1101011000
1 1 0 1 0 1 1 1 0 1
01 0 1 1 1 1 1 0 1
1100000100
1110001001
1100010000
1100011001
1100011100
1100100000
1101000101
1101001001
1101001100
0111101000
1001000010
1110100100
1 1 1 0 0 1 1 1 0 1
1100001101
1110010100
1100001000
1101010100
1101010001
o 1 1 0 1 0 1 1 0 0*
0100101101
o1 1 0 1 1 1 1 0 1
0011000100
0011001000
0011001101
0011010000
0011010101
0011011001
0011011100
0011100000
0011100101
o 0 1 1 1 0 1 00 1
o 0 1 1 1 0 1 10'0
0011110001
1111000100
1111001000
1 1 1 1 00 1 1 0 1
1111010000
1 1 1 1 0 1 0 1 0 1
1 1 1 1 0 1 1 00 1
1 1 1 1 0 1 1 1 00
1111100000
1 1 1 1 1 0 0 1 0 1
1111000001
1 0 1 1 1 1 1 1 1 1*
1 0 1 1 1 1 1 001
1001100000
1010011001
1000010100
1001100101
1010001101
1010100000
1010010000
1000100100
1001011001
1001011100
0101101001
1000000101
1010001000
1000010001
1000011000
1000011101
1000100001
1001000100
1001001000
1001001101
o 1 0 1 1 1 1 001
1010000010
1010100101
1010011100
1000001100
1010010101
1000001001
1001010101
1001010000
o 1 1 0 1 0 1 1 0 0*
o 1 0 0 1 0 11 0 1
o1 10 1 1 1 10 1
0011000100
0011001000
0011001101
0011010000
0011010101
0011011001
0011011100
o 0 1 1 1 0 00 0 0
0011100101
0011101001
0011101100
0011110001
Code
012345678P
1110001100
0001010100
1 1 1 0 0 1 1 0 1 1
1 1 1 001 1 1 1 0
ALT
1
2
3
4
5
6
7
1
2
3
1
2
3
I
4
5
[J
6
~
7
t
8
9
8
.j.
9
(
o
o
+
t-
a
w
O
W
E
R
T
y
E
R
T
y
I
U
I
o
o
U
P
!
)
o
±
I
...,T
1\
v
r
l
Q
'if
A
A
f-
S
S
t
D
F
J
D
F
G
H
J
K
L
K
L
G
H
-i
6
52
}
x
z
x
C
C
Z
V
V
B
N
M
B
N
M
?
\
n
<
~
~
PFI
PF2
PF3
PF4
PF5
PF6
PF7
PF8
PF9
PF10
PF11
PF12
>
* Typamatic Key
Diagram 6·9. Text Keyboard Codes (EBCDIC) (Sheet 2 of 2)
6·14
1000101011
1001101010
1010101010
o10 0 1 1 1 10 1
1001000001
0100101000
1000101000
1100001011
1000110110
1 0 0 1 1 1 0 1 1 0
1010000111
1 0 0 1 1 1 1 0 1 1
1010110010
1 0 1 1 1 1 0 1 1 0
1 0 1 1 1 1 0 0 1 1
0110101010
o1 10 10 1 1 1 1
1 001 1 1 1 1 0 1
1000111100
1000110101
1000111001
1 1 1 1 0 0 1 1 1 0
1100011010
1 0 1 0 1 1 0 1 1 1
1 000 1 1 1 1 1 1
1 0 1 0 1 1 1 0 1 1
1 0 1 1 1 0 1 1 0 1
1011101000
o 1 1 1 1 1 1 001
1 0 1 1 0 1 1 1 1 0
1 0 1 1 0 1 1 0 1 1
1 00 1 1 0 1 1 1 1
o1 0 1 1 1 1 1 1 0
o10 1 1 1 10 1 1
1 0 1 0 1 0 1 1 1 1
1 0 1 1 1 1 1 0 1 0
1 0 1 1 1 0 1 1 1 0
1 1 000 1 1 1 1 1
1 01 0 1 1 1 1 1 0
1 0 11 1 0 1 0 1 1
0100110000
1000110000
1010111000
0110111000
First
Hex
Char
Second
Hex
Char.
CONTROL BIT
BIT 8
= 0)
Bits
_0,1
00
Hex
1
Bits
4567
= o (KEYBOARD
01
10
11
00
01
10
11
00
01
10
11
00
01
10
11
00
01
10
11
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
_2,3
- . - - Hex 0
J
0000
0
DEL
TEST
REO
0001
1
INS
MODE
PF 1
0010
2
0011
3
0100
4
0101
5
0110
6
0111
7
1000
8
1001
9
1010
A
1011
B
1100
C
0
&
SP
A
J
s
B
K
S
2
I
t
C
L
T
3
d
m
u
D
M
U
4
PF 5
e
n
v
E
N
V
5
ERASE
EOF
PF 6
f
0
w
F
0
W
6
ERASE
INP
PF 7
g
p
x
G
P
X
7
t
PF 8
h
q
y
H
0
"Y
8
-t
PF 9
i
r
z
I
R
Z
9
/
a
j
PF 2
b
k
PF 3
c
K-
PF 4
~
---I
PF 10
--+-
~
PF 11
PA 1
1101
D
CLEAR
1110
E
PA 2
1111
F
PF 12
ENT
<
!
:
$
#
*
%
@
<
DUP
,
(
)
-
+
;
>
=
-,
?
"
I
1
FM
Note: The 66-key APL keyboard does not include codes 31 through 3C (PF 1 through PF 12).
Diagram 6-10. 3277 APL Keyboard Codes with APL Turned Off
Reference Data
6-15
First
Hex
Char
Second
Hex
Char
00
Hex
1
Bits
4567
0000
=0
OONTROLBIT
.
= 0)
(KEYBOARD BIT 8
01
10
Bits
0,1
11
00
01
10
11
00
01
10
11
00
01
10
11
00
01
10
11
2,3
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
Hex 0
0
DEL
TEST
REO
0001
1
INS
MODE
PF 1
0010
2
0011
3
r-
SP
r-
111"'0
Ira
0
•
~
E
A
1
B
P
C
/
•
~
PF 2
r-
PF 3
~
~
w
0100
4
APL
ALT
PF 4
0101
5
I+'
PF 5
0110
6
ERASE
EOF
PF 6
x
0111
7
ERASE
INP
PF 7
r\
D
E
F
•
8
t
PF 8
1001
9
+
PF 9
-+
.
1010
1011
A
B
.-
I""'"
PF 10
PF 11
+-
•
1111"'"
1111"'"
·1100
1101
C
D
1110
E
1111
F
Notes:
CLEAR
PA 2
. PF 12
,...
<
~
(
ENT
.
+
*
)
III"'"
•
;
.
III"'"
I""
I'"
I""
III"'"
>
,..
,..
t
,...
r-
c
::;;
=
r-
,...
,...
I
DUP
[
~
L
FM
-+
+-
III"'"
?
/'-,
r-
::::
~
3277 APL Keyboard Codes with APL Turned On (Sheet 1 of 2)
T
1.
0
•
I
~
u
~
I
H
... \j
n
:J
The 66-key APL keyboard does not include codes 31 through 3C (PF1 through PF 12).
. Graphic f::. associated with code 1-F3 not shown on key; see Diagram 6-3.
~
denotes uppercase only.
•
denotes lowercase only.
•
denotes alternate case only.
Diagram 6-11.
6-16
PA 1
'
:
I'"
0
•
1
~
:;t.
,...
I
•
• •
• • •
• • •
• • •
• •V•
K
S
2
L
T
3
M
U
4
N
0
W
5
•
•
•
•
•
6
• • • •
G
~
1000
1
J
P
X
7
• • • •
a
• • • •
Z •
•
•
y
R •
8
9
First
Hex
Char.
Second
Hex
Char.
CONTROL BIT
= 1 (KEYBOARD BIT 8 = 1)
0
00
01
10
Bits
"'--0,1
11
Hex
1
00
01
10
11
00
01
10
11
00
01
10
11
00
01
10
11
Bits
4567
~
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0000
0
0001
1
-A
0010
2
[
0011
3
C
0100
4
-D
0101
5
E
. - - HexO
•
•
J
•
•
-
•
•
-
1$
-L
•
M•
-T
-
-U
•
6
0111
7
G
1000
8
H
1001
9
•
B
1100
C
1101
D
1110
E
1111
F
Notes:
•
-
-
P
-
-
",.
",."
I
~
Pi
•
•
iSt
,
¢
f
•
"
V
-
I
~.
!
•
",.
~f·
•
•
1/
®
-
~
•
e
iii
Q)
•
!J.
•
•
•
m
•
•
Q
.l1li""'"
.~
V
X
-
•
1011
•
•
V
N
•
~
i-
• w•
-F
-0
• •
•
0110
A
•
§
•
1010
'--2,3
Y
-
•
•
-R -Z
~
'"
•
•
The 66-key APL keyboard does not include codes 31 through 3C (PF 1 through PF 12).
Graphic Q associated with code 1-F3 not shown on key; see Diagram 6-3.
l1li""'" denotes uppercase only .
• denotes lowercase only .
• denotes alternate case only.
Diagram 6-11. 3277 APL Keyboard Codes with APL Turned On (Sheet 2 of 2)
Reference Data
6-17
First
Hex
Char.
Second
Hex
Char
CONTROL BIT
Hex
Bits
(KEYBOARD BIT 8
~
01
10
~0.1
11
00
0,
10
11
00
01
10
11
00
01
10
11
00
01
10
11
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
~2.3
-'--HexO
0000
0
DEL
TEST
REO
0001
1
INS
MODE
PF 1
0010
2
0011
3
0100
4
0101
5
0110
6
0111
7
1000
8
1001
9
1010
A
SP
&
-
0
/
a
j
PF 2
b
k
PF 3
c
K-
PF 4
I+'
-
(J,
E
A
J
s
l
B
K
S
2
I
t
P
C
L
T
3
d
m
u
W
D
M
U
4
PF 5
e
n
v
E
N
V
5
ERASE
EOF
PF 6
f
0
w
x
F
0
W
6
ERASE
INP
PF 7
9
P
x
\
G
P
X
7
t
PF 8
h
q
y
0"
H
0
Y
8
+
PF 9
i
r
z
I
R
Z
9
-+
PF 10
t
::J
n
\j
c
u
A
-+1
,-
c
!
:
$
#
1011
B
1100
C
PA 1
PF 12
<
*
1101
D
CLEAR
ENT
(
)
1110
E
PA 2
+
;
1111
F
PF 11
I
@
::;
DUP
.1
T
I
r
0
[
]
>
=
L
FM
2
7!
?
"
-+
+-
0
I
%
-
Diagram 6-12. 3277 APL Keyboard Codes - US EBCDIC (Sheet 1 of 2)
6-18
= 0)
Bits
00
4567
=0
1
First
Hex
Char.
Second
Hex
Char.
CONTROL BIT = 1 (KEYBOARD BIT 8
Bits
01
00
Bits
4567
10
~0,1
11
Hex
1
00
01
10
11
00
01
10
11
00
01
10
11
00
01
10
11
~
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
_2,3
........ HexO
0000
0
0001
1
~
::!
0010
2
~
!5
~
0011
3
£
!::.
I
0100
4
Q
M
\!
0101
5
E
-
N
Y.
0110
6
-F
2
0111
7
~
1000
8
1001
9
1010
A
'"f.
~
1\
1011
B
V
~
V
1100
C
1101
D
1110
E
¢
I-
1111
F
Q
\:
Notes:
=1)
+
..
I
e
!
Ii]
w
-
'9
't
ID
-
H
9
~
.!..
~
~
~
/"
~
The 66-key typewriter keyboard does not include codes 31 through 3C (PF 1 through PF 121.
Graphic 11. associated with code l-Hex F3 not shown on key; see Diagram 6-3.
Diagram 6-12. 3277 APL Keyboard Codes - US EBCDIC (Sheet 2 of 2)
Reference Data
6-19
First
Hex
Char
Second
Hex
Char.
CONTROL BIT
=0
(KEYBOARD BIT 8
= 0)
"'II---
00
01
10
11
Hex
1
00
01
10
11
00
01
10
11
00
01
10
11
00
01
10
11
Bits
4567
l
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0000
0
DEL
TEST
REO
0001
1
INS
MODE
PF 1
0010
2
0011
3
0100
4
0101
5
0110
6
0111
7
1000
8
t
1001
9
1010
A
1011
B
1100
C
1101
1110
1111
SP
-
&
0
0
/
a
j
PF 2
b
k
PF 3
c
K-
PF 4
+-'
J
s
B
K
S
2
I
t
C
L
T
3
d
m
u
D
M
U
4
PF 5
e
n
v
E
N
V
5
ERASE
EOF
PF 6
f
0
w
F
0
W
6
ERASE
INP
PF 7
9
P
x
G
P
X
7
PF 8
h
q
Y
H
a
Y
8
-j.
PF 9
i
r
z
I
R
Z
9
-+
PF 10
¢
!
:
PF 11
.
$
PA 1
PF 12
<
.
#
%
@
~
D
CLl;AR
ENT
(
)
-
I
r
E
PA 2
+
;
>
-
L
FM
I
...,
?
"
"""*
*-
-+I
+-
.
F
t
Fe~ture Keyboar~
Codes - US EBCDIC (Sheet 1 of 2)
\
\}
~
Note: The 66-key APL keyboard does not include codes 31 through 3C (PF 1 through PF 12).
6·20
_2,3
~HexO
A
Diagram 6·13. Text
Bits
0,1
DUP
[
]
2
f
I
1
First
Hex
Char
Second
Hex
CONTROL BIT
= 1 (KEYBOARD
BIT 8
= 11)
Bits
Char
Hex
11
10
01
00
00
01
10
11
00
01
10
11
00
01
10
11
00
01
10
11
0
1
2
3
4
5
6
7
8
9
A
B
C
0
E
F
1
Bits
4567
t
0000
0
0001
1
0010
2
0011
,
-
,
0
0
1
\
.J
-
2
4
0101
5
0110
6
0111
7
1000
8
1001
9
1010
A
1\
1011
B
v
C
1101
D
Hex 0
tB
~
4
0100
1100
2,3
---
T
3
3
-
0,1
5
6
""Q
7
~
t
~
~
cp
8
9
1
n
-
"
n
3
2
L
.J
r
.,
(
)
i-
T
+
-j
...L
-
.
1110
E
I
+
1111
F
\
+
-
-
Diagram 6·13. Text Feature Keyboard Codes - US EBCDIC (Sheet 2 of 2)
Reference Data
6·21
Language
USA
EBCDIC
Austrian!
German
Belgian!
French
Danish!
Norwegian
Finnish!
Swedish
Italian
Portuguese
United
Kingdom
Spanish
Keyboard
Code
01234567P
"-
Jl.
Jl.
Jl.
$
$
#
#
k
A
A:,
A
#
#
9
9
'0
'0
0
0
@
j2j
j2j
0
a
@
A
@
X5A
!
!
X5A
X5A
Jl.
Jl.
.
..
X7F,
X7F
A:,
A
..
..
4
4
X5A
X4A
0
4
j2j
U
Key
Graphic
$
$
Key
Graphic
#
#
Key
Graphic
@
@
Key
Graphic
!
!
U
Key
Graphic
Key
Graphic
A
A
..
..
X7F
A
t
X4A
0
4
Diagram 6-14.
Language
U
$
$
@
!
!
¢
A
X5A
9
X7F
Pts
Pt
.f.
.f.
010110110
N
N
#
#
011110111
@
@
011111000
@
@
!
!
!
!
010110101
N
"
..
01 1 1 1 1 1 10
¢
$
$
010010100
N
'0
X4A
A
¢
WTC Language Keyboard Codes (Data Entry Keyboard)
USA
EBCDIC
USA
ASCII-A
USA
ASCII-B
Austrian!
German
Belgian!
French
Danish/
Norwegian
Finnish/
Swedish Italian
Portuguese
Spanish
United
Kingdom
Keyboard
Code
01234567P
Jl. (Shift)
Jl.
Key
Graphic
$
$
$
$
$
$
U (Shift)
U
$
$
.8. (Shift)
.8.
Key
Graphic
#
#
#
#
#
#
A (Shift)
A
#
#
k(Shift)
Pe-
A
#
Key
Graphic
@
@
@
o(Shift)
@
@
@
(lS (Shift)
j2j
@
@
0
o (Shift)
@
'0
@
Key
Graphic
!
!
1
1
1
.l!
u
!
!
$.
.8.
.8.
!
!
Key
Graphic
..
..
..
..
..
..
A
A
.
..
k
M-
A
is..
..
..
Key
Graphic
4
4
[
[
[
[
0
0
¢
¢
(lS
0
¢
¢
0
t
Key
Graphic
I
I
I
!
!
I
I
I
I
I
I
I
I
I
""-
--,
Key
Graphic
----,
----,
Key
Graphic
Diagram 6-15.
6-22
I
--,
---,
1
I
--,
----,
----,
.8.
--,
----,
$
g (Shift)
$
9
A(Shift) #
---,
---,
X6A
(None)
ASCII and WTC Language Keyboard Codes (Typewriter Keyboard)
...--,-,
---,
a (Shift)
75
A(Shift)
Pts
Pt
.f.
0101 10110
.f.
N (Shift)
#
#
01 11 1011 1
N
011111000
@
@
It.
@
@
g
9
!
!
!
!
a
a
N
N
..
01 1 1 1 1 1 1 0
A
¢
¢
$
$
010010100
A
I
I
I
010011110
I
I
I
----,
----,
----,
----,
0101 10101
..
---,
---,
0101 1 1 1 1 1
011010101
Location and Name
Type
Logic Page
Reference
Function or
Major Units
*A2
Keyboard Controls - 2
9072
KM111-161
Tests for modified
characters and
protected data.
Contains keyboard
operation latches,
control latches,
and MDT latch.
*B2
Keyboard Controls - 1
9069
KM011-071
Contains KB decoder, KB Bits 1-7, and P;
Tab controls, Cursor Alpha Shift; Numeric
Controls, and
Shift; KB Strobe.
Insert!Delete
Controls.
KB Op Decoder outputs;
Char Edit; Csr Edit;
Op Complete; Insert Bit
9; Csr Move; Keybd Bits
1-7.
C2
I/O Gating and Parity
9066
MG011-061
Contains message
buffer register and
parity check
circuits, late
register, attribute
register, and
gating circuitry
for line buffer and
message buffer.
CR Bits 0-9; SR
Bits 3-11; KB Bits
1-7; Fets Out Bits
0-9; Load I/O Data;
Load Message Buffer.
FQ Ser in Bits 0-9; Mesg
Bfr Bits 1-9; Attb Reg
Bits 2-6; P Chk Bfr.
02 (Model 1)
480 Storage and Gate
9057
MB011-061
Model 1 - Contains
480-character
message buffer
and gates.
FQ Ser in Bits 0-9;
Serial Shift Gt;
Shift Fets.
Fets Out Bits 0-9.
02 (Model 2)
960 Storage and Gate
9065
MB011-061
Model 2 - Contains
960-character message
buffer a nd gates.
E2
SERDES and Special
Circuits
L514
KA111-121
Contains line driver
and line receiver,
I/O serializer!
deserializer
(SERDES) and gates,
oscillator, and
5V relay switch.
Data to Control Unit;
Data to Driver
Receiver; Mesg Bfr
Bits 1-9; Keyb bits
3-7; Data.
Data to Control Unit;
Data from Driver Receiver;
SR Bits 1-12; Osc.
F2
960 Storage a nd Gate
9065
MB111-161
Model 1 - Not used.
Model 2 - Contains
960 character
message buffer and
gates.
Third Quarter Serial
in Bits 0-9 (from
card 02); Shift Fets.
FetsOut Bits 0-9.
G2
I/O Control
9068
KA011-081
Contains operation
decoder, I/O gating
controls, status
register, SERDES
controls, and cursor
positioning controls.
Osc, End Screen;
Fets Out Bit 7-8;
SR Bits 1-12; Data
from Driver Receiver;
Attention inputs.
Stop Clock; Index; Sound
Alarm; Write Latch;
System Ready Latch;
Control Word 1 and 2;
Clock; Data; I nput Data;
Device Busy; Read Sync;
Xmit Check; Read Out
Shift; Data to Driver
Receiver; CU Busy;
Input Inhibited; Load
I/O Data; Protected Bfr.
Input
Significant I/O Signals
Output
Keybd Strobe; Keybd
Reset; CU Busy;
I ndex; I/O Unlock
Keybd; Allow Char
Load.
KB lock; FF Enable; Ld
KB to Fets; Char Rdy
Decode; MDT Load Bit 7.
TQ Ser in Bits 0-9.
*Optional feature cards
Diagram 6-16. Logic Card Data (Sheet 1 of 2)
Reference Data
6-23
Location and Name
Type
Logic Page
Reference
Function or
Major Units
H2
Clock and Step Control
9071
KF011-071
Contains dot counter, Osc; Read Out Shift;
character cou nter,
Set I/O Fast Shift;
buffer shifting
Load Late Reg; Last
controls, and buffer
Line.
attribute register.
Interface Op Step Retrace
Ctr; Dot 1-8; Char 0;
Next to Last Char; Last
Char; Char Ctr All
Ones; Fast Shift Latch;
Unformatted Display;
Normal Gates; High
Intensity, Non Disp
Blank; Unprotected Char;
Numeric Field.
J2
Display Control
9067
KFlll-181
Step Retrace Ctr;
ContaIns retrace
counter, line
Retrace Blank; Lines
counter, row counter, 0-9; Csr Line; Input
analog controls,
Inhibited; System
and controls to
Ready; I nsert Mode.
display indicators.
Set Blank for Retrace;
First 9 Lines; Ld LB
Gates; Shift Line
Buff; Ld Atb Reg from
Fets; Step Row Ctr;
Horiz Sync; Blank
CRT at Video Output;
Row 0; Row 1; Last
Row; End Screen;
Unblank; Shift Fets;
Vertical Retrace;
Bump Display; Serial
Shift GT.
K2
Line Buffer and
Character Generator
9058
(M1)
9070
(M2)
MC011-091
Contains gates to
line buffer, ROS
register, line
buffer, ROS
character generator,
and data serializer
for analog.
Fets Out Bits 2-9;
Shift Line Buff;
Blank CRT at Video
Output; Unblank
Ind; Lines 0-8.
Pre ROS Bits 2, 3, and
7; Bits 4, 5,6, and 8
from Line Buffer; Non
Display or Hi Inten;
Video Data Out.
*M2
LP Control
9088
KT011-061
Contains selector
light-pen interface
and control
circuitry.
I/O Busy; Bits 4, 5,
6, and 8 from Line
Buffer; Pre ROS
bits 2, 3, and 7.
Bit 7 and LB and MB;
LP Busy; LP Aid Bits
3, 4, 5, and 6.
*N2
Card Reader
2229
KR011-071
Contains magnetic
card reader interface
and control
circuitry.
CR Data; Keybd
Bits 0-7; Keybd
Parity Bit.
Strobe; Bits 0-7;
Pty; Gate Keyboard.
Input
Significant I/O Signals
Output
L2
(Not Used)
*Optional feature cards
Diagram 6-16. Logic Card Data (Sheet 2 of 2)
6-24
Card
Pin
ALD
Signal Name
Card
Pin
ALD
Signal Name
A-A2
B04
G04
*M10
P05
S03
*S09
S12
U04
U06
KM141
KM111
KM141
KM131
KM141
KM141
KM141
KM141
KM121
+ DE Up Shift
- Ld KB to Fets
- Keybd Strobe
- Load Late Reg Gt
- Keybd Lock
- Keybd Reset
+ KBTune
+ FF Enable
- I nsert Mode
A-H2
A-B2
G03
G09
J10
M03
*M10
*M11
P06
*S02
*S05
*508
*S09
*S13
*U05
*U09
U13
KM041
KM021
KM041
KM031
KM031
KM031
KM031
KM031
KM031
KM031
KM031
KM021
KM031
KM031
KM011
- Fill Hole
- KB Attn Lock KB
- Clr Norm Gt Lth
+ Erase Fld 6
+ Keybd Bit 5
+ Keybd Bit 7
- Set EAU Lth 7
+ Keybd Bit 3
+ Keybd Bit 0
+ Keybd Bit 1
+ Keybd Bit 2
+ Keybd Parity Bit
+ Keybd Bit 4
+ Keybd Bit 6
- Insert Csr Bit 9
B03
006
013
G03
G11
G13
J02
J09
M09
M13
P06
P10
U06
KF071
KF071
KF021
KF071
KF041
KF061
KF051
KF051
KF051
KF031
KF031
KF021
KF021
+ Null Bet Cur and End
+ Numeric Field
- Dot6
+ Unprotected Char
- Shift Fets
+ High Intensity
+ Unformatted 0 isp Lth
+ Normal Gates
+ Fast Shift Latch
- Char All Ones
- Next To Last Char
+ Blank For First Frame
- Late Reg Strobe
A-J2
B04
B10
G08
M08
P04
S02
S05
KF131
KF131
KF161
KF151
KF181
KF151
KF141
+
+
+
+
P04
*S02
S03
MG051
MG051
MG041
+POR
- POR
+ P Chk Bfr
S09
S12
S13
U02
U10
KF141
KF171
KF171
KF141
KF141
+
+
+
A-K2
P11
S09
MC081
MC091
+ Non Dis Or Hi Inten
+ Video Data Out
*B02
B09
B12
J13
KA111
KA111
KA121
KA121
+ Relay Coil
+ Switched 5V
+ 2.385 MHz Osc
+ 4.770 MHz Osc
A-M2
*004
P09
*U06
KT041
KT051
KT051
- LP Strike
- Draw Bars
- LP Sw Closed
A-F2
M02
MB141
+ Fets Out Bit 9
A-G2
B09
*B10
*D07
G04
G07
G09
J05
J13
M06
P02
S04
S06
S09
S10
KA081
KA071
KA061
KA081
KA071
KA061
KA081
KA071
KA061
KA021
KA031
KA031
KA071
KA061
+ Insert Null
- Clr Insert Csr Latch
- Security Key
+ Delete Csr Bit 9
- Protected Bfr
- Device Busy Status Dot
- I nsert Cursor Norm
- Set I/O Fast Shift
+ CU Busy
+ Index
- Delete MDT Bit 7
- Syst Rdy Lth Set
- Op in Process
- I nput Inhibit
A-C2
A-E2
Cond Fets Bit 8
Ld LB Gates
U nblank I nd
End Screen
Up Line
Last Row
Blank CRT at Video
Output
Force Unblank Line
Bump Display
Vertical Retrace
Dev Check
Horiz Sync
*Input pins
Diagram 6-17. Probe Pin Data
Reference Data
6-25
Feature Name
Feature Number
Jumper
Typewriter and Operator Console
Keyboards
4630,4632,4633,
2955
* A2B06 to A2008
Data Entry Keyboards
4631,2973
Remove wire:
A2B06 to A2008
Keyboard Numeric Lock
(USA English, UK English,
Finnish, and Swedish)
4690
Add wire:
B4B 12 to B4008
Remove wire (if installed):
B5B03 to B5008
Keyboard Numeric Lock
(Austrian, Belgian, Danish,
French, German, Italian,
Norwegian, Portuguese, and
Spanish)
4690
Add wires:
B4B 12 to B4008
B5B03 to B5008
Add wire:
*00 not add this wire if display station is at EC 717946 or higher.
Diagram 6-18_
Keyboard Feature Jumpers
To Connector KB 2
(May not be present
on all keyboards)
o
*Key
Modules
Shift
MOS
~
}
Encoder
......_ _ _J----*-*S-t-rob-e-(-P-in-R....;.):....~
Reset (Pin C)
*Each key module (except RESET and the shift keys)
generates two active inputs to the encoder.
**The strobe signal is active when two and only two
active inputs are present at the encoder.
Diagram 6-19. Type A Keyboard Encoding
6-26
To Connector KB 1
I
Hinge
(Model 2)-1
1/2 Boord
Y2
YI
II
(Spore)
0::-
r--.
;0-
-0
0
~
0
~
(Spore)
I
D
C
A
N
U
""
I
(Spore)
G
~
J
-0
~
I
Y3
co
l()
K
R
i::::
-0
~
H
~
]
-0
~
~
U
""
Vl
Vl
a
I---+--+-~-
1---1--1- -~ I-+---t---+--
- - I--t--
~
~
"
]0"
e
~
u
c
0
a..
d
0
"'U
I - ( l - t--~-r-~ --r--- §-o
~
2
~
~
~
~
~
u
"
o
::;"
U
4
(;
+-- -If--+--+--]- -+-- -I-- -
t-- -~ -
I - f-- I - ~ I--
+--+-- -I--+-- - --
"
!
j
Z2
ZI
Keyboard
(Optional Feature)
- "\ -
Z3
--'I LI___
'--_ _ _(_spo_re_)_ _
A_na_I_09_ _ _
~
-~--"-Se-e-A-LD-Z-Z-lO-l-to-c-o-rr-e-la-te-co-r-d-ty-p-e-t-o-p-ar-t-n-um-b-e-r-.-------------------1---
Hinge
(Model 1)
Unique Cord Chort
Locotion
Model
D2
D2
F2
F2
K2
K2
K2
K2
K2
K2
K2
K2
K2
K2
K2
K2
K2
K2
K2
K2
K2
K2
K2
I
2
I
2
I
I
I
1
I
I
I
1
1
2
2
2
2
2
2
2
2
2
2 (APL)
Language
All
All
All
All
US English EBCDIC
US English ASCII-A
US English ASCII-B
UK English
German
Swedish/Finnish
Norwegian/Danish
Spanish
Portuguese
US English EBCDIC
US English ASCII-A
US English ASCII-B
UK English
German
Swedish/Finnish
Norwegian/Danish
Spanish
Portuguese
US English EBCDIC
Nome
480 Stor and Gate
960 Stor and Gate
Spore - Not Used
960 Star and Gate
Line Buffer and Char Gen
Line Buffer and Char Gen
Line Buffer and Char Gen
Line Buffer and Char Gen
Line Buffer and Char Gen
Line Buffer and Char Gen
Line Buffer and Char Gen
Line Buffer and Char Gen
Li ne Buffer and Char Gen
Line Buffer and Char Gen
Line Buffer and Char Gen
Line Buffer and Char Gen
Line Buffer and Char Gen
Line Buffer and Char Gen
Line Buffer and Char Gen
Line Buffer and Char Gen
Line Buffer and Char Gen
Line Buffer and Char Gen
Line Buffer and Char Gen
Type
9057
9065
9065
9058
9103
9104
9102
9101
W068
W069
W070
W072
9070
9098
9099
9097
9096
W075
W076
W077
W079
AG28
(Languages not listed use USA EBCDIC cord types.)
Diagram 6-20.
Board Layout by Card Fw,~:tion - Without Features (Card Side View)
Reference Data
6-27
Hinge
Y2
Y1
(Spare)
A
t
I
C
~
0
-0
~
~
II
I
I
co
g
0
~
II
R
g
M
0
~
N
~
0
I
-0
li
~
V
Ql
~
Light Pen
K
H
i::::
-0
Y4
(Spare)
G
to
-0
~
V
Y3
(Spare)
:;-
t:
a
0
0
~
D
~
0::-
-0
I
I
(ModeI2)~
2/3 Board
Ql
Ql
1
Vl
:!
.~
U
Ql
._-- - - f--'u"0
-
'-r--
8..
--r--
.- .- .- -
-0
.-
I--
a
-~-0
~
I
N
I
~
C
I
~
~
1--3--1--3-1:
-0
g
1.,>-
.E
c
r--.j - --v.,
Ql
Vl
<3
i-
~
ta
-0
4
i
-gO
_ON
E~
Vl 0
T
I
0:;';:
-0
~
~
-3-
c
~
Ql
0">:
l?'C
Ql
l?
]
0
V
~
o _
__ v
~
0
-"U
0
::'3
-0
I--~
-c-
u
a
~
Ql
.r.
V
S
§
-0
0
c
g-
f---c/i--
'"
~
~
a
V
~
~
.,c
0
_v_
-
c
I
.,
&.
!
.r.
0>
::J
-'
.,
- -
I--
-
::'3
~-
-- -- r-- f--~
-
- - -
'-
I
f--
-
::'3
I--
Z1
Z2
Z3
~.,
I
~
6
T
i
Z4
---'I L.1___(_sp_a_re_)_ _---'I L.1___A_n_al_og_ _ _. J1 L.1___*K_e_y_ba_a_rd_ _
'--_ _*_Ke_y_b_oa_rd_ _
....J
- , --~----:t~S-e-e-A-L-D-Z-Z-10-1-t-o-c-o-rr-el-a-te-c-a-rd-ty-p-e-to-pa-r-t- n u - m - b - e - r . - - - - - - - - - - - - - - - - - - - - - - - - - - - - - t Hinge
(Model 1)
*Z1 - Keyboard socket without operator identification card reader feature.
Z4 - Keyboard socket with operator identification card reader feature.
I
Unique C~rd Chart
Location
D2
D2
F2
F2
K2
K2
K2
K2
K2
K2
K2
K2
K2
K2
K2
K2
K2
K2
K2
K2
K2
K2
K2
Model
1
2
1
2
1
1
1
1
1
1
1
1
1
2
2
2
2
2
2
2
2
2
2(APL)
Language
All
All
All
All
US English EBCDIC
US English ASCII-A
US Engl ish ASCII-B
UK English
German
Swedish/Finnish
Norwegian/Danish
Spanish
Portuguese
US English EBCDIC
US English ASCII-A
US English ASCII-B
UK English
German
Swedish/Finnish
Norwegian/Danish
Spanish
Portuguese
US English EBCDIC
Name
480 Stor and Gate
960 Stor and Gate
Spare - Not Used
960 Stor and Gate
Line Buffer and Char Gen
Line Buffer and Char Gen
Line Buffer and Char Gen
Line Buffer and Char Gen
Line Buffer and Char Gen
Line Buffer and Char Gen
Line Buffer and Char Gen
Line Buffer and Char Gen
Line Bdfer and Char Gen
Line Buffer and Char Gen
Line Buffer and Char Gen
Line Buffer and Char Gen
Line Buffer and Char Gen
Line Buffer and Char Gen
Line Buffer and Char Gen
Line Buffer and Char Gen
Line Buffer and Char Gen
Line Buffer and Char Gen
Line Buffer and Char Gen
Type
9057
9065
9065
9058
9103
9104
9102
9101
W068
W069
W070
W072
9070
9098
9099
9097
9096
W075
W076
WOll
W079
AG28
(languages not listed use USA EBCDIC card types.)
Diagram 6-21. Board Layout by Card Function - With Features (Card Side View)
6-28
-
G2J04
N
K
L
M
E2B03
G2D04 -
F
G
E2G03
A ...1----- c.d Column
E
8 A
o
10
1
II
12
13
14
•
•
o
0
•
•
•
•
•
0
0
•
•
•
•
Y4
•
•
•
•
0
•
•
•
0
0
o
o
0
o
0
0
0
0
•••••••••
0
0
0
0
0
Y2
0
0
i
o •
2
•
0
•
0
o •
•
oeO
o •
0
•
0
o •
0
•
0
o •
o • 0
oeo
o • 0
o •
0
0
0
•
o •
o
0
•
0
o
o •
0
•
0
•
o •
0
•
0
o •
0
2
•
o
0
0
o
•
0
000000.0
o •
o •
0
o •
o •
0
•
o •
ooeo.ooeoeo
.ooeoeooe o •
o.oeo
oe
o •
0
0
0
o
•
0
o •
0
•
0
•
0
•
0
•
0
o •
0
•
0
•
0
•
0
o •
o •
0
•
oeooeoeo
o •
0
•
o •
0
0
o •
0
o •
0
•
0
o •
oeo.ooeo
0
•
o •
o •
o •
0
eo
o.oeo
.ooeo.ooeoeo
o • 0 • 0
o • 0
0
o •
ooeoeo
o •
ooeoeo
·.
Probe Pins
J G
o •
0
0
•
oeo.ooeoeo
o • 0
13
14
j"
2
o
0
0
•
o •
o •
0
•
0
•
0
oeoeo
•
0
0
o
4
0
•
oeo.oo.oeooeo.ooeoeo
oeo.ooeoeoo.
o • 0 • 0
oeooeoeo
oeoeoo.
•
0 0 •
o.
oeoeo
o.oeo
ooeo.
eo.ooeoeo
9 •
o
13
14
o
0
•
•
0
0
•
o
0
•
0
•
0
2
0
•
0
•
0
0
•
2
0
o •
0
0
0
0
oo.oeo
ooeoeo
•
o •
0
•
0
o •
0
0
o •
o
•
•
0
4
::~:':::.
o
0
o
•
0
•
0
o. ;:).
o
0
0
0
o •
•
P M
0
o •
0
o •
0
•
•
0
•
o •
0
0
0
0
0
o
0
0
•
0
0
•
0
0
•
0
o •
o •
0
0
14
o
oo.oe.o
o • 0 • 0
•
oe
o •
0
0
•
ooeoeo
o.oeo
•
o •
0
••••••••••
•••••••••
0
0
0
0
•
0
0
0
•
0, •
•
0
••••••••
000..........
Z2
o
0
0
0
0
0
0-0
0
0
0
0
0
0
0
o ••••••••••••
0
0
o •
0
+5V
Bus (Wl)
U S
0
13
0
000 .......•..•.
0
ZI
0
0
0
0
0
0
0
0
G2P09
G2S13
0
•••••••••••
C6E04
Model 2 only
·.
Probe Pins
oeoeoo
00000000
Return
5
:j: •
0
5
Bus (W2)
2
oeoeoo.
0
0
0
0
0
0
oeo
•
o
Z4
o •
o •
0
o •
oeoeo
4
-I
0
oeoeoo.
o •
0
oe
•
o •
o •
o •
o •
0
0
oeo
ooeoeo
o • 0 • 0
oo.oeo
•
0
0.00.0.00.0.00.0.00.0.0
•
o •
0
j"
2
3
o •
0
0
o •
o •
o •
o •
•
13
14
•
13
o
0
o •
0
·.
Probe Pins
oo.oeo
oeoeoo.
ooeoeo
o •
0
•
oe
o •
o •
o •
oeooeo.
o
0
o •
o
•
00.000
r
0
o •
oeoeooeo.
:1': :
-I
oooooeo
0
o •
oeo.ooeoeo
6
3
0
14
5
13
14
-I
oeq.oo.
o •
13
B
2
o •
o •
o •
•
0
oeo.ooeoeo
3
o
oeoeoo.
•
o •
j"
2
..
Probe Pins
o •
0
o •
A1D13
oeo
oeo
ooeoeo
oeo.ooeo.
o •
o •
o •
oeC?oeo
2
13
14
1..... Card Row
13
J4
000000
o
Pin Column
10
II
12
•••••••••
Return
+5V
Bus (W2)
Bus (Wl)
0
14
-I
2
3
4
6
5
Model 1 only
Pin Location Code
Gate
Board
Notes:
1.
2.
3.
4.
5.
6.
7.
B.
+5V is found on all D03, J03, P03, and U03 pins.
DC return (ground) is found on all DOB, JOB, POB and UOB pins.
+BV is found on pin E2D 11.
-12V is found on pins D2D06, F2D06, E4D06, M2D06, and K2D06.
+34V is found on pin M2D11.
Two high card in E2 and four high card in G2 used for illustration.
2/3 board (feature board) used for illustration.
1/2 board (no features) is the same except:
a. Card columns L, M, and N are not present.
b. Sockets Y4 and Z4 are not present.
c. +5V bus runs between card columns Hand J.
d. Ground bus runs between card columns J and K.
Diagram 6-22.
Card Column \
Socket
Location
Card Row
Pin Column
I
Pin Row
A A1
M 2
I
~:n::::,vb~~lIed
~
B 09
Board Layout Pin Identification Data (Pin Side View)
Reference Data
6-29
Section 7. Component Locations
Photographs and drawings are provided in this section to
aid in locating field-replaceable units, adjustable components, and voltage measurement points.
Diagrams 7-1 through 7-6 show Model 1 and Model 2
component locations. Type A keyboard locations are
shown in Diagrams 7-7 and 7-8. Voltage component
locations and test points are shown in Diagrams 7-9 through
7-15. Diagram 7-16 shows component locations on both the
old and new analog cards. Type B keyboard locations are
shown in Diagrams 7-17 through 7-20.
Diagram 7-1. Model 1 Locations, Front View
Component Locations
7·1
Cone
Shield
Centering
Magnets (2)
(Under Shields)
Yoke Shield
(*Yoke under
Shield)
*CRT
CRT
Anode
*prime
Power
Box
2V Regulqtor
(Behind LowVoltage PC Board
"';;';;'-";;;::::::ii!!I.,. Analog Card
Adjustments (4)
Ferro
Focus
Potentiometer
Diagram 7-2. Model 1 Locations, Left-Side View
7-2
*High-Voltage
Power Supply
INTEN
CRT Pb
*Field Replaseaqle Units
Diagram 7-3. Model 1 Locations, Rear View
Component Locations
7-3
*OFF-PUSH
Switch (Power)
(Brightness - Outer Knob)
(Contrast - Inner Knob)
Cable - ................:.
Clamp
Diagram 7-4. Model 2 Locations, Front View
74
Diagram 7-5. Model 2 Locations, Right-5ide View
Component Locations
7-5
Diagram 7-6. Model 2 Locations, Left-Side View
7-6
vco~'
Original Design
~
Audible
Feedback
Assembly
/
/
Keyboard
Assembly
I
I
~
NO~~;her a jumper wire or a
Cable
Assembly
Isolotor
ground strap wi II be found
connecti ng bottom pan to
keyboard assembl y.
Audible Feedback
Assembly
Later Design
Connector
KB 1
Bottom Pan
Cable Assembly
Bracket
Diagram
.
7 -7 . Type A Keyboard Locations
Component Locations
7-7
Audible Feedback
Card Pin
Audible Feedback
Assembly Card
0000000
From/To
*
*
*
*
1
2
3
4
5
6
7
8
9
Function
I/O Conn 10
I/O Conn 25
I/O Conn 12
I/O Conn 13 and
KBI Z
Not Used
Not Used
Not Used
Audible Feedback Assy (White wire)
Audible Feedback Assy (Blue wire)
* At Display Station
23456789
Blowup of KBI
Key
Lw
J 000000000000000 0O~ 00 DL
ABC D E F H J K L M N P R STU
Xy z
Keyboard Signals
I/O Conn
at Display
Station
1
2
3
4
5
6
7
8
9
10
11
12
13
KBI Conn
at
Keyboard
D
E
F
H
J
L
M
N
R
X and Y
Z
Signal
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bit 6
Bit 7
Parity Bit
Strobe
Audible Feedback Signal
Gnd (OV dc)
Audible Feedback Return
-12V dc
I/O Conn
at Display
Station
14
15
16
17
18
19
20
21
22
23
24
25
KBI Conn
at
Keyboard
T
U
S
P
K
A
Not Used
Not Used
C
B
V and W
-
Signal
Alpha
DE Up Shift
Numeric
Flip-Flop Enable
Bit 5
Spare
Not Used
Not Used
Reset
Spare
+8V dc
Audible Feedback +8V dc
Common Logic Area
I
I
Address Bus
L_-,
L_
Top View
Diagram 7-8. Type A Keyboard Pin Assembly and Terminal Location
7-8
Input Signal
+8V
Return
-12V
Return
-12V
+5V
+5V Return
Prior to
EC 717661
J2
0=-=-=-=-=-=-=-===00
-12V (3 pins)
-12V Return
(8 pins)
+34V Return
+34V
-18V Return
EC 717661
and Later
+34V Return
Diagram 7-9. Low.voltage Printed Circuit Board
Component Locations
7-9
It
O+5V
(
~
)
Fl
2ASB
OC2
F2
SASB
~
a
~ I
o
~
a
+34V
~
CS
-12V
'"
O+8V
a
OC3
""a-
Diagram 7-10. Low-Voltage Printed Circuit Board Shield
Arc·Suppression Neon
Diagram 7-11. Model 2 Voltage Distribution Board
7-10
a
REG
F3
2ASB
18V
zw
0
0I-
c..
>-
Q..
~
J3-5
J3-6
OF F-PUSH Control Shaft
Notes:
1. "J" denotes jack "P" denotes plug.
2. See 3277 ALDs, page 22011, for
detailed diagram.
Une Fuse (F1)
Diagram 7-12. Model 1 Prime Power Box
C
B
A
Rl (Contrast)
R2 (Brightness)
Diagram 7-13. Brightness and Contrast Control Terminals
Component Locations
7;. 11
. - - - - - 0 - +400V (Focus)
To CRT Anode
/~(\~
~
~
....-_ _ +400V
Enable Input (uv)
...---- DC Return
Focus Adj
Potent io meter
Diagram 7-14. High...Voltage Power Supply
Arc-Suppression Neon
o
o
o
Diagram 7-15. Model 1 Arc-Suppression Board
o
o
o
Notes:
1. Connector pins on reverse side of board.
2. Component layout may differ from
illustration, depending on part number
and EC level; however, connector pins
are numbered the same on all variations.
Old Style PN 2565236
TOP
MARGIN
I
Danger
This pin has 600V on it.
No attempt should be made to
measure this voltage.
WIDTH
SWEEP INDIC
Neon
GND
Pl (A)
Horiz Drive to Yoke (Flyback) - - - 6
Horiz Regulator to Horiz Yoke - - 5
Yoke Up Winding
4
P4 (D)
t;
+8V to Yoke
1
2
3
Yoke Down Winding - - - - - -
4
5
6
7
8
9
P2 (B)
Not Used
10
11
12
13
14
15
16
17
18
19
20
21
P3 (C)
+34V to HV Supply - - - - - HV Enable Line
Horiz and Int. DC Gnd In
+34V In
-12Vln
+8Vln
Vert DC Gnd In
+12V Test Point
POR Input (Analog) - - - - - -
9
8
7
6
5
4
3
2
Note: When PN 2565236 is replaced by
PN 2565080 or PN 2568924, a jumper,
PN2577848 (3277 Modell) o.r
PN 2568928 (3277 Model 2) must be added
from P4 pin 7to frame ground.
* = Feature
Diagram 7-16. Analog Card (Sheet 1 of 2)
+8V to Brightness Potentiometer
Wiper· Brightness Potentiometer
+66\/. Brightness Pot
CRT Grid
DC Gnd to Audible Alarm'
CRT Cathode
Frame Gnd
·-Vert Skip (Bump) In
Spare
+Vert Retrace
+5V In (Fast 5)
+Unblank CRT
DC Gnd from Logic Board
+Horiz Sync
Dual Intensity (+Bright, -Normal)
-Audible Alarm from Logic'
Wiper of Contrast Potentiometer
Contrast Potentiometer
-Audible Alarm to Alarm'
+5V to Audible Alarm'
POR to Logic
New Style PN2565080 and PN2568924
TOP
MARGIN
~~~~~n has 600V on it.
I
SWEEP INDIC
No attempt should be made to
. measure this voltage.
P4(D)
P1 (A)
""
Horiz Drive to Yoke (Flyback) - - - 6
Horiz Regulator to Horiz Yoke - - - 5
Yoke Up Winding
4
+8V to Yoke
WIDTH
Test
Points
I~
Yoke Down Winding - - - - - P3(C)
+34V to HV Supply - - - - - HV Enable Line
Horiz and Int. DC Gnd In
+34V In
-12V In
+8V In
Vert DC Gnd In
+12V Test Point
POR Input (Analog)
9
8
7
6.
5
4
3
2
1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
+8V to Brightness Potentiometer
Wiper· Brightness Potentiometer
+60V Brightness Potentiometer
CRT Grid
DC Gnd to Audible Alarm·
CRT Cathode
Frame Gnd
-Vert Skip (Bump) In
Spare
+Vert Retrace
+5V In (Fast 5)
+Unblank CRT
DC Gnd from Logic Board
+Horiz Sync
Dual Intensity (+Bright, -Normal)
-Audible Alarm from Logic·
Wiper of Contrast Potentiometer
Contrast Potentiometer
-Audible Alarm to Alarm·
+5V to Audible Alarm·
POR to Logic
* = Feature
Diagram 7-16. Analog Card (Sheet 2 of 2)
y.,,~1B10'k
Alternate Mode indicator
used with Text Feature only
See Diagram 7-21 for
pin connections
Top Cover
Circuit Board and
Electronics Assembly
Audible Feedback
Card Assembly
Captive Screw
Bottom Pan
Cable Assembly
Bracket
Diagram 1·11. Type B Keyboard Locations
Reference Data
1-15
Keybutton Group*
Protective Shield/
Membrane * f
Upstop*
Spacebar Stabi Iizer*
End Plate (2)*
'~~
Pivot (2)*
Pad*
Foam Strip (2)t
Top Insulator (2)
Circuit Board and
Electronics Assembly
Bose Insulator
Base Plate
*Components form all-keys assembl y.
fMay or may not be present, depending upon EC.
Ground Isolation Insert (6)t
Holding Screw (~)
Diagram 7-18. Type B Keyboard Assembly
7-16
Audible Feedback
Card Pin
2
KBI
Test Points
D
2
3
13
6
4
7
*
*
*
Function
I/o Conn 10
I/o Conn 25
I/o Conn 12
I/O Conn 13 and
Input Signal
+8V
Return
-12V
KBI D02
Not Used
Not Used
Not Used
Audible Feedback Assy (White wire)
Audible Feedback Assy (Blue wire)
Return
-12V
* At Display Station.
9
Keyboard Signals
I/O Conn
at Display
Station
• •
• •
• •
• •
•• ••
• •
• •
• •
• •
• •
• •
*
1
2
3
4
5
6
7
8
9
Audible Feedback
Assembly Card
0000000
From;ro
1
2
3
4
5
6
7
8
9
10
11
12
13
KBI Conn
at
Keyboard
I/O Conn
at Display
Station
Signal
B05
B06
D13
B08
B09
B13
B12
B04
B02
DIO
D08
14
15
16
17
18
19
20
21
22
23
24
25
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bit 6
Bit 7
Parity Bit
Strobe
Audible Feedback Signal
Gnd (OV dc)
Audible Feedback Return
-12V dc
-
D02
KBI Conn
at
Keyboard
Signal
D05
D04
006
Dll
BIO
007
Not Used
Not Used
D12
B11
D03
* Alpha Shift
** DE Up Shift
* Numeric Shift
KB Lockout
Bit 5
Spare
Not Used
Not Used
Reset
Spare
+8V dc
Audible Feedback +8V dc
-
*Ground on Typewriter Keyboard
**Not used on Typewriter Keyboard
Circuit Board
and Electronics
Assembly
System
Connect
Socket
(KB1)
TEST POI NTS
B 0
2·
E3
o
E3
Voltage Regulator
8V dc to 5V dc
o ~I
= II
~~==~--~ ~------~
c:::J
r r - - v -...... - - - - - - - - - - - - - - - - - -
I
I
I
I
I
I
L __ -,
,
All-Keys Assembly
__ -.J
_ _ ..J
L_
Key Modules
Top View
Diagram 7-19. Type B Keyboard Assembly Pin and Terminal Locations
Component Locations
7-17
Audible Feedback
Card Pin
1
2
3
4
5
6
7
8
9
Audible Feedback
Assembly Card
0000000
6
4
KB1
Test Points
.1,3
*
*
*
*
I/O
I/O
I/O
I/O
Conn 10
Conn 25
Conn 12
Conn 13 and KB1 D02
Not Used
Not Used
Not Used
Audible Feedback Assy (White wire)
Audible Feedback Assy (Blue wire)
Return
-12V
* At Display Station.
9
I/O Conn
at Display
Station
•
•
•
•
•
•
•
•
•
•
•
•
KB1 Conn
at
Keyboard
1
2
3
4
5
6
7
8
9
10
11
12
13
B05
B06
D13
B08
B09
B13
B12
B04
B02
D10
D08
-
D02
Signal
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bit 6
Bit 7
Parity Bit
Strobe
Audible Feedback Signal
Gnd (OV dc)
Audible Feedback Return
-12Vdc
I/O Conn
at Display
Station
KB1 Conn
at
Keyboard
14
15
16
17
18
19
20
21
D05
D04
D06
D11
B10
D07
Not Used
Not Used
D12
B11
D03
22
23
24
25
Signal
* Alpha Shift
** DE Up Shift
* Numeric Shift
KB Lockout
Bit 5
Spare
Not Used
Not Used
Reset
Bit 8
+8V dc
Audible Feedback +8V dc
-
*Ground on Typewriter Keyboard
** Not used on Typewriter Keyboard
Circuit Board
and Electronics
Assembly
System
Connect
Socket
(KB 1)
Voltage Regulator
8V dc to 5V dc
I DDD DDDDDDDDDIE3E3E3~.
~~; c=J ~ DDDD~DDD DD~=
2
r
0
~-~--..-----------------
I
I
I
1
_ _ -.1
--~
A11- K'eys Assemb Iy
Key Modules
Top View
Diagram 7-20. Type B Keyboard Assembly Pin and Terminal Locations (Data Analysis - APL Feature)
7-18
Input Signal
+8V
Return
-12V
Keyboard Signals
D
•
•
•
•
•
•
•
•
•
•
•
•
7
Function
From/To
Audible Feedback
Card Pin
1
2
3
4
5
6
7
8
9
Audible Feedback
Assembly Card
0000000
2
KBI
Test Points
6
7
I/O Conn
at Display
StQtion
• •
• •
• •
• •
• •
1
2
3
4
5
6
• •
• •
• •
• •
• •
13
5
*
*
*
*
I/O Conn 10
I/O Conn 25
I/O Conn 12
I/O Conn 13 and
KBI D02
Not Used
Not Used
Not Used
Audible Feedback Assy (White wire)
Audible Feedback Assy (Blue wire)
Input Signal
+8V
Return
-12V
Return
-12V
* At Display Station.
9
Keyboard Signals
D
2
3
4
Function
From/To
B05
B06
013
B08
B09
B13
B12
B04
B02
010
008
7
8
9
• •
• •
KBI Conn
at
Keyboard
10
11
12
13
-002
I/O Conn
at Display
Station
Signal
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bit 6
Bit 7
Parity Bit
Strobe
Audible Feedback Signal
Gnd (OV dc)
Audible Feedback Return
-12V dc
14
15
16
17
18
19
20
21
22
23
24
25
KBI Conn
at
Keyboard
005
004
006
011
BIO
007
Not Used
Not Used
012
B11
003
-
Signal
* Alpha Shift
** DE Up Shift
* Numeric Shift
KB Lockout
Bit 5
Spare
Not Used
Not Used
Reset
Bit 8
tSY dc
Audibl e Feedback +BY dc
*Ground on Typewriter Keyboard
** Not used on Typewriter Keyboard
Circuit Boord
and Electronics
Assembly
System
Connect
Socket
(KB1)
DODDDDDDDIE3~8~o
'-------'~I c=J ~ DOOmmOO DOL
Tt;tst Points
~ rr
Yellow wire to this pin from
Alternate Mode indicator.
DOD
,,--,.,.--,-----------------
All-Keys Assembly
Key Modules
Top View
Diagram 7-21. Type B Keyboard Assembly Pin and Terminal Locations (Text Feature)
Component Locations
7-19
Section 8. Installation Instructions
8.1 GENERAL
8.2.1 Line Voltage Check
Carefully inspect the display station for any obvious
damage as soon as it arrives on site. Check that all items
listed in the bills of material are received. It is extremely
important that po~er~source line voltage is correct and that
primary power connections in the' display station are
correct before power is applied to the unit. Do not turn
power on until the following checks are performed.
Domestic (USA) models use 115V ac (±10%), 60-Hz,
single-phase line voltage. No internal adjustments are
required for domestic display stations~
8.2 INSTALLATION
Check with the customer, and place display station in the
location designated by him. If it is necessary to move a
display station, observe good safety procedures.
ImpOrtant Note,' A grounded power source must be used.
World Trade models use 100, 110, 123.5, 220, 235V ac,
lQOV ac, 60-Hz single-phas~ line
voltage. Check that the:cormections on the ferro terminal
block, TB 1, agree with the line voltage provided. Diagram
8-1 showsthe 50-Hz/TB1.,.
50~Hz,single-phase,Qr
8.2.2 Feature Installation
Connect all features supplied with the display station.
Proceed to paragraph 8.2.3 if no features are to be
attached.
DANGER
8.2.2.1 Keyboard Installation
The 3277 Model 2 Display Station weighs about 40 kg
(90 pounds). Two men should be used to move this
unit. Separate the upper chassis from the lower chassis
before trying to move the Model 2 display station alone.
(See paragraph 5.3.2.8, steps 1-7, to separate the two
chassis.)
1. Remove front cover.
2. Plug keyboard cable connector into keyboard jack.
Diagrams 7-1 and 7-4 show location of cable jacks for
Model 1 and Model 2 display stations, respectively.
3. Secure cable by attaching Modell nylon cable clamp or
by hooking Model 2 I/O cable retainer. (Model 2 cable
COM lOOV IlOV 123.5V
220V 235V
000
Ferro
Diagram 8~1.
50~Hz
Ferro TB·1
Installation Instructions
8~ 1
retainer may have to be repositioned to maintain a snug
connector fit.)
4. Connect cable ground strap to the chassis.
3. Open side covers.
4, Inspect for loose cords in logic gate and for loose cable
connections.
8.2.2.2 Selector Light-Pen Installation
8.2.4 Power-On Checks
1. Place pen holder next to display station.
2. Insert pen in pen holder.
1. Plug line cord into power source, and pull out OFFPUSH switch.
2. Perform the display station operational test described in
paragraph 5.1.2, beginning at step 3.
3. Refer to Section 3 (Symptom Index) if a malfunction
occurs during power-on check procedure.
4. Refer to paragraph 5.2 if any adjustments are required
during power-on check.
5. Connect control unit signal cable.
6. Replace all covers previously removed except front
cover.
8.2.2.3 Operator Identification Card Reader Installation
1. Remove front cover.
2. Plug reader cable connector into reader jack. (Diagrams
7-1 and 7-4 show cable socket locations for Model 1 and
Model 2 display stations, respectively.)
3. Secure cable by attaching nylon cable clamp (Model 1)
or by hooking the cable retainer (Model 2).
4. Connect cable ground strap to chassis.
5. Attach correct WTC language feature label over English
language label if applicable.
8.2 ..5 Hexadecimal Address Label
1. On front cover, locate a point 76.2 mm (3 inches) up
8.2.3 Prepower-On Checks
1. Remove front cover if it was not previously removed to
install feature(s).
2. Plug line cord into display station chassis jack.
8-2
from bottom edge and 12.7 mm (1/2 inch) in from left
edge.
2. Attach label to cover, parallel to bottom edge, with
lower-left corner of label on the point located in step 1.
3. Replace front cover.
'Appendix A. Offline Selector Light-Pen Test
This appendix contains offline procedures for formatting
the buffer and for testing the selector light-pen feature.
The procedures are used for 3277 Display Stations attached
to 3274 Control Units.
1. Take the display station offline by removing the signal
cable at the display station.
2. Press the CLEAR key, then the RESET key.
3. Move the cursor four positions to the right using the
cursor move keys (do not use the space bar).
4. Type in >SEL PEN/UNPROT.
5. Move cursor four additional positions to the right
using the cursor move keys (do not use the space
bar).
6. Type in ?SEL PEN/PROT.
7. Move cursor to the next row using the cursor move
keys.
8. Move cursor four positions to the right using the cursor
move keys (do not use the space bar).
9. Press space bar and type SEL PEN/UNPROT.
10. Move cursor six positions to the right using the cursor
move keys.
11. Type in NUM/UNPROT.
12. On board 01A A 1, install jumpers from C2S03 to
ground and from C2B08 to ground.
13. Cursor should now be located one position after the
NUM/PROT field.
Type in a space (Le., press
the space bar).
14. Using the cursor move keys only, move the cursor
backward to the first position to the left of the
NUM/UNPROT field.
15. Type in the character & (will not be displayed).
16. Using the cursor move keys only, move the cursor
backward to two positions to the left of the third
SEL PEN field (SEL PEN/UNPROT).
17. Type in the letter D (will not be displayed).
18. Move the cursor backward to the left of the? using
the cursor move keys.
19. Type in the letter Y (will not be displayed).
20. Move cursor to the left of the> using the cursor
move keys.
21. Type in the letter D (will not be displayed).
22. Remove the jumper from C2B08 to ground,
SEL PEN/UNPROT
field
is normal intensity,
selector pen detectable, and unprotected with a 'space'
as the designator character.
NUM/UNPROT field is numeric, unprotected, and
nQnselector pen detectable.
Field from the NUM/UNPROT to the end of screen
is unprotected, alphameric, normal intensity, and nonselector pen detectable.
If the selector light-pen feature is installed, detection of the
change the designator character to a ? and viceversa in either the first or second selector pen fields.
A successful detect on the third selector pen field (SEL
PEN/UNPROT) will cause the Input Inhibited indicator to
turn on. Press the RESET key to turn off the Input Inhibit
condition.
A ttempted keyboard entry into the high intensity field
will cause the Input Inhibited indicator to turn on. Press
the RESET key to turn off the Input Inhibit condition.
Attempted entry of alphabetic characters into the
NUM/UNPROT field with numeric lock feature installed
should cause the I nput I nhibited indicator to turn on.
Press the RESET key to turn off the Input Inhibit
condition.
> should
Notes:
1. If the above tests fail and the buffer attributes are
suspected, they can be displayed by jumpering 01 A
A 1H2D07 to ground.
2. If a problem is discovered while performing this test,
refer to Symptom Index or Troubleshooting Diagrams
to resolve the problem.
3. The dual intensity fields can be used when performing
contrast adjustments.
CAUTION
When you have completed the offline tests, remove all test
jumpers before reconnecting the signal cableto the display
station.
The screen is now formatted as follows:
>SEL PEN/UNPROT field is normal
selector pen detectable, and unprotected.
intensity,
?SEL PEN/PROT field is high intensity, selector
pen detectable, and protected.
Offline $elector Light·Pen TfSt
A·1
Attribute
Attribute
~~----------~ Reg
Reg
~~----------------------------------~
Gate
C2
H2
Brightness
Contrast
[1
:--1::[----
Coaxial
Cable
(Serial Data)
From Hi9h_{
Voltage
Power
Supply
Late
Reg
Gate
Video Data Out
~---------------~10~---------------~
..---------------..(10'>---..
I
I
High Intensity
I
I
I
L __ _
LB
Gates
ROS
Line Buffer
Reg
K2
'F2
Intensity
Control
Circuitry
K2
K2
8
Model 2
Horizontal
Width
I
I
I
I
I
•
Horizontal
Deflection
Amplifier
Parity
Check
C2
Horizontal Sync
Character
Height
Card
Reader
L_~" ~:~es
Controls
N2
Timing
Ctrls
r--~
Osc
E2
Row
Ctr
H2
H2
Vertical Retrace
Vertical
Deflection
Amplifier
J2
Pen
Audible
Alarm
'Bump Display
OFF-PUSH
Power
Timing
+5V
+8V
+34V
-12V
6.3Vac
ICRT Fil.l
HV
(CRn
(Feedthrough)
Analog Card
Notes:
1. 110 and display data shown by heavy line.
2. 'Model 2 only.
3. -
4.
5.
Diagram 6·23. Data Flow
-
0
T
-
~
Keyboard data path when card reader feature is installed.
~
Adjustment.
~
Switch.
Reference Data FO-1
Index
AC Capacitor Removal 5-10
Address Label 8-2
Addresses, Control Units and Display Stations 2-12
Adjustments:
Analog Card 5-7
Brightness 5-7
Contrast 5-7
Display Image 5-6
Focus 5-7
General 5-6
Magnetic Centering Rings 5-7
Power Control Switch 5-8,5-9 (Diag 5-1)
Yoke 5-7
-12V Regulator Card 5-8
Alarm (see Audible Alarm)
AI ignment Mask 2-3
Analog Card:
Adjustments 5-7
Removal 5-13
Analog Component Removal 5-12
APL:
Keyboard 6-4,6-6 (Diag 6-3)
Keyboard Assembly Pin and Terminal Locations 7-1i.
Keyboard Codes 6-11 (Diag 6-8), 6-15 (Diag 6-10),
6-16 (Diag 6-11),6-18 (Diag 6-12)
Arc-Suppression:
Board (Model 1) 7-12 (Diag 7-15)
Check 5~4
Neon 6-3
ASCII:
Character Differences 2-12 (Diag 2-9)
Character Generators 6-3
Keyboard Codes 6-22 (Diag 6-15)
Keyboards 6-4
Audible Alarm 6-2
Audible Alarm Removal 5-20
Audible Feedback Assembly Removal 5-14
Audible Response 6-2
I
,
Box in Every Character Position 3-10 (Diag 3-14)
Brightness Adjustment 5-7
Brightness and Contrast Control:
Removal 5-13
Terminals 7-11 (Diag 7-13)
Card Reader (see Operator Identification Card Reader)
Centering Rings (see Magnetic Centering Rings)
Character Height 3-9 (Diag 3-8)
Character Height Adjustment 5-8
Checks:
Keyboard 5-5
Operational 5-1,5-2
Voltage 5-3,8-1
Circuit Board and Electronics Assembly (Type B) 5-19 (Diag 5-12)
Codes, Keyboard 5-6,6-3,6-9 (Diag 6-7)
Component Locations:
Discussion 7-1
Display Station, Model 1:
Front View 7-1 (Diag 7-11
Left-Side View 7-2 (Diag 7-2)
Rear View 7-3 (Diag 7-3)
Display Station, Model 2:
Front View 7-4 (Diag 7-4)
Left-Side View 7-6 (Diag 7-6)
Right-Side View 7-5 (Diag 7-5)
Keyboard:
Type A 7-7 (Diag 7-7), 7-8 (Diag 7-8)
Type B 7-15 (Diag 7-17), 7-16 (Diag 7-18), 7-17 (Diag 7-19)
Component Replacement (See removal entry for desired
component.)
Contrast Adjustment 5-7
Control Unit Addresses 2-12
Controls:
External 6-1
Internal 6-2
Cover Removal:
Display Station 5-9
Keyboard 5-14
CRT:
Glow 3-9 (Diag 3-9)
Removal 5-12
Cursor in Every Row 3-10 (Diag 3-13)
Data Flow FO-1
Date Code, Keyboard 5-6
Diagnostic Programs 1-1, 2-3
Display I mage Adjustment 5-6
Display Station Addresses 2-12
Display Station Test:
T est Pattern 1 5-1
Without Test Pattern 1 5-2
EBCDIC Keyboard Codes 6-3,6-9 (Diag 6-7)
Encoding, Keyboard (Type A) 5-5,6-26 (Diag 6-19)
External Controls 6-1
External Indicators 6-1 (Diag 6-1), 6-1
Failure Isolation 1-1
Feature Installation 8-1
Ferro Transformer:
Removal 5-10
50-Hz TB-1 8-1 (Diag 8-1)
Field Replaceable Units (FRU) 1-1
Focus Adjustment 5-7
Focus Problem 3-10 (Diag 3-18)
Fuse Removal 5-11
General Logic Probe 2-2 (Diag 2-1 )
Glow on CRT 3-9 (Diag 3-9)
Hexadecimal Address Label 8-2
High-Voltage Check 5-4,5-5
High-Voltage Power Supply 7-12 (Diag 7-14)
High-Voltage Power Supply Removal 5-11
Horizontal Sync Problem 3-10 (Diag 3-15)
Horizontal Width Adjustment 5-7
Index
X-1
Image Out of Focus 3-10 (Diag 3-18)
Image Size (see Analog Card Adjustments)
Indicators:
External 6-2
Internal 6-3
Installation:
Component (See removal entry for desired component.)
Features 8-1
Keyboard 8-1
Operator Identification Card Reader 8-2
Selector Light Pen 8-2
I ntermittent Problems 3-2
I nternal Controls 6-2
I nternal Indicator 6-3
Jumper, Keyboard Feature
6-26 (Diag 6-18)
Key Module and Encoding (Type A) 5-5,6-26 (Diag 6-19)
Keyboard:
Audible Response 6-2
Character Codes:
APL 6-11 (Diag 6-8), 6-15 (Diag 6-10), 6-16
(Diag 6-11),6-18 (Diag 6-12)
ASCII and WTC Languages 6-22 (Diags 6-14, 6-15)
Data Entry Keyboards 6-10
Text Feature 6-5
Typewriter and Operator Console 6-9
Checks 5-5
Component Locations:
Type A 7-7 (Diag 7-7), 7-8 (Diag 7-8)
Type B 7-15 (Diag 7-17), 7-16 (Diag 7-18), 7-17 (Diag 7-19)
Component Removal 5-14
Cover Removal 5-14
Date Code 5-5
Descriptions 5-5
Feature Jumpers 6-26 (Diag 6-18)
Installation 8-1
Output Codes 5-6
Removal from Display Station 5-14
Return 5-5
Strobe Check (Type A) 5-5
Switch Module Removal (Type A) 5-15
Tests 5-1
Voltage Checks 5-5
Keyboards:
APL - US 6-4,6-6 (Diag 6-3)
ASCII 6-4
Data Entry 6-3,6-7 (Diag 6-5)
Operator Console 6-3,6-7 (Diag 6-4)
Text Feature 6-8 (Diag 6-6)
Typewriter 6-3,6-6 (Diag 6-2)
Keybutton Removal 5-15
Keybutton Support Module Removal (Type A) 5-17
Light Pen (see Selector Light-Pen)
Line on CRT 3-9 (Diag 3-10)
Line Voltage Check 8-1
Linearity Adjustment 5-8
Locations (see Component Locations)
Logic Board:
Layout 6-27 (Diag 6-20), 6-28 (Diag 6-21), 6-29
(Diag 6-22)
Removal 5-14
Logic Card:
Data 6-23 (Diag 6-16)
Removal 5-14
X-2
Logic Probe
Low-Voltage
Low-Voltage
Low-Voltage
Low-Voltage
2-1
DC Checks 5-3
Power Supply Removal 5-10
Printed Circuit Board 7-9 (Diag 7-9)
Printed Circuit Board Shield 7-10 (Diag 7-10)
Magnetic Centering Ring Adjustment 3-9 (Diag 3-7), 5-7
Maintenance Approach 1-2 (Diag 1-1)
No Horizontal Sync 3-10 (Diag 3-15)
No Interrow Spacing 3-10 (Diag 3-16)
Offline Selector Light-Pen Test
A-1
Offline Maintenance 1-1
OFF-PUSH Switch Adjustment 5-8,5-9 (Diag 5-1)
OLTs 2-3,2-13
Online Maintenance 1-1
Operator Identification Card Reader:
Installation 8-2
Removal 5-21
Test Card 2-3
Tests 5-2
Oscilloscope 2-1
Out of Focus Image 3-10 (Diag 3-18)
Pin and Terminal Locations:
Type A Keyboard 7-8 (Diag 7-8)
Type B Keyboard 7-17 (Diag 7-19), 7-18 (Diag 7-20)
7-19 (Diag 7-21)
Pin Identification Data 6-29 (Diag 6-22)
Power Component Removal 5-10
Power Control Switch:
Adjustment 5-8,5-9 (Diag 5-1)
Description 6-1
Removal 5-14
Prime Power Box Removal:
Model 1 5-10,7-11 (Diag 7-12)
Model2 5-10
Probe Pin Data 6-25 (Diag 6-17)
Raster:
Model 1 3-9 (Diag 3-11)
Model2 3-9 (Diag 3-12)
Regulator Card Adjustment (see -12V Regulator Card
Adjustment)
Removal:
Analog Components 5-12
Audible Alarm 5-20
Audible Feedback Assembly 5-14
B rightness and Contrast Controls 5-13
Covers 5-9
CRT 5-12
Keyboard from Display Station 5-14
Keyboard Components 5-14
Keybutton 5-15
Logic Components 5-14
Operator Identification Card Reader 5-21
Power Components 5-10
Power Control Switch 5-14
Secu rity Keylock 5-20
Selector Light-Pen 5-21
Yoke 5-13
Replacement, Component (See removal entry for desired
component.)
Requesting RFTs 2-12
RFTs 2-3
Row Spacing Adjustment 5-8
Row Spacing Problem 3-10 (Diag 3-16)
Scan Lines 3-10 (Diag 3-17)
Security Keylock:
General 6-1
Removal 5-20
Tests 5-1
Selector Light Pen:
General 6-1
Installation 8-2
Removal 5-20
Tests 5-2
Shift Key Module Check 5-6
Size, Image (see Analog Card Adjustments)
Spacebar Assembly:
Checks 5-6
Removal:
Type A 5-17
Type B 5-20
Strobe Check, Keyboard (Type A) 5-5
Symptom Index 1-1, 3-1, 3-3
Symptoms 1-2
Test Card 2-3
Test Pattern APL Keyboard 2-4,2-11 (Diag 2-8)
Test Pattern 10 Numbers 2-12 (Diag 2-10)
Test Pattern 1 2-4,2-5 (Diag 2-4), 3-8 (Diags 3-1,3-2)
Test Pattern 2 2-4,2-7 (Diag 2-5),3-8 (Diag 3-3)
Test Pattern 3 2-4,2-8 (Diag 2-6),3-8 (Diag 3-4)
Test Pattern 5 2-4,2-9 (Diag 2-7)Test Patterns 2-3
Tests:
Keyboard 5-1
Operator Identification Card Reader 5-2
Security Keylock 5-1
Selector Light Pen 5-2
Text Feature:
Keyboard 6-8 (Diag 6-6)
Keyboard Assembly Pin and Terminal Locations 7-19 (Diag 7-21)
Keyboard Codes 6-13 (Diag 6-9), 6-20 (Diag 6-13)
Tools 1-1,2-1
Top Margin Adjustment 5-8
Trouble Analysis 1-1
Troubleshooting Diagram Usage 4-1
Troubleshooting Diagrams 1-1,4-3 through 4-31
Type A Keyboard:
Description 5-5
Locations 7-7 (Diag 7-7), 7-8 (Diag 7-8)
Type B Keyboard:
Assembly 7-16 (Diag 7-18)
Description 5-5
Locations 7-15 (Diag 7-17), 7-16 (Diag;7-18), 7-17 (Diag 7-19),
7-18 (Diag 7-20), 7-19 (Diag 7-21)
Voltage Checks:
Arc Suppression 5-4
General 5-3
High Voltage 5-4
Keyboard 5-5
Low Voltage 5-3
6.3V AC 5-4
Voltage Distribution Board
7-10 (Diag 7-11)
Width Adjustment (see Horizontal Width Adjustment!
WTC Languages:
Character Differences 2-12 (Diag 2-9)
Keyboard Codes 6-22 (Diags 6-14,6-15)
Yoke:
Adjustment 5-7
Problems 3-8 (Diags 3-5, 3-6), 3-11 (Diags 3-19 through
3-23)
Removal 5-13
6.3V AC Check 5-4
-12V Regulator Card:
Adjustment 5-8
Removal 5-10
Index
X-3
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3277 Display Station Models 1 and 2
Troubleshooting Guide
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International Business Machines Corporation
Data Processing Division
1133 Westchester Avenue, White Plains, N.Y. 10604
IBM World Trade Americas/Far East Corporation
Town of Mount Pleasant, Route 9, North Tarrytown, N.Y., U.S.A. 10591
IBM World Trade Europe/Middle East/ Africa Corporation
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