6294007D_CDC_40003 22_Information_Systems_Terminal_III_Hardware_Maint_Mar81 6294007D CDC 40003 22 Information Systems Terminal III Hardware Maint Mar81
6294007D_CDC_40003-22_Information_Systems_Terminal_III_Hardware_Maint_Mar81 6294007D_CDC_40003-22_Information_Systems_Terminal_III_Hardware_Maint_Mar81
User Manual: 6294007D_CDC_40003-22_Information_Systems_Terminal_III_Hardware_Maint_Mar81
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62940007
&J E:\ CONT~OL DATA
~ r:::J CORfO~TION
CDCQl) 40003-22/23
INFORMATION SYSTEMS TERMINAL IB
"
HARDWARE MAINTENANCE MANUAL
(SITE AND' SUPPORT INFORMATION)
CAUTION
Important Instructions
The Internal PLATO-Communications-Network Modem has been approved
by the Federal Communications Commission (FCC) as not being
harmful to the telephone network when connected directly to the
telephone lines.
In order to fully comply with Part 68, FCC
Docket 19528, the following should be read carefully and
followed completely where applicable:
•
The FCC rules require that all direct connections to the
telephone 1 ines be made through standard pI ugs and
jacks. These are the type that are supplied with
40003-22/23 Terminals having internal modems. No connection can be made to party lines or coin lines. Prior to
connecting the device to the lines, you must inform the
local telephone company of the installation required.
You must also:
Call the local telephone company and inform them that
you have an FCC registered device which you wish to
connect to their lines. Give them the l4-digit FCC
Registration Number and Ringer Equivalence Number,
both of which are on the label located on the back of
the terminal.
Inform the telephone company of the jack (connector)
required for the device.
Recently installed telephones are provided with the required jack.
•
After the telephone company has installed the required
jack, connect the terminal in the manner described in
thi s manual.
•
All repairs must be made as described in this manual.
•
If it appears that the terminal is malfunctioning, it
should be disconnected from the telephone line until it
can be determined whether the equipment or the telephone
line is at fault.
If the equipment needs repair, it
should not be reconnected until such repairs are made.
•
The terminal has been designed to prevent harm to the
public network. If, in the case of malfunction, out of
limit parameters are noted by your telephone company,
service may be temporarily discontinued.
•
The telephone company may make changes in its communication facilities, equipment, operations, or procedures,
when such action is required in the operation of its
business and is not inconsistent with the Rules and
Regulations of the FCC. If such changes render any customer's terminal equipment incompatible with telephone
communication facilities, or require that terminal equipment be modified, or otherwise materially affect its use
or performance, adequate notice will be given to allow
you an opportunity to maintain uninterrupted service.
Service Requirements
In the event of equipment malfunction, check with your Control
Data Corporation Sales Representative on the type of service
warranty you have. Under FCC Rules, Part 68, users are not
authorized to maintain their own terminals. Terminals must be
maintained by Control Data maintenance personnel.
Faulty terminals should be reported to the nearest Control Data
Service Center.
HOTLINE
800-328-9114
612-482-2006
(MINNESOTA)
62940007
&J 1::\ CONT"OL DATA
\!1 ~ CO~ORl\TION
CDC® 40003-22/23
INFORMATION SYSTEMS TERMINAL II
HARDWARE MAINTENANCE MANUAL
(SITE AND SUPPORT INFORMATION)
REVISION RECORD
DESCRIPTION
REVISION
01
(07-24-80)
A
(12-02-80)
B
(01-23-81)
C
Preliminary edition.
Manual released.
Includes ECOs 14228, 14277, 14284,
14306, 14326, 14346, and 14369. This edition
obsoletes all previous editions.
Incorporates technical and editorial corrections and
ECO 14388, ECO 14444, and ECO/FCO 14422. This
edition obsoletes all previous editions.
Manual revised to incorporate ECOs 14513 and 14523.
(03-04-81)
D
(03-31-81)
Manual revised to incorporate ECOs 14519, 14532 and
14594.
Publication No.
01989-2
62940007
Address comments concerning this
manual to:
REVISION LETTERS I, 0, Q AND X ARE NOT USED
©
1980, 1981
by Control Data Corporati on
Printed in the United States of America
ii
Control Data Corporation
Technical Publ ications Deportment
2401 North Fairview Avenue
St. Paul, Minnesota 55113
or use Comment Sheet in the back
of th is manual.
MANUAL TO EQUIPMENT LEVEL CORRELATION SHEET
This manual reflects the equipment configurations listed below.
EXPLANATION: Locate the equipment type and series number, as shown on the equipment FeD log, in the list below.
Immediately to the right of the series number is an FeO number. If that number and all of the numbers underneath
it match all of the numbers on the equipment FeD log, then this manual accurately reflects the equipment.
EQUIPMENT TYPE
SERIES
CC629-A
01
02
03
14422
14422
CC629-B
01
02
03
14422
14422
XA244-A
01
WITH FCO'S
COMMENTS
,
XA243-A
01
01987
62940007 B
iii
MANUAL TO EQUIPMENT LEVEL CORRELATION (CONTO)
EQUIPMENT TYPE
SERIES WITH FCO'S
XA247-B
01
XA281-A
01
YA254-A
01
MF401-J
01
COMMENTS
,
MF402-J
iv
01
62940007 B
LIST OF EFFECTIVE PAGES
New features, as well as changes, deletions, and additions to information in this manual are indicated by bars
in the margins or by a dot near the page number if the entire page is affected. A bar by the page number
indicates pagination rather than content has changed.
PAGE
Cover
Title Page
ii
iii/iv
v and vi
vii
viii
ix
x thru xii
xiii thru xiv
xv/xvi
1-1 thru 1-4
1-5
1-6 thru 1-9
1-10
1-11 thru 1-14
1-15
1-16 thru 1-18
2-1 thru 2-3
2-4/2-5
2-6 thru 2-11
2-12
2-13/2-14
3-1
3-2
3-3
3-4 thru 3-7
3-8
3-9
3-10 thru 3-12
3-13/3-14
3-15
3-16/3-17
3-18 thru 3-23
4-1
4-2
4-3
4-4
4-5
4-6
4-7
4-8
4-9
REV
D
B
D
B
A
B
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B
A
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A
B
A
B
A
A
A
B
A
B
A
B
A
B
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B
A
B
A
B
A
B
A
B
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B
A
B
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B
A
PAGE
4-10 thru
4-14 thru
4-17 thru
4-20
4-21 thru
4-26 thru
4-32/4-33
4-34/4-35
4-36 thru
5-1
5-2/5-3
5-4
5-5
5-6
5-7
5-8
5-9
5-10 thru
5-13
5-14 thru
5-17
5-18 thru
5-21
5-22
5-23/5-24
5-25/5-26
5-27/5-28
5-29
5-30
5-31
5-32
5-33
5-34
5-35 thru
5-52 thru
5-55
5-56
5-57
5-58/5-59
5-60
5-61
6-1
REV
4-13
4-16
4-19
B
A
B
A
4-25
4-31
B
A
B
A
4-38
B
B
D
A
D
A
D
B
C
5-12
A
B
5-16
A
D
5-20
A
D
A
D
A
B
C
A
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A
C
B
5-51
5-54
D
A
D
B
A
D
PAGE
6-2/6-3
6-4
6-5 thru 6-7
6-8 thru 6-14
6-15
6-16 thru 6-23
6-24 thru 6-26
6-27 thru 6-38
6-39
6-40 thru 6-44
6-45/6-46
6-47/6-51
6-52 thru 6-55
6-56
6-57
6-58 thru 6-63
6-64/6-65
6-66/6-67
6-68
6-69/6-71
6-72
6-73 thru 6-81
7-1/7-2
7-3 thru 7-5
7-6 thru 7-8
7-9
7-10 thru 7-21
7-22 thru 7-27
7-28/7-29
7-30 thru 7-39
7-40 thru 7-43
7-44/7-45
7-46 thru 7-49
7-50 thru 7-65
7-66/7-67
Comment Sheet
Mailer
Back Cover
REV
B
A
D
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
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A
B
D
B
A
C
B
B
D
-
A
D
A
02092-tA
62940007 D
v/vi
PREFACE
This manual contains information for the on-site and support
maintenance of the CDC® 40003-22/23 Information Systems
Terminal III. Product and associated equipment number correlation is as follows:
Product
Number
Equipment
Number
I-CC629-A
-I
1 XA244-A
40003-22
I-CC629-B
Description
60-Hz Model Terminal
Touchpanel
50-Hz Model Terminal
1
-\
\
\
40003-23
XA244-A
Touchpanel
YA254-A
Modem Cable, Part No. 61406110
In addition, the following options may be added to the terminal:
Product
Number
Equipment
Number
Description
40003-200
XA243-A
16K Random-Access
Memory (RAM) Expansion
40003-201
XA247-B
Internal Modern for PLATO
Network Communications
40003-220
XA281-A
Read-Only Memory (ROM)
Expansion with Timeshare
Program
YA254-A
799-11
Modem Cable, Part No. 61406110
The information in this manual is divided into seven sections:
Section
Section
Section
Section
Section
Section
Section
62940007 B
1
2
3
4
5
6
7
-
General Description
Operation
Installation and Checkout
Theory of Operation
Diagrams
Maintenance
Parts Data
vii
Manuals providing additional information on the terminal and
related devices include:
Title
Publication
Number
40003-22/23 Information Systems Terminal III
Operator's Guide
62940006
PLATO User's Guide
97405900
Tutorial Access Service 1ST III Terminal
User's Guide
84001740
40003-208/209 Graphic Printers Operator's Guide/
Re ference Man ual
62949200
CL607-A/B Graphic Printer and XA262-A Printer
Interface Hardware Maintenance Manual
62949900
40003-203/204/205/206 PLATO Flexible Disk
Subsystem and 40003-200 16K RAM Expansion
Hardware Maintenance Manual
62949100
PLATO Flexible Disk Subsystem
Hardware Operator's Guide
62940005
CN70l-A Acoustic Coupler Special Purpose Manual
62945100
All manuals may be ordered from:
Control Data Corporation
Literature and Distribution Services
308 North Dale Street
St. Paul, Minnesota 55103
viii
62940007
CONTENTS
1.
GENERAL DESCRIPTION
Functions . . . . . . . .
Online Characteristics
Online Characteristics
Major Assemblies
Display Monitor
•••
Operator Panel . • • •
Touchpanel •
•••
Keyboard
.
.
•
•
. . . . . . . . . . . . . .
in PLATO Network • • • • •
in Data Services Network
• • ••
• • • • • •
• •••••••••••
• • • • • • • • • • • • • •
•• .
•••••••
• ••
•..••••••••.
Enclosure
•••••• . • •
• • • • • • •
Controller Board •
• • • •
• • • •
Video Board
• • • • • • • . . • • • • • • • •
Optional Modem/DAA Board (PLATO Network Use Only).
Power Supply . • • • . • • • • • • • • •
•.•
External Interfaces •
• • . • • • • • • • • •
Phone/Line • . • •
. • ••
••••••
Video Out
• • • •
. • • • • • • • • • • •
Serial . . . . . .
. . . . .
ASCII/PLATO Comm (Communications)
•••
Characteristics with an ASCII Network
Characteristics with PLATO Network • • •
Parallel • • • • • • • • • • • • •
Equipment Specifications
. ••
• ••.•••
Physical Specifications
• • • ••
•••.••
Electrical Specifications • • • • • • • • • • • •
Environmental Specifications
• • • • • • •
I/O Cable, Grounding, and Tool Requirements
•••
I/O Cables
• ••
• • • • • • • • • • •
Grounding
•••
••••• • • • • • • • • • •
Tool s
.. . . . . . . . .
... . .
2.
1-1
1-2
1-3
1-4
1-4
1-4
1-5
1-5
1-6
1-6
1-6
1-7
1-8
1-8
1-8
1-9
1-9
1-11
1-11
1-13
1-14
1-16
1-16
1-16
1-16
1-17
1-17
1-17
1-17
OPERATION
External Control sand Ind ica tors
Keyboard
•
•
•
•
•
•
•
.
•
.
• • • ••
.
••
•••
••••••
On/Off Circuit Breaker • • • • • • • • • . • • • •
Brightness Control
••••••
••••••
TALK/DATA Switch •
•••••••••
•• •
RESET Switch • • • • • • • • • • • • • •
• ••
Selection Switches Behind Protective Door
• • • •
Light-Emitting Diodes (LEDS) • • •
• •••••
Internal Controls and Indicators • • • • • • • • • •
Communications Loopback Switch • • • • •
•••
Refresh Memory Write Switch • • • • • • • • • • •
Flood Screen Switch • • • • • • • • • • • • • • •
S2, S5, and ROM Selection Switches • • • • • • • •
Display Board Controls • • • • • • • • • • • • • •
Power-Supply Board Controls and Indicators • • • •
62940007 B
2-1
2-2
2-2
2-2
2-2
2-3
2-4
2-8
2-8
2-10
2-10
2-10
2-11
2-14
2-14
ix
3.
INSTALLATION AND CHECKOUT
era ting . . . . . . . . . . . . . .
.. . . .
Uncra ting • • • • • • • • •
• • • • •
Installation • • • • • • •
•••••••
Preparing Terminal • • • • • • •
•••••••
Installing Options
••.
• ••••••
Installing RAM Expansion Option • • • • • • • •
Installing ROM/EROM Expansion Option
••.
Installing Internal Modem/DAA Option • • •
Installing Cabling • • • • • • • • • . • •
Communications via External Modem • • • . • • •
Communications Via Internal Modem • • • • • • •
Communications Via Internal/External Modem
Communications Via Long-Line Receiver/Driver
Setting Internal Switches . • • • • • • • • •
Checkout
4.
•••
•
•
•
•
.
.
•
.
•
•
•
•
•
•
.
.
.
.
.
THEORY OF OPERATION
Con troller
.. ..
.....•.......
Microprocessor •
•••••••
Read/Write Memory Transfers
Instruction Fetching • • •
•••
Instructed Reads and Writes • • • • • •
Input/Output Functions
••••• • • • • • • •
Input 0016 - Read Maintenance and Load
Switches • • • • • • • • • • • • • • •
Output 00 16 - Load Maintenance Register
Input 0116 - Read Keyboard Data
Output 0116 - Load PLATO Transmitter Lower
Bi ts . . . . . . . . . . . . . . . . . . .
Input 0216 - Read Touchpanel Data • • • •
Output 0216 - Load PLATO Transmitter Upper
Bi ts . . . . . . . . . . . .
.....
Input 0316 - Read Lower ID • •
•••••
Output 0319 - Bulk Write/Erase and Video
Enable/DIsable • • • • • • • • • • • • • •
Input 04 16 - Read Upper ID • • • •
•••
Output 04 16 - Load Interrupt Mask
. • •
Input 05 16 - Read Internal Switches
Output 0516 - Miscellaneous Control
••
Input 0616 - Read Communication Switches
and Status • • • • • • • • • • • • • • • •
Output 0616 - Load ASCII Communication
Da ta Ra te s • • • • • • • • • • • • • • • •
Input 07 16 _ Read Controller Status • • • •
Output 0716 - Load Serial I/O Data Rate
Input 0816 - Read PLATO Communication Data •
Input 1016 - Read ASCII Communication Data •
Output 1016 - Load ASCII Communication Data.
Input 1116 - Read ASCII Communication Status
x
3-1
3-1
3-3
3-3
3-3
3-4
3-6
3-7
3-11
3-11
3-13
3-14
3-16
3-16
3-21
4-2
4-3
4-4
4-4
4-4
4-5
4-6
4-6
4-7
4-8
4-8
4-8
4-9
4-9
4-10
4-10
4-11
4-12
4-13
4-14
4-16
4-17
4-18
4-18
4-19
4-19
62940007
Output 1116 - Load ASCII Communication
Control
••••••••••••
• • •
Input 12 16 - Read Serial I/O Data
•••
Output 12 16 - Load Serial I/O Data • • • • •
Input 1316 - Read Serial I/O Status
••
Output 1316 - Load Serial I/O Control
•••
Input 2Y/3Y16 - Input from Parallel Channel.
Output 2Y/3Yl6 - Output to Parallel Channel.
PLATO Commun ica tion Circuits • • • • ••
• • •
PLATO Receiver
• • • • • • • • • • • •
Word Detection •
.••
. ••••••
Word Assembly • • • . . • • . • • • • • • •
PLATO Transmitter • • • • • •
• ••••••
Word Transfer/Ser ial iza tion
•••
.••
Word Formatting • • • • • • • . • • • . • •
ASCII Communication Circuits. • •
• .•.••
ASCII Receiver • • • • •
••••••.••
ASCII Transmitter • • • • ••
• ••••••
Serial Interface Circuits
• • •
• • • • •
Parallel Interface Circui ts
•••••••
Interface Signals • •
• • • • • • • • •
Timing
......
. . . . . . . .
Output Exchange
• ••
••••
.••
Input Exchange • • • • •
• • • . • •
Video Board . . . . . . . . . . . . . . . . . . . . •
Memory Structure • • • • • •
•••••••••
Program Memory • • • • . • • • • • • • • • • •
Display-Refresh Memory • • • • • • •
. ••
Display Refresh • • • • • • • • • • • •
• • •
Refresh-Memory/Display Relationship •
•••
Display-Refresh Timing . • • • • •
••••
Optional Modem/DAA Board (PLATO Network Use Only)
Operator Panel
• ••
•••• •
• • •
Touchpanel
••••••
•••
•••
•••
Keyboard
••••.•••••
Display Monitor •
Power Supply Board
5.
.
•
•
•
•
.
.
•
•
•
•
DIAGRAMS
Logic Diagram Set Contents Sheet
6.
•
•••
• ••
• •••••
••••••••••• • • • • • •
4-19
4-19
4-19
4-20
4-20
4-20
4-20
4-20
4-20
4-21
4-21
4-22
4-22
4-23
4-23
4-24
4-25
4-25
4-26
4-26
4-27
4-27
4-30
4-31
4-31
4-32
4-32
4-32
4-32
4-34
4-35
4-36
4-36
4-37
4-38
4-38
..........
5-2
MAINTENANCE
· ·
Suggested Emergency Maintenance Procedure • • •
•
Before Leaving for Customer Site •
•••
Upon Arriving at Customer Site • • • • • • •
Maintenance Aids
.••••••••••••••
Resident Diagnostics • • • •
••••••
RAM Te sts • • • • • • • .. • • • • • •
Interface Tests • • • •
• •• •
PLATO Communications Test • • • •
•
···
·· ·· ··
. . ·· ·· ··
. . · · ··
62940007
6-1
6-1
6-2
6-3
6-3
6-3
6-4
6-4
xi
ASCII Communications and SERIAL-Interface
Communications Tests • • • • • • • • • • •
CRT Alignment, Touchpanel, and Keyboard Tests.
PLATO System Diagnostic (DIAG) • • • • • • • •
Preventive Maintenance • • • • •
••••••••
Special Tools and Test Equipment • • •
• • •
MOS Circuit Handling Precautions • • • • • • • • • •
Diagnostic and Corrective Maintenance Procedures
SAM Format • • • • • • • • • • • •
• •
Use 0 f SAMs • • • • • • • • • • • • • • • • • • •
Organization of SAMs and Procedures •• • • • • •
Procedure 1 - Turning Terminal On/Off
•••
Procedure 2 - Executing Resident Diagnostics
Procedure 3 - Removing Hood and Bezel • • • • •
Procedure 4 - Adj usting Video • • • • • • • • •
Procedure 5 - Adjustment Yoke Centering Rings •
Procedure 6 - Replacing Video • • • • • • •
Procedure 7 - Replacing Controller Board •• •
Procedure 8 - Replacing Integrated-Circuit
Ch ips . . . . . . . . . . . . . . . . . .
Procedure 9 - Checking and Adjusting Power
Supply Voltages • • • • • • • • • • • • •
Procedure 10 - Replacing Power Supply Board
Procedure 11 - Replacing Line Filter, Power-Cord
Receptacle, and Stepdown Transformer • • • •
Procedure 12 - Replacing ON/OFF Circuit
Breaker • • • • • • • • • • • •
Procedure 13 - Replacing Keyboard Assembly and
Components • • • • • • • • • • • • • • • • •
Procedure 14 - Replacing Operator Panel • • • •
Procedure 15 - Replacing Operator Panel LEDs
Procedure 16 - Replacing BRIGHTNESS Control • •
Procedure 17 - Replacing Protective Door • • •
Procedure 18 - Replacing Matched Yoke/CRT or
Display Board • • • • • • • • • • • • • • • •
Procedure 19 - Replacing Voltage Doubler/
Bleeder Assembly •• • • • • • • • • • • • •
Procedure 20 - Replacing Touchpanel • • • • • •
Procedure 21 - Replacing Internal Modem Board •
Procedure 22 - Defining Acceptable Display
....
Quality- . . . . . . . • • . • . . . . . . . .
7.
6 ... 8
6-9
6-10
6-37
6-37
6-42
6-45
6-49
6-50
6-52
6-54
6-58
6-61
6-63
6-66
6-67
6-70
6-71
6-72
6-73
6-73
6-76
6-76
6-79
6-79
PARTS DATA
Genealogy 1ST-III 50 & 60 Hz • • • • • • • • • • • •
Spare Parts List ASCII 1ST-II Basic Terminal • • • •
Spare Parts List Touch Panel Option • • • • • • • • •
Spare Parts List PLATO Communication Network Modem
Spare Parts List Memory Expansion Option •• • • • •
Spare Parts List Timeshare ROM Option
••••• •
ASCII Terminal 60 Hz TLA
• • • • • •
••••
ASCII Terminal 50 Hz TLA • • • • • • • • • • • • • •
Panel & Gasket Assembly • • • • • • • • • • • • •
xii
6-4
6-5
6-5
6-6
6-7
6-7
6-8
7-3
7-4
7-6
7-7
7-8
7-9
7-10
7-16
7-22
62940007
A.C. Entry Assy • • • • • . • • • • • • • • • • • • •
P.C. Card Assembly, OADD Operator Panel (2nd
Generation) • • • • • • . • • • • • • • • • • • • •
Card Assembly OABD Video Cont Module W/Firmware • • •
P.C. Card Assembly OABD, Video Controller • • • •
P.C. Card Asembly, OACD Controller Module • • • • • •
P.C. Card Assembly, 8CHD (Modem 150/1200 BPS) • • • •
P.C. Card Assembly, OAGD Modem Line Filter
•••
P.C. Card Asembly, 9CAD ASCII 1ST Power Supply • • •
Cable Assy Data Set •
•••• • • • • • • • • • •
Cable, Display Logic
• • • • • • •
• •.
Cable Assy-Power Conn
• • • • • • • • • • • •
Cable Assy-DC Power •
. • • • • ••
•••
Cable Assy-Logic Signals
••••••
••••••
Cable Assy-Video Output • • • •
••••• • • • •
Cable Assy-AC Input • • • • • • • • • • • • • • • • •
Cable Assy-AC Entry, 60 Hz
•••••••••••
Cable Assy-AC Entry, 50 Hz • • • • • • • • • • • • •
7-24
7-26
7-28
7-30
7-34
7-40
7-44
7-46
7-50
7-52
7-54
7-56
7-58
7-60
7-62
7-64
7-66
FIGURES
1.
GENERAL DESCRIPTION
1-1
1-2
1-3
1-4
1-5
1-6
1-7
2.
.···
·· ·· ··
·· ·· ··
1-2
1-3
1-5
1-8
1-10
1-13
1-14
External Controls and Indicators
•• . • •
Se1eotion Switches Behind Protective Door •
Internal Controls and Indicators
• • • • •
Decal Inside Hood • • • • • • • • • • • • • • •
Power-Supply Board Controls and Indicators
• •
2-1
2-5
2-9
2-11
2-14
OPERATION
2-1
2-2
2-3
2-4
2-5
3.
.
..... ... .....
.... ....
Terminal Configured in PLATO Network
Terminal Configured in Data Services Network
Terminal
•
•
External Interface Connectors
•
Serial Word Format
• • •
•
Receive Word Format in PLATO Network
Transmit Word Format in PLATO Network
INSTALLATION AND CHECKOUT
3-1
3-2
3-3
3-4
3-5
3-6
3-7
62940007 B
Terminal Packaging
•• • • • • • • • • • •
Video Board Locations for RAM Expansion • •
Equipment Identification Label and FCO Log
Placement for Memory Expansion Options • • •
Video Board Locations for ROM/EROM Expansion
Internal Modem/DAA Installation • • • • • •
Modem Shield and Board Installation • • • • • •
Communications Via External Modem • • • • • • •
3-2
3-5
3-5
3-7
3-8
3-10
3-12
xiii
3-8
3-9
3-10
3-11
4.
4-10
4-11
4-12
4-13
4-14
4-15
4-16
3-13
3-14
3-17
3-20
····
· ··
···
·
··
··
··
··
··
·
·
··
·
..···········
· · · ·· ·· ··
··· ·· ·· ·· ·· ··
····
···
·
··
······
······
Terminal Block Diagram
Data Bus Word for Input 02 16
Significance of S5 Switches
PLATO Receive Word Format
Receive PLATO Word Transfer
Transmit PLATO Word Transfer
PLATO Transmit Word Format
ASCII Receiver Word Format
ASCII Transmitter Word Format
External Input/Output Timing (No Extra Wait
States)
External Input/Output Timing with Delayed
Device Ready (Extra Wait States)
External Input/Output Timing with Device Not
Ready (Timeout)
Memory Structure and Address Assignments
Refresh-Memory/Display Relationship
Scan Line Timing (Composite Video Signal)
Frame Timing (Composite Video Signal)
Keyboard Codes and Legends
·
·
··········
·
·
·
·
·
·
······
·
·
·
·
4-1
4-8
4-11
4-21
4-22
4-23
4-23
4-24
4-25
···
4-28
·
4-29
·
·
·
·
··
··
·
· ··
· ·
4-30
4-31
4-33
4-34
4-35
4-37
MAINTENANCE
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
6-14
6-15
6-16
6-17
6-18
6-19
6-20
6-21
xiv
Via Internal Modem • • • • • • •
Via Internal/External-Modem
(2 sheets) • • • • • • • • •
Via Long-Line Receiver/Driver
Loopback Switch • • • • • • • •
THEORY OF OPERATION
4-1
4-2
4-2.1
4-3
4-4
4-5
4-6
4-7
4-8
4-9
6.
Communications
Communications
Combination
Communications
Communications
·······
········
··
·······
· · · · · ·· ·· ·· ··
···
· · · · · · · · ··
······
.·········
·······
········
·
· ·· ·· ··· ·· ·· ·· ··
·· ·· ·· · · ·· · ·
· ····
· · · ·· · · · ·
· · · ·· ·· ·· ··
··
······
····
····
· · · · ·· ·· ·· ··
·
··
········
··········
Example of a SAM
Organization of SAMs and Corrective Maintenance
Procedures
Keyboard Codes and Legends
RAM Chip Location
Hood Removal
Bott0m of Terminal
Bracket Screws Removal
Display Board
CRT Centering Rings
video and Controller Board Locations
Video Board
Controller Board
Pluggable Chips on Controller Board
Pluggable Chips on Video Board
Pluggable Chip on Monitor Display Board
Test Points for +5 V and -12 V Controller Board
Power Supply Board Adjustments
Test Points for +55 V on Display Board
Test Points for -5 V and +12 V on Video Board
Monitor Chassis Removal
Power Supply Board Removal
6-9
6-10
6-39
6-42
6-43
6-43
6-44
6-48
6-49
6-51
6-52
6-54
6-56
6-57
6-57
6-58
6-59
6-60
6-61
6-62
6-63
62940007 B
6-22
6-23
·
· ·
· · · · · · ·· · ·· ··
· · · · ··· ·· ··· ··· ··· ··· ··· ···
·
. . . . · · ·· ·· ·· · ·
·
· ·· · ·· ·· ·· ·· · ·· · ·· · ·
··· ······
AC Entry Panel Removal
•
• •
• • • • •
•
Stepdown Transformer Removal (Appl icable Only
to In terna tional Units)
• •
ON/OFF Circui t Breaker Replacement •
Keyboard Assembly Removal
Keyswitch Replacement
Operator Panel Removal
•
LEDs on Operator Panel
•
• •
CRT Removal
•
•
•
Front Chassis View
•
•
•
•
Touchpanel Removal
Touchpanel Alignment Marks
•
Orthogonality and Linearity of Alignment Pattern
~
6-24
6-25
6-26
6-27
6-28
6-29
6-30
6-31
6-32
6-33
6-64
6-66
6-67
6-68
6-69
6-70
6-71
6-74
6-75
6-77
6-78
6-80
TABLES
1.
GENERAL DESCRIPTION
1-1
1-2
1-3
1-4
2.
Function of Switches Behind Door • • • • • • •
Load Switch Selections • • • • • • • • • • • •
Meaning of LEDs During Normal Operation • • • •
Function of Internal Selection Switches • • • •
Interface Signals Affected by Switch S2-7 •
2-5
2-7
2-8
2-12
2-13
INSTALLATION AND CHECKOUT
3-1
3-2
4.
1-10
1-12
1-15
1-17
OPERATION
2-1
2-2
2-3
2-4
2-5
3.
Serial Connector Pin Assignments • • • • •
ASCII/PLATO Comm Connector Pin Assignments
Parallel Connector Pin Assignments
• • • •
Terminal I/O Cables • • • • • • • • • • • •
Setting S2 and S5 Selection Switches
Setting Selection Switches Behind Door
·....
3-18
3-22
THEORY OF OPERATION
4-1
4-2
4-3
4-4
4-5
4-6
4-7
62940007
···
··· ··
···· ·
... · ·· · ·· ·
· ·· ····
·· · · · ·· ··
Input/Output Functions
•
•
• •
Data Bus Word for Input 0016 •
• • •
Data Bus Word for Output 0016 • • • • • •
Bulk Write/Erase and Video Enable/Disable
Function •
•
•
•
•
•
•
Masked Interrupt Conditions
•
•
Data Bus Word for Output 05 16
•
•
Data Bus Word for Input 06 16
•
• • • •
·
··
··
4-5
4-6
4-7
4-9
4-10
4-12
4-14
xv
4-8
4-9
4-10
4-11
6.
4-17
4-18
Second Indications for Errors 03, 04, and 05
Video Adjustment Controls • •
• • • • • • •
6-40
6-46
PARTS DATA
7-1
xvi
4-15
4-16
MAINTENANCE
6-1
6-2
7.
ASCII Receive Data Rate Selection • • • • •
ASCII Transmit Data Rate Selection • • • • • •
Data Bus Word for Input 07 16 • • • ••
••
Serial Interface Data Rate Selection •• • • •
Explanation of Column Headings of ComputerGenerated Assembly Parts Lists • • • • • • •
7-1
62940007
I
GENERAL DESCRIPTION
This section describes the functions, major assemblies, external
interfaces, and equipment specifications of the terminal, as
well as its I/O cable, grounding, and tool requirements.
FUNCTIONS
The terminal is a controlware-driven, graphic/alphanumeric display device that can operate in either the CDC® Data Services
Network or the CDC® PLATO Education Network.* In addition,
timeshare-mode controlware available from the Data Services
network gives the terminal the capability to operate in other
networks that use ASCII coded communications.** This can also
be accomplished without accessing the Data Services network if
the terminal is configured with a local controlware source (a
flexible disk drive or additional ROM/EROM containing resident
controlware).
Controlware instructions establish all functional characteristics of the terminal.
The terminal automatically loads these
instructions following a power on.
This occurs after the load
source has been selected, and if applicable, after network
communications has been established.
Depending on the setting
of switches on the terminal, the load source may either be
selected automatically or be selected manually through keyboard
or touchpanel entries.
The possible load sources are:
•
PLATO host computer - downline loads PLATO network
controlware.
•
Data Services host computer - downline loads an ASCII
version of PLATO controlware, controlware for graphics
mode, and controlware for timeshare mode.
•
Flexible disk - loads directly from an associated
flexible disk drive.***
•
Internal ROM/EROM - loads from optional ROM/EROM within
the terminal.
*PLATO is an acronym for Programmed Logic for Automated
Teaching Operations.
**ASCII is an abbreviation of American Standard Code for Information Interchange, which is the type of coding used by the
Data Services network.
***Loading from flexible disk requires 16K of additional RAM in
terminal.
62940007 B
1-1
The following paragraphs describe the basic online characteristics of the terminal as it operates in the PLATO or Data
Services network.
ONLINE CHARACTERISTICS IN PLATO NETWORK
When online with the PLATO network (figure 1-1), the terminal
functions as a standard PLATO terminal with the following
characteristics:
•
Sends keyboard and touchpanel input to the host computer
for interpretation before data returns for display
•
Displays data from the host computer in page fashion
•
Uses a screen format of 32 lines by 64 characters per line
•
Upon operator request, transfers screen contents to an
associated graphics printer for copying or sends data to
or inputs data from an associated flexible disk drive.
PLATO HOST
COMPUTER
i-rI
1
PLATO
SITE
CONTROLLER
l-r--
FLEXIBLE,
DISK
DRIVE
OPTIONAL INTERNAL MODEM
ASC II/PLATO
COMMUNICATIONS
INTERFACE
PARALLEL
INTERFACE
*
GRAPHIC
PRINTER
._
TERMINAL
SERIAL
INTERFACE
*
FOR FUTURE SUPPORTED ~
SERIAL-COMMUNICATION
DEVICE
* AVAILABLE PERIPHERALS
Figure 1-1.
1-2
03916-1
SUPPORTED IN APPLICATION
Terminal Configured in PLATO Network
62940007B
ONLINE CHARACTERISTICS IN DATA SERVICES NETWORK
When online with the Data Services network (figure 1-2), the
terminal can operate in any of the following modes:
•
PLATO mode - functionally the same as if online with the
PLATO network
•
Timeshare mode - simulates the operation of Teletype
equipment. Once the controlware is loaded, the terminal
can be put online with a different ASCII network that has
compatible operation. Basic characteristics are:
Switch selection determines if keyboard input is displayed when returned by the host computer or displayed
simultaneously as it is transmitted (the latter is
applicable when mode is run on Data Services network)
Switch selection determines whether parity generation/
checking is even, odd, or none (even parity is applicable when mode is run on Data Services network)
Alphanumeric data appears in scroll fashion in a
34-line by 85-character-per-line format
An associated graphics printer can print the data
received by the terminal or copy screen contents
Touchpanel entries and use of a flexible disk drive
are not supported
TERMINAL
ASCII/PLATO
COMMUNICATIONS
INTERFACE
DATA
SERVICES
NETWORK
FLEXIBLE
DISK
DRIVE
PARALLEL
INTERFACE
GRAPHIC
SERIAL
INTERFACE
*
FOR FUTURE SUPPORTED
SERIAL-COMMUNICATION
DEVICE
·ONLY SUPPORTED IN PLATO MODE
Figure 1-2.
62940007 B
"SUPPORTED IN ALL MODES
03916
Terminal Configured in Data Services Network
1-3
•
Graphics mode - simulates the composite operation of
Tektronix 4010 and 4014 Graphic Terminals. Basic
characteristics are:
Graphics are composed using the touchpanel for course
positioning and the keyboard for fine positioning
Supports a graphics printer and has the switchselectable features described for timeshare mode
Alphanumeric data appears in page fashion in a 34-line
by 85-character-per-line format
MAJOR ASSEMBLIES
The following paragraphs describe the major assemblies of the
terminal (figure 1-3). This includes the display monitor,
operator panel, touchpanel, keyboard, enclosure, controller
board, video board, optional modem/DAA board (PLATO network use
only), and the power supply.
DISPLAY MONITOR
The display monitor is a noncomposite video unit that receives
vertical and horizontal sync pulses to deflect an electron beam
in the cathode-ray tube (crt). The video signal received is
used to unblank (illuminate) the crt at proper times to present
data on the screen.
The unit consists of a circuit board, yoke,
flyback transformer, high-voltage rectifier, and a crt.
The active display area consists of a 512 by 512 matrix that is
refreshed in an noninterlaced mode. These 262,144 matrix elements are individually programmable (illuminated or black). The
active display area is approximately 216 mm by 216 mm (8.5 in by
8.5 in).
OPERATOR PANEL
This panel, located to the right of the screen, contains all the
external indicators and controls, except the ON/OFF circuit
breaker. These indicators and controls are described in Operation, section 2.
1-4
62940007 B
Figure 1-3.
Terminal
TOUCH PANEL
The touchpanel forms a 16 by 16 matrix of 13 rom by 13 mm (0.5 in
by 0.5 in) square touch-sensitive areas, overlaid on the display
screen. In modes supporting touchpanel input, pressure applied
to the touchpanel surface interrupts an X/Y scanning mechanism.
When a touch is detected, the terminal captures the intersecting
X/Y coordinates for processing and produces an audible tone.
KEYBOARD
The terminal keyboard provides for operator entry of data and
control codes. When a key is pressed, an 8-bit code is
generated at the controller board of the terminal.
In most
cases, the input goes to the central computer for interpretation
before data returns to the terminal for display.
62940007
1-5
ENCLOSURE
The terminal is housed in a four-part enclosure that consists of
a base, hood, bezel/keyboard cover, and display/touchpanel mask.
All components, except the touchpanel, BRIGHTNESS control, and
operator panel, fasten to the base. The removable hood gives
access to all the modules of the terminal, except the keyboard,
touchpanel, and operator panel.
CONTROLLER BOARD
The controller board performs the control functions and processing required in input/output operations. Input/output operations include communications with the connected network,
communications with attached peripherals, touchpanel and keyboard entries, and read/write transfers with memory on the video
board. Examples of control functions are:
•
•
•
•
Instruction decoding and execution
Communications formatting
Interrupt recognition ~nd processing
Timing generation for serial/parallel-communication
interfaces
VIDEO BOARD
The video board provides timing and memory to support the controller board an? the display monitor. Features include:
•
32K 8-bit words of RAM for display refresh
•
16K 8-bit words of RAM for loading controlware programs
•
Provision for 16K more RAM for additional loading storage*
*Supporting circuitry for memory expansion is already on the
board, including sockets where the memory chips are inserted.
1-6
62940007 B
•
4K 8-bit words of ROM/EROM that contains a resident
diagnostic and loader firmware program
•
Provision for up to 16K more ROM/EROM (in 4K increments)
for additional resident programs*
•
Timing generation for the display, memory, and the controller board
•
Composite video output for external devices
OPTIONAL MODEM/DAA BOARD (PLATO NETWORK USE ONLY)
The optional modem/DAA (data-access arrangement) board is a FSK
(frequency-shift-keyed), asynchronous internal modem for
communicating with a PLATO site controller via a dial-up
telephone line. Features include:
•
Switch controlled connection with telephone line to
facilitate use of a telephone plugged into the PHONE jack
at back of terminal
•
Full-duplex operation using frequency multiplexing on a
two-wire, unconditioned telephone line
•
Primary (receive) channel l300-Hz mark, 2l00-Hz space
•
Secondary (transmit) channel 390-Hz mark, 490-Hz space
•
Receive data rate up to 1200 bps
•
Transmit data rate up to 150 bps
•
Line impedance of 600 ohms
•
Transmitter output level of -9 dBm (+0, -4 dBm)
•
Receiver input level of -10 dBm to -43 dBm
*Supporting circuitry for memory expansion is already on the
board, including sockets where the memory chips are inserted.
62940007 B
1-7
POWER SUPPLY
The power supply operates with 120-V ac, SO/60-Hz input, which
meets domestic requirements. In international units, a stepdown
transformer is included to allow use of the same power supply.
Regulated output voltages are:
•
•
•
•
•
+SS volts
+12 volts
-12 volts
+S volts
-S volts
EXTERNAL INTERFACES
The following paragraphs describe the external interfaces of the
terminal. The interface connectors (figure 1-4) are on the
lower-rear panel of the terminal and are labeled PHONE, LINE,
VIDEO OUT, SERIAL, ASCII/PLATO COMM, and PARALLEL. The PHONE
and LINE telephone "jacks are only on units that have the internal modem/DAA board installed.
ASCII/PLATO
COMM
CONNECTOR
}-5
f)
UNE
~
--l-
TELEPHONE
JACK
PARALLEL
CONNECTOR
i~
I) c«
~ t{
SERIAL
CONNECTOR
t
C
1P
-/--;-~""""
VIDEO OUT
CONNECTOR
03331-7
Figure
1~4.
External Interface Connectors
PHONE/LINE
These telephone jacks connect to the site telephone equipment
when terminal communications are with the PLATO network through
the internal modem. The connection of the telephone line to the
1-8
62940007 B
LINE jack can either be direct via the telephone wall jack or
indirect via a CDC CN70l-A Acoustic Coupler. When the
connection is direct, the site telephone is plugged into the
PHONE jack.
Use of the plugged-in telephone is enabled through the TALK/DATA
switch on the terminal.
The switch internally disconnects the
telephone line from the modem and connects the line with the
telephone. This also occurs automatically when the terminal is
powered off.
VIDEO OUT
The VIDEO OUT connector provides a composite video signal of the
contents of the screen that meets the RS-170 standard.* This
output can either drive a video hardcopy unit or a special
monitor. Maximum length of the coaxial cable used in the
connection is 150 m (500 ft).**
SERIAL
This connector allows the terminal to interface with a serialcommunication device.
Characteristics are:
•
Asynchronous, full-duplex operation with voltage signals
that meet RS-232-C/CCITT V.24 and V.28 standards***:
Receiver levels of -25.0 V to +0.8 V equals mark or
off; +2.0 V to +25.0 V equals space or on
Transmitter levels of -12.0 V to -3.0 V equals mark or
off; +3.0 V to +12.0 V equals space or on
•
Controlware-selectable word length, parity, and stop bits
(figure 1-5 shows word format)
•
Controlware-selectable receive/transmit rates of 37.5,
75, 150, 300, 600, 1200, 2400, 4800, 9600, or 19 200 bps
*RS-170 is the Electronic Industries Association standard for
electrical performance of monochrome television studio
facilities.
**Maximum length is dependent on cable characteristics, signal
termination, and receiver design.
***RS-232-C is the Electronic Industries Association standard for
signal interchange between data terminal equipment and data
communication equipment.
CCITT V.24 and V.28 are comparable
European standards.
62940007 B
1-9
o
®
@
@
I START BIT (SPACE OR HIGH)
5,
6~ 7,
OR 8 DATA BITS (I=MARK OR LOW, O=SPACE OR HIGH)
lOR NO PARITY BIT (EVEN OR ODD)
I, 1.5, OR 2 STOP BITS (MARK OR LOW)
Figure 1-5.
03542
Serial Word Format
Maximum length of the cable used in the serial interface is 15 m
(50 ft).
Table 1-1 gives the pin assignments.
TABLE 1-1.
PIN NUMBER*
SERIAL CONNECTOR PIN ASSIGNMENTS
SIGNAL
RJ3-1
Safety Ground
RJ3-2
Transmit Data
RJ3-3
Receive Data
RJ3-4
Request to Send
RJ3-5
Clear to Send
RJ3-6
Data Set Ready
RJ3-7
Signal Ground
RJ3-8
Carrier Detect
RJ3-20
Data Terminal Ready
*Connector has 25 pins and unlisted pins
are not used (open).
1-10
62940007
ASCII/PLATO COMM (COMMUNICATIONS)
When the internal modem is not used, this interface conducts the
network communications for the terminal. This can be either
with an ASCII communications network such as the Data Services
network or with the PLATO network. Communications compatibility
with site facilities and either type network is established
through switch settings on the terminal. Communication
facilities accommodated are:
•
RS-232-C/CCITT V.24 and V.28 compatible signals for
interfacing with an external modem.
The cable connecting
the modem can be up to 15 m (50 ft) long.
•
Current-based signals for interfacing with communications
equipment that use long-line communications. This signal
interchange occurs through an optically-coupled receiver
and a transmitter that has an output level of 24 rnA
minimum to 55 rnA maximum.
For data rates not exceeding
1200 bps, the cable for the connection can be up to
3048 m (IO 000 ft) long.
Table 1-2 lists the pin assignments and the following paragraphs
describe the characteristics of the interface with each type of
network.
Characteristics with an ASCII Network
With an ASCII network, the characteristics of the ASCII/PLATO
COMM interface are:
•
Asynchronous, full-duplex operation
•
Switch-selectable receive/transmit rates that are in
effect except when reselected by controlware. Selection
includes rates of 75/75, 150/150, 300/300, 600/600,
1200/75, ;200/1200, or 2400/2400 bps.
In addition,
switches can be set so rates are determined by external
receive/transmit clocks.
•
Controlware-selectable receive rate and transmit rate
with separate selections of 75, 150, 300, 600, 1200,
2400, 4800, 9600, or 19 200 bps.
In addition,
controlware can select rates provided by external
receive/transmit clocks.
•
Automatic formatting of communications as follows, except
when reselected by controlware:
One start bit
Seven data bits that are ASCII encoded
One parity bit
One stop bit
62940007 B
1-11
TABLE 1-2.
I
I PIN NUMBER
I
ASCII/PLATO COMM CONNECTOR PIN ASSIGNMENTS
SIGNAL
,------+---'
I
I
I
I
I
I
RJl-l
RJl-2
RJl-3
RJl-4
RJl-5
RJl-6
'RJl-7
I RJl-8
I RJl-9
I RJl-lO
I RJl-ll
I RJl-12
RJl-13
RJl-14
RJl-15
RJl-16
RJl-17
RJl-18
RJl-19
RJl-20
RJl-21
RJl-22
RJl-23
RJl-24
RJl-25
Protective Ground
Primary Channel Transmit Data
Primary Channel Receive Data
Primary Channel Request to Send
Primary Channel Clear to Send
Data Set Ready
Signal Ground
Primary Channel Carrier Detect
Not used
Not used
Not used
Not used
Secondary Channel Clear to Send
Secondary Channel Transmit Data
Transmit Clock
Not used
Receive Clock
Not used
Secondary Channel Request to Send I
Data Terminal Ready
I
Long Line Transmit
I
Long Line Transmit Return
I
Long Line Receive
I
Long Line Receive Return
I
Not used
I
,-----.------ t
NOTES
I
___I
I
,
1, 3, and 4
4
1 and 2
1
7
I
I
I
I
I
I
I
I
7
Open
Open
Open
Open
1
1, 3, and 4
3 and 4
Open
4
Open
1 and 2
5
6
6
6
6
Open
Notes:
I
1. Primary/secondary channel is switch selectable.
2. Request to Send signal of selected channel is governed
by resident loader program during controlware loading,
then by controlware.
3. With PLATO network, internal/external transmit clock
is switch selectable.
4. With ASCII network, use of an external transmit/
receive clock is switch or controlware selectable.
5. Switch selectable - either constantly on or usually
on and governed by resident loader program during
controlware loading, then by controlware.
6. Unique to long-line communications.
7. With a modem, these signals must be on for terminal
to receive.
1-12
I
I
I
I
I
I
1
I
I
I
I
I
I
I
I
I
I
I
I
62940007 B
•
Controlware-selectable formatting of communications in
words of:
One start bit
Seven data bits plus a parity bit or eight data bits
and no parity
One stop bit
•
Automatic selection of even parity except when reselected
by controlware (even, odd, or none) or when in timeshare
or graphics mode where even, odd, or no parity is switch
selectable
Characteristics with PLATO Network
With the PLATO network, the characteristics of the ASCII/PLATO
COMM interface are:
•
Asynchronous, full-duplex operation with an automatic
receive rate of 1200 bps
•
Switch-selectable transmit rate of 75, 120, or 1200 bps
or a rate provided by an external transmit clock
•
Automatic selection of even parity
•
Automatic formatting of communications in unique PLATO
network format:
Receive words of 21 bits (figure 1-6)
Transmit words of 13 bits (figure 1-7)
P
A
R
I
T
S
T
A
R
JlI I I I I I I I I I I I I I I I I I I I J 1-I. IY
19 DATA BITS
SPACE OR"
MARK OR 0*
~·-~-----------------IWORD:21 BITS------------------------~
ItNONCONVENTIONAL BIT POLARITY
Figure 1-6.
62940007 B
03336-4
Receive Word Format in PLATO Network
1~13
p
S
T
A
R
A
R S
J T
T 0
T
y
J_.(----(-...-,-""-r
~ \..
to OATA
"'~t-------I
I r~ ~ :::: O:~:
r.----r-I--r-r-r-(-r-(.....---"
-r---"'1[
BITS
-t
P
E.
I
WORD: 13 BITS - - - - -...+--NEXT03336-4
·CONVENTIONAL BIT POLARITY
Figure 1-7.
Transmit Word Format in PLATO Network
PARALLEL
The PARALLEL connector provides the capability of connecting up
to eight peripheral devices to the terminal in daisy-chain
fashion. Characteristics include:
•
Parallel 8-bit data transfers that are initiated by the
terminal
•
Maximum cable length in daisy chain (including internal
cabling) of 7.6 m (25 ft)*
•
TTL (transistor-transistor logic) compatible signal
levels, defined as follows:
Terminal output
Data Lines
Others
+2.0 V < High < +5.25 V
+0.0 V Z Low Z +0.5 V
+2.4 < High < +5.25 V
+0.0 Z Low Z +0.4 V
Terminal input
Data Lines
+2.0 V
-0.25 V
Others
< High < +5.25 V
Z
Low
~
+0.8 V
+2.4 V < High < +5.25 V
+0.25 V Z Low < +0.8 V
Table 1-3 gives the pin assignments.
*Last device in daisy chain must have terminator (part number
15632316).
1-14
62940007 B
TABLE 1-3.
PARALLEL CONNECTOR PIN ASSIGNMENTS
I----------r-----------r
PIN NUMBER
I
I
r
I
I
I
I
I
I
I
I
I
I
I
SIGNAL
I
I
I IN/OUT
I
I
-------1-------------
ACTIVE LEVEL
Data Line 0
High
Both
Data Line 1
High
Both
Data Line 2
High
Both
Data Line 3
High
Both
Data Line 4
High
Both
Data Line 5
High
Both
RJ2-23
Data Line 6
High
Both
RJ2-24
Data Line 7
High
Both
RJ2-2
Address Line 0
High
Out
RJ2-3
Address Line 1
High
Out
RJ2-4
Address Line 2
High
Out
RJ2-5
Address Line 3
High
Out
RJ2-6
Address Line 4
High
Out
RJ2-7
Address Line 5
High
RJ2-15
RJ2-16
RJ2-17
RJ2-18
RJ2-21
RJ2-22
RJ2-8
External Write
Low
RJ2-9
External Output
Low
I
I
External Ready
I
I
Interrupt
I
"_._----I
Low
RJ2-10
RJ2-11
RJ2-12
Note:
62940007
~
I
I
I
I
I
External Read
High
Low
Out
I
I
I
I
I
I
I
I
I
I
I
Out
Out
Out
In
In
Pins RJ2-1, -14, -19, -20, and -25 are grounded.
Pin RJ2-13 is open.
1-15
EQUIPMENT SPECIFICATIONS
The following paragraphs describe the physical, electrical, and
environmental specifications for the terminal.
PHYSICAL SPECIFICATIONS
The terminal has the following dimensions and weights:
Width:
Height:
Depth:
Weight:
400 mm (15.75 in)
419 mm (16.5 in)
603 mm (23.75 in)
18.2 kg, (40 Ib) 60 Hz
21.8 kg, (48 lb) 50 Hz
ELECTRICAL SPECIFICATIONS
The electrical power requirements for the domestic terminal, are
listed below. The electrical power requirements for the international unit, are listed within parentheses in the cases where
they differ from the domestic unit.
Voltage: 120 V ac (220 to 240 Vac)
Phase: Single
Frequency: 60 Hz (50 Hz)
Current: 1.4 A (0.7 A)
Power Consumption:
0.154 kVA
ENVIRONMENTAL SPECIFICATIONS
The environmental requirements of the terminal are:
Operating Temperature: 10°C to 35°C (50°F to 95°F)
Storage Temperature: -40°C to 70°C (-40°F to 158°F)
Maximum Temperature Gradient: 10oC/h (18°F/h)
Operating Relative Humidity:
Storage Relative Humidity:
Humidity Gradient:
10% to 90% (no condensation)
0% to 100% (no condensation)
10%/h
Maximum Operating Altitude: 3000 m (9850 ft)
Heat Dissipation:
440 Btu/h (129 W)
Cooling: natural convection
1-16
62940007 B
I/O CABLE, GROUNDING, AND TOOL REQUIREMENTS
The following paragraphs describe the I/O cables, grounding, and
tools that are required by the terminal.
I/O CABLES
Table 1-4 supplies a detailed breakdown of the I/O cables used
with the terminal.
GROUNDING
No special grounding requirements are necessary for the terminal. A safety ground is provided through the three-prong ac
power plug when connected to a properly grounded site outlet.
TOOLS
Metric hand tools (wrenches, sockets, etc.) are required in the
support of the terminal.
TABLE 1-4.
TERMINAL I/O CABLES
I
I
CABLE
CONNECTS BETWEEN
I MAX PERMIS- I
~~~~~~--~~--~~~~~~~~~~~~~~----PART NO.
LENGTH
I/O CONNECTOR
EQUIPMENT
SIBLE LENGTH I
I
I
I
NOTES
51917907
4.3 m
(14 ft)
LINE
Telephone wall
jack
N/A
51917911
4.3 m
(14 ft)
LINE
Telephone wall
box containing
dedicated telephone line or
CN701-A Acoustic
Coupler
N/A
Supplied with
internal modem.
61406110
3.2 m
(10.5 ft)
ASCII/PLATO
COMM
External modem
15 m
(50 ft)
Supplied with international terminal, optional
with domestic
terminal (option
799-11/YA254-A)
62940007 B
Supplied with
internjil modem.
1-17
TABLE 1-4.
TERMINAL I/O CABLES (CONTD)
1
CABLE
CONNECTS BETWEEN
'MAX PERMIS- 1
-P-A-RT---NO~.~I~-LE~N~G~T~H~~~I~/~O~C~ONNE~~C~T~O~R~I--~E~QU~I~P~M~E~NT~----'SIBLE LENGTH'
,
,
, N/A
1
1
N/A
,
,
ASCII/PLATO
COMM
Long-line inter-, 3000 m*
face of PLATO
1 (10 000 ft)1 site controller
site controller 1
1 or multiplexer.
or a terminal
I
1
multiplexer
1
1
PARALLEL
Peripheral
device
SERIAL
Undefined
serialcommunication
device
VIDEO OUT
Undefinedvideo hardcopy
unit. or special
high-resolution
monitor
1
1
1
61408865
I
1.5 m
, (5 ft)
I
I
I
I
,
I
I
I
, N/A
N/A
I
,
,,,
I
N/A
I
I
I N/A
,
I
I
I
,
NOTES
I
I
I Supplied with
I
I
I
I
I
I
,
I
I
I
I
I
I
7.6 m**
(25 ft)
I
I
,
,
I
I
I
Same or shorter
cable supplied
with peripheral
device. Last
device in daisy
chain must have
terminator (part
no. 15632316).
15 m
(50 ft)
25-pin connector, part no.
10129658, with
contact pins,
part no. 620138011
or 62013802, mate 1
with SERIAL
1
connector.
1
150 m***
(500 ft)
75-ohm coaxial
cable is
recommended.
1
1
I
1
1
1
I
I
I
1
*For data rates not e~eeding 1200 bps.
**Maximum length in daisy chain, including internal cabling.
***Maximum length is dependent on cable characteristics, signal termination, and
1
receiver design.
_________________________________________________________________________ 1
1-18
62940007 B
OPERATION
2
This section describes the function of the external and internal
controls and indicators of the terminal.
For terminal operating
procedures, refer to the user's guide that covers the effective
application (a list of publication numbers appear in the
preface) •
EXTERNAL CONTROLS AND INDICATORS
The following paragraphs describe the function of the external
controls and indicators (figure 2-1). The external controls
include the keyboard, ON/OFF circuit breaker, BRIGHTNESS
control, TALK/DATA switch, RESET switch, and the selection
switches behind the protective door. The external indicators
consist of six light-emitting diodes (LEDs).
SELECTION SWITCHES
PROTECTIVE DOOR
(SHOWN OPEN)
TALK/DATA SWITCH
.:..:....:....:..:....--"-----:--:--LEDS (6)
03'14
Figure 2-1.
62940007
External Controls and Indicators
2-1
KEYBOARD
The effect of the codes generated from the keyboard varies with
the application. The code that each key generates is described
in Theory of Operation, section 4.
ON/OFF CIRCUIT BREAKER
Pressing the circuit breaker to ON does the following:
•
Applies power to the terminal and sets logic circuits to
an initial state
•
If enabled by selection switches behind protective door,
initiates the resident diagnostics (diagnostics are
normally disabled except during maintenance)
•
Generates a loading of controlware from the selected
source
The crt filament requires approximately 45 seconds to warm up.
BRIGHTNESS CONTROL
This control adjusts video brightness.
TALK/DATA SWITCH
This slide switch has two functions:
•
2-2
When the optional internal modem is installed, placing
the switch in the TALK position disconnects the terminal
from the PLATO network and internally connects the
telephone line to the telephone plugged into the PHONE
jack, thus allowing voice use of the telephone. This
also occurs automatically when the terminal is powered
off. Returning the switch to the DATA position
reconnects the telephone line to the internal modem for
PLATO network communications.
62940007
If the telephone plugged into the PHONE jack is arranged
with an external modem for alternate operations in an
ASCII network (such arrangements are shown in Installation, section 3), the switch must be left in the TALK
position throughout those operations.
This keeps the
internal modem disconnected and allows the telephone line
and external modem to be connected through the terminal.
•
In European applications requiring a switched Data Terminal Ready signal, the TALK/DATA switch serves as an
exclusion switch for the external communications equipment (no international units have internal modems).
Under these circumstances, internal switch S2-1
(described later in this section) must be set for a
switched Data Terminal Ready signal. This causes the
resident loader program to only issue Data Terminal Ready
when the TALK/DATA switch is set to DATA. After controlware is loaded, this function is governed by the
controlware.
RESET SWITCH
Pressing the RESET switch does the following:
•
Resets most logic circuits
•
Lights all six LEDs on operator panel
•
If no controlware is loaded, initiates the resident diagnostics, if enabled, and generates a loading of controlware from the selected source
•
If controlware is loaded and operations are with the
PLATO network, the result varies with the length of the
reset:
Pressing the switch momentarily causes a checksum to
be performed on each major block of loaded controlware.
Any blocks in error are automatically reloaded,
and if three blocks are in error, a full reloading
occurs.
Pressing the switch for 3 seconds or longer initiates
a load the same as if no controlware were loaded.
62940007
2-3
•
If controlware is loaded and operations are with the Data
Services network, the result varies with the length of
the reset and the mode of operation:
In timeshare or graphics mode, the results of a
momentary or 3-second or longer pressing of the switch
corresponds to that described for PLATO network operations.
The only difference being that any controlware
block found in error after a momentary pressing causes
a full (rather than partial) reload.
In PLATO mode, pressing the switch for 3 seconds or
longer causes the terminal to log off PLATO, perform a
checksum on controlware, and if any block is in error,
do a full reload.
Regardless of whether a reload
occurs or not, the terminal subsequentially enters
timesharing mode.
With a momentary pressing of the switch in PLATO mode,
a checksum is performed, and if all controlware blocks
are good, operation continues in PLATO mode. Otherwise, a block in error causes the terminal to log off
PLATO, do a full reload, and then enter timeshare mode.
SELECTION SWITCHES BEHIND PROTECTIVE DOOR
The setting of these switches (figure 2-2) effects controlware
loading, communication characteristics when in timeshare or
graphics mode, and the running of the resident diagnostics. A
selection is made by pressing the side of the switch as shown on
the decal on the back of the door.
Instructions for setting
. these switches are given in Checkout, section 3. Tables 2-1 and
2-2 collectively define their functions.
CAUTION
Do not use a "lead" pencil to set
rocker switches.
Graphite dust from
the pencil can cause a switch
malfunction.
2-4
62940007 B
SWITCH DECAL
NETWORK~
PARITY
~DU~
~
L
J
C;~'j; CD ~~;N
=
=
HALF CD FUll
=
=
=
CD
=
=
LOUD
=
=
=
SKIP
o:::J SOFT
CD KB
& TP
~
:~~B5~T~S:AL
INTo::JEXT
NORMo::::J SEL
LOAD SOURCE
ROCKER
SWITCHES
OOOR
ouo.
Figure 2-2.
Selection Switches Behind Protective Door
TABLE 2-1.
FUNCTION OF SWITCHES BEHIND DOOR
I
I
FUNCTION
I
r-
I
NOTES
I
I
T
IThis switch is only
IIf timeshare
leffective in timeshare
lor graphics
lor graphics mode.
Imode is run
ISetting switch to YES
lonline with
lenables parity in comIData Services
Imunications during thoselnetwork,
Imodes; setting switch tolswitch must
NO disables parity.
Ibe set to YES.
I
NETWORK PARITY ODD/
EVEN (9)
For this switch to be
IIf timeshare
effective, PARITY NO/YESlor graphics
switch must be set to
mode is run
YES.
Then this switch
online with
setting determines
Data Services
whether terminal uses
network,
ODD or EVEN parity in
switch must
communications during
be set to
timeshare or graphics
EVEN.
mode.
I
I
NETWORK HALF/FULL (8)
62940007 B
This switch setting is
only effective in timeshare or graphics mode.
IWith switch in HALF
\position, keyboard data
lis displayed simultanelously as it is transImitted.
In FULL
\position, keyboard data
If timeshare
I
or graphics
I
mode is run
I
online with
I
Data Services I
network,
I
switch must bel
set to HALF
I
position.
I
2-5
TABLE 2-1.
I
I
FUNCTION OF SWITCHES BEHIND DOOR (CONTD)
SWITCH
I
I
I
I
FUNCTION
I
I
NOTES
I
I---------------------~I-------------------~I,----
I
I
lis not displayed until
lit returns from host
computer.
I
I
I
I
I
I
I
'I
' I
t
ILOUD/SOFT (6)
,
I
I
I
I
Determines whether ter- (Conditions
mina1 sounds a LOUD
Ithat cause
or SOFT alarm.
la1arm to
Isound varies
Iwith app1iI cation.
I
I
I
I
I
I
I
I
I
I
For this switch to be
IResident
effective, SKIP/TEST
Idiagnostics
(4) switch must be set
lare described
to TEST. Setting of
lin MainteIthis switch then deter- Inance, secImines whether crt a1ign- tion 6.
Iment, keyboard, and
Itouchpane1 tests (KB&TP)
lare included in running
Idiagnostics or are
Ibypassed (SKIP).
I
ISKIP/TEST (4)
I
I
I
I
I
I
I
(
LOAD SOURCE HOST/LOCAL
(3 ) ,
LOAD SOURCE INT/EXT (2),
LOAD SOURCE NORM/SEL (1)
2-6
II
' I
t
,Not used (7)
\SKIP/KB&TP (5)
I
I
\
I
I
Resident
diagnostics
are described
in Maintenance, section 6.
I
I
I
I
I
I
\
I
I
I
I
I
I
I
\
I
I
I
I
IWhen resident diagnosItics are to be run
Iduring maintenance,
Ithis switch is set to
ITEST.
Resident diagInostics then autoImatica1ly run after a
Ipower on or when RESET
Iswitch is pressed (if
Icontro1ware is loaded,
IRESET may have to be
Ipressed twice, each
Itime for 3 seconds or
11onger).
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
IThese switches,
I Instructions
I
I together with the
I for loading is I
Iswitches listed in
Icontained in
I
Itable 2-2, determine
Istartup proce-I
Ithe source and contro1- Idure in termi-I
Iware file that is
Ina1 operator'sl
laccessed during loading.lguide (refer
I
ITab1e 2-2 defines the
Ito preface fori
I selections.
Ipublication
I
I
Inumber).
I
62940007
TABLE 2-2.
LOAD SWITCH SELECTIONS
-------- --- ---- -
I~ -LOADsouRcE~----l --- < ------- < 1INTERNAL SWITCH -SETTINGS** 1~ ---~---I SWITCH SETTINGS I CONNECTED I ---
I
<
DISPLAY MONITOR
r--.
I
03333-2
Terminal Block Diagram
4-1
CONTROLLER BOARD
This board contains a Z80A microprocessor that controls the
operation of the terminal by executing program instructions.
Upon a power on or reset, these instructions are provided by the
resident diagnostic/loader program. This continues until controlware is successfully loaded, or if a reset occurred with
controlware already loaded, until all necessary reloading is
completed. The diagnostic/loader program then relinquishes
control and the microprocessor executes the controlware
instructions.
The other circuits on the controller board support the microprocessor by handling communications, accumulating status information, monitoring interrupt conditions, and interfacing the
microprocessor with other modules. Through input/output
exchanges with these circuits, the microprocessor controls:
•
Read/write transfers with memory on video board
•
Communications with the connected network, attached
peripherals, and a serial-communication device that may
be attached
•
Keyboard and touchpanel entries
•
Lighting of LEDs on operator panel*
•
Input of external and internal switch settings
•
Input of the factory-set identification code of the
terminal
The circuits on the board that handle network communications are
divided in two groups, the PLATO communication circuits and the
ASCII communication circuits. The group of communication
circuits and interface used in network communications are
established by program instructions. For example, when controlware is to be loaded from a host network, the diagnostic/loader
program determines which interface and communication circuits
are applicable by scanning each interface that may be connected
to the network. An active Carrier Detect signal on the internal
modem interface or external modem interface, or receipt of PLATO
network NOP codes (2l-bit blank words with only a start bit) on
the long-line interface stops the scanning and selects that
interface. In the case this is either the internal
*During resident diagnostics, the microprocessor controls all
LEDs on operator panel. During other operations, it controls
only the DTR and ERR LEOs, and the other four LEOs are driven by
terminal/modem interchange.
4-2
62940007 B
modem or external modem interface, the program determines the
applicable communication circuits by distinguishing if the idle
codes received through the interface are PLATO network NOP codes
or ASCII CR, LF, or slash 0-/ I -
I
DATA (INPUT)
----------~I----------~(~~:
__~}~------------
1~.----750----~~~-~
SAMPLE EXT READY
--------~:--------~"
I
-j
j.->O
\_----------
EXTERNAL READY
NOTE: ALL TIMES I N NANOSECONDS.
03340
Figure 4-9.
External Input/Output Timing (NO Extra Wait States)
Two-hundred-fifty nanoseconds after issuing External Write, the
interface circuits drop the External Output signal active low.
The data is stable at this time, and the addressed device uses
the External Output signal to latch the data.
From the beginning of output 2Y/3Y16' the interface circuits
force the microprocessor to enter a series of wait states, each
250 nanoseconds long. This continues at least 750 nanoseconds
after the issue of External Write. At this time, the interface
circuits start sampling the External Ready line to determine
which of the following cases is applicable:
•
4-28
No extra wait states (figure 4-9) - If the device has
raised External Ready 750 nanoseconds after External
Write, the interface circuits release the microprocessor
so it can continue instruction execution.
62940007
•
Extra wait states (figure 4-10) - If the device has not
raised External Ready 750 nanoseconds after External
Write, the wait states continue until External Ready is
raised or the following timeout occurs.
•
Timeout (figure 4-11) - If the device has not raised
External Ready within 54 microseconds (+20%) after External Write, the interface circuits simulate receipt of
External Ready, release the microprocessor, and set the
I/O timeout status/interrupt to inform the microprocessor
that the exchange was not completed.
-1
250
r
CLOCK (4 MHz)
REFERENCE ONLY
ADDRESS
DATA (OUTPUT)
EXTERNAL WRITE
EXTERNAL OUTPUT
------..... -
-- - - - - -
-~--
OUTPUT
-I
EXTERNAL READ
INPUT
-- -- ----
-----"
250
t-
DATA (INPUT)
1
1---
SAMPLE EXT READY
750 - -.....--:..1_ - - - I 1--_-.1_1+"-_>_0_-.,
I
-+I
14->0
-----.~n7~M77Tr.M~
EXTERNAL READY
NOTE: ALL TIMES IN NANOSECONDS UNLESS STATED OTHERWISE.
Figure 4-10.
62940007
03341
External Input/Output Timing with Delayed
Device Ready (Extra Wait States)
4-29
CLOCK (4 MHz)
REFERENCE ONLY
AOORESS
DATA (OUTPUT)
EXTERNAL WRITE
EXTERNAL OUTPUT
---------. -
- - --
- - -
- - - - - -.----
OUTPUT
-I
EXTERNAL READ
INPUT
- - - - -
-----i
250
I-
DATA (INPUT)
I
I
SAMPLE EXT READY
~~~---750----~-~1
I
~--~
\.->0
I
14->0---../
~--
EXTERNAL READY
TIMEOUT STATUS
~14~-----54~S±20% ---------~~~
03341-1
NOTE: ALL TIMES IN NANOSECONDS UNLESS STATED OTHERWISE.
Figure 4-11.
External Input/Output Timing with Device
Not Ready (Timeout)
Input Exchange
An input 2Y/3Y16 places the address code from the microprocessor on the Address Lines and turns the data receivers on.
Fifty
nanoseconds later, the interface circuits drop the External Read
signal active low. The devices then start sampling the address
code, and the addressed device subsequentia1ly turns its data
drivers on and conditions the External Ready line.
4-30
62940007
As with an output, the microprocessor is forced into wait states
from the beginning of the operation until the receipt of External Ready (no extra-wait state or extra-wait state cases) or
until timeout occurs.
VIDEO BOARD
The video board contains the memory and display refresh circuits
of the terminal and provides the 4-MHz clock that drives the
microprocessor on the controller board. The following paragraphs describe the memory structure on the video board and the
display refresh it performs.
MEMORY STRUCTURE
Figure 4-12 shows the memory structure and address assignments.
The board contains ROM and RAM that serve as program memory and
RAM that serves as display-refresh memory.
DISPLAY
REFRESH
MEMORY
r-·---,
OPTIONAL I
I
I
L
RAM
7
I
--...I
------,
3FFF I6 - - - - - - ·
.. ,.---'---""""'
RAM
1000
16-------.'---...,.--....
-
I
I
I
I
I
I
PROGRAM
MEMORY
~
OFFFI6--·
0000
16- - .
It CONTAINS
~
L::J----
RESIDENT DIAGNOSTIC/LOADER PROGRAM
lIltEXPANDABLE IN 4K INCREMENTS TO A TOTAL
OF 16K FOR ADDITIONAL RESIDENT PROGRAMS
Figure 4-12.
62940007
03357-3
Memory Structure and Address Assignments
4-31
Program Memory
The basic program memory consists of 4096 8-bit words of ROM
that holds the resident diagnostic/loader program and 16 384
8-bit words of RAM for controlware storage. Through options, up
to 16 384 words of ROM containing additional resident programs
can be added, in 4096 word increments, and 16 384 words more RAM
added. The overlap of ROM and RAM addresses is handled through
the selection scheme described earlier under microprocessor
instruction fetching.
The program RAM requires that the microprocessor perform 128
refresh cycles every two milliseconds to keep the storage cells
of those chips active.
These 32 768 8-bit words of RAM store the information that is to
be displayed.
Each bit stored corresponds to a specific dot
position on the screen. Both the microprocessor and display
refresh circuits share access to this memory, with the display
refresh circuits having priority. No refresh cycles by the
microprocessor are necessary with this RAM because of the
sequential reads done by the display refresh circuits.
DISPLAY REFRESH
The following paragraphs describe the refresh-memory/display
relationship and display-refresh timing.
Refresh-Memory/Display Relationship
There is a direct relationship between the address of the
refresh memory where data is written and the coordinate where
the data is displayed.
The relationship is:
•
4~32
Each refresh-memory address defines a memory location
where eight bits (dots) of information are stored.
These
eight bits represent eight contiguous dots positioned on
a scan line, with data bit 0 (least significant) on the
left and data bit 7 (most significant) on the right
(figure 4-13). Sixty-four of these dot groups or columns
exist across the displayable area of the screen (columns 0
through 63).
62940007 B
COLUMN I
COLUMN 0
COLUMN 2
\,--- - - I- ,A., I I ," I , f ," 2 2 2 2\~
234567890'234567890'234
"
0
o ,
I
I
2
I
3
SCAN
LINE
145
6
I
7
8
1~1
I I Itllll~
DATABIT 7
MEMORY ADDRESS BOOB"
DATA BITO
64COLUMNS
-I---~
----,,
I
AREA WHERE DATA
'S DISPLAYED
,,
I
:
I
I
512 SCAN LINES
L_______________ J
04030
Figure 4-13.
Refresh-Memory/Display Relationship
•
The upper seven bits of the l6-bit refresh-memory address
define one of the 64 columns. The lower nine bits of the
address define one of the 512 scan lines that are within
a column (lines 0 through 511).
Increasing the upper
7-bit segment by one refers to the next column to the
right; and increasing the lower-bit segment by one refers
to the next lower line in a column.
•
The lowest refresh-memory address (800016) corresponds to
the upper-left corner of the displayable area (column 0,
line 0); and the highest address (FFFFl6) corresponds to
the lower-right corner (column 63, line 511).
62940007 B
4-33
As each refresh-memory address relates to an 8-dot horizontal
area on the screen, illumination of dots depend on the stored
bit values. A logical 1 in memory results in the corresponding
dot being illuminated, and a logical 0 results in it being black.
Display-Refresh Timing
The display refresh circuits generate a noncomposite video signal with separate line sync and field sync signals for the display monitor and a composite video signal that is output on the
rear-panel VIDEO OUT connector. Both sets of signals have the
following timing:
•
A 34.23-KHz scanning rate making scan line timing as
shown in figure 4-14.
Scanning goes left to right across
the screen, then retraces left and down to the next line.
•
A 50- or 60-Hz frame-sync rate making frame timing as
shown in figure 4-15. The 50- and 60-Hz rates are
generated by internal clocks and are selected via the
50/60-HZ switch on the power supply.
::::~~_~- ------_-_-_-.. I'--_______
V_I_D_EO
_ _ _ _ _ _ _--L_---.
SYNC----~
::~NE
]:""+IOI+
t SL = SYNC WIDTH
L
+1 02:1
= 2.998 uSEC
tOl = SYNC/VIDEO DELAY= 2.998 uSEC
t vL = VIDEO FIELD
=21.248uSEC
t D2 = VIDEO/SYNC DELAY= 1.972 uSEe
=29.216 uSEC (34.23 KHZ)
03358
Figure 4-14.
4-34
Scan Line Timing (Composite Video Signal)
62940007
LlNE511J
LINE 512
Y
'(:~
~L1NE2
LINE I
60HZ
(LINES)
(mSEC)
t
t
t
VIDEO WIDTH
03 VIDEO/SYNC DELAY
SF FRAME SYNC
04 SYNC/VIDEO DELAY
FRAME TIME
50 HZ
(LINES)
(m SEC)
25
14.959
0.555
0.117
0.730
512
73
4
96
14.959
2.133
0.117
2.805
570
16.653
685
512
19
4
20.013
03358
Figure 4-15.
Frame Timing (Composite Video Signal)
The internal modem/DAA (data-access arrangement) board is only
applicable for PLATO network communications and is selected for
operation through microprocessor output 0516.
The board uses
the phase-coherent frequency-shift keying (FSK) type of
modulation/demodulation and operates asynchronously, full-duplex
on a two-wire telephone line. Major modulation/demodulation
characteristics are:
•
The analog transmitter operates from 0 to 150 bps and
generates a 390-Hz signal for a mark (logical 1) and a
490-Hz si~nal for a space (logical 0). Transmitter power
is -9 dBm (maximum) to -13 dBm (minimum).
•
The analog receiver operates from 0 to 1200 bps and
recognizes an incoming signal of 1300 Hz as a mark and
2100 Hz as a space. The power of incoming signals can
range from -10 dBm (maximum) to -43 dBm (minimum).
Carrier detect occurs for signals between 1100 and 2300 Hz.
Connection of the analog receiver/transmitter with the telephone
line is made through a relay on the board that is controlled by
the front-panel TALK/DATA switch.
Use of the TALK/DATA switch
is described in Operation, section 2.
62940007
4-35
OPERATOR PANEL
The operator panel consists of a printed-circuit board that is
mounted behind the bezel/keyboard cover. Attached to the board
are: the audible alarm, RESET switch, TALK/DATA switch, six
LEDs, and the ten selection switches that are behind the protective door.
Program access to the setting of switches on the
board occurs via microprocessor inputs 0016 and 0616. Output 0016 controls the LEDs when they are under microprocessor
control, and output 0516 controls the alarm.
TOUCHPANEL
The touchpanel consists of a mylar panel with sixteen Y signal
lines in horizontal rows overlaying a glass panel with sixteen X
signal lines in vertical columns. These X/Y signal lines connect to the touchpanel-interface circuits on the controller
board. When the outer mylar surface is pressed against the
glass, the intersecting row and column signal lines effectively
short together and the interface circuits capture the X/Y coordinates for transfer to the microprocessor.
The touchpanel-interface logic operates basically as follows.
The upper 4 outputs of an initially free-running 8-bit counter
are fed into a 1-of-16 decoder, which sequentially drives each
column (X) signal line to a logical low while leaving the others
high.
During the excitation of each column signal line, the
lower 4 outputs of the counter are used, via a 16-input multiplexer, to sequentially select each row {Y} signal line for sampling. Upon detecting a logical low row signal line, the logic:
•
Delays (debounces) the signal
•
Stops the counter
•
Sets the touchpanel data-ready status/interrupt
•
Passes the current counter outputs (X/Y coordinates) to
the microprocessor upon an input 0216
•
Enables the counter to continue scanning after the input
0216 by the microprocessor
4-36
62940007 B
KEYBOARD
Except for the SHIFT and CTRL (Control) keys, each keyboard key
enables a shifted code (SHIFT key in use) and an unshifted code
(figure 4-16).
Either type code is increased by 8016 when the
CTRL key is in use. None of the actual keycodes are generated
by the keyboard itself. Rather, the basic codes are generated
by the keyboard interface circuits on the controller board and
are modified by the controlling program.
A counter in the keyboard-interface circuits outputs counts that
are equal to the unshifted codes assigned to keys. The keyboard
decodes this output and indicates the state of the corresponding
key via a Strobe signal.
If the key corresponding to the
current count is being pressed, an active low Strobe signal
causes the keyboard interface circuits to:
•
Delay (debounce) the signal
•
Stop the counter
•
Set the keyboard data-ready status/interrupt
•
Pass the current counter output and state of SHIFT and
CTRL keys to the microprocessor upon an input 0116
•
Enable the counter to continue counting after the input
0116 by the microprocessor
SHIFTED_
20
21
22
23
24
25
26
27
28
29
78
30
31
32
38
01
71
02
77
03
65
04
72
05
74
06
79
07
75
08
69
09
6F
58
70
10
33
\I
34
12
35
18
3C
51
57
45
52
54
59
55
49
4F
50
13
14
15
IC
m[I]mmwrn[JCJmmm~~fI~
CODE
UN~~6~ED_00
3F
2C
2E
~~mmmmwwwQQwl~~).~~~
IF
OC
OE
~aimQmQ~QQQQ:
28
00
2A
08
OA
OF
41
53
44
46
47
48
4A
7A
78
63
76
62
6E
5A
58
43
56
42
4E
48
4C
5C
16
~~m
60
7F
7E
70
17
18
39
10
3A
40
5F
5E
50
19
IA
~1IJ~~}mmmwwQwDCJm~~l~~
60
I~
40
II
02298-1
NOTE: SHADED AREAS INDICATE DIFFERENCE IN KEYCAP COLORS.
Figure 4-16.
62940007 B
Keyboard Codes and Legends
4-37
DISPLAY MONITOR
The monitor is a noncomposite display that is driven by standard
TTL/DTL logic-level inputs. The display inputs are line sync,
field sync, and video information, which are provided by the
video board.
DC power for the display is provided by the power
supply board. The display consists of deflection electronics,
high voltage circuits, video electronics, cathode-ray tube (crt)
and necessary mechanical support components. Adjustments are
provided for size, centering, focus, brightness, and linearity.
All adjustments except brightness are factory set, but may be
adjusted by maintenance personnel.
POWER SUPPLY BOARD
The power supply board converts l20-V ac, 50/60-Hz input power
to regulated outputs of +5, -5, +12, -12, and +55 V. On international units, a stepdown transformer is associated with the
power supply board to reduce the 220 to 240 V ac to the required
120 V ac level. The +5, -5, +12, and -12 V power the terminal
logic circuits, and the +55 V powers the deflection and highvoltage circuits of the display monitor.
The circuits of the power supply board are divided in two sections, the section that develops +55 V and the section that
develops +5, -5, +12, and -12 V.
Each section contains separate
transformers and separate rectifier, filter, and regulator
circuits. The section for +5 V contains an additional
overvoltage-protection circuit. The circuit automatically shuts
off all outputs of that section when the +5-V output rises to
+5.5 to +6.8 V.
The +5-Vand +55-V outputs are adjustable.
4-38
62940007 B
DIAGRAMS
5
This section contains the logic diagram set for the terminal.
Instructions on how to interpret the logic diagrams are contained in the preliminary sheets of the diagram set.
62940007 B
5-1
SHEET
NO
CROSS
REfERENCE
NUMBER
MODULE
LOCAT I ON
LOG I COl AGRAM TillE
REV
........
Ww
C/)w
I
G
LOGIC DIAGRAM SET CONTENTS SHEET
:iJ:
1
G
LOGIC DIAGRAM CONTROL SHEET 1
ffi~
::!Z
3
A
KEY TO DIAGRAMS - PHYSICAL LOCATION CODES
4
G
KEY TO DIAGRAMS - PHYSICAL LOCATION CODES
5
A
KEY TO SYMBOLS
6
000
G
CABLI HG ANO I HTERCOHNECT I ON 0 I AGRAM
7
001
C>
SCHEMATIC DIAGRAM. 9CAS (ASCII 1ST POIER SUPPLY)
B
~Ol
F
SCHEMAT I COl AGRAM. BCAO POIER SUPPL Y
9
001
A
SCHEMAT I COl AGRAM. BCAO POIER SUPPLY
A
10
003
A
VIDEO CONTROL LER (OABD) EXTERNAL CONNECTI ONS
II
004
A
SCHEMATiC. DISPLAy' LDCIC CABLE
11
005
C
DISPLAY SCHEMATIC
13
006
A
CONTROLLER MODULE (OACO) EXTERNAl CONNECTI ONS
14
A
VIDEO CONTROLLER (OABO) BLOCK DIAGRAM
15
A
CONTROLLER MODULE (OACD) BLOCK DIAGRAM
etC/)
Ow
U ....
_z
(!)O
gu
N
16
100
G.
SCHEMATIC DIAGRAM. OABD OSCILLATOR. CPU INTERFACE
17
101
A
SCHEMATIC OIAGRAI. OASO DOT TIMING CHAIN
IB
102
A
SCHEMATIC DIAGRAM. OASD HORIZONTAl TIliNG
19
103
A
SCHEMATIC DIAGRAM. OAlO VERTICAL TIMING. IEMORY IINOOI TIMING
20
104
C.
SCHEMATI COl AGRAM. OABO IEIORY IINDOI TIMING
21
IDS
A
SCHEMATIC DIAGRAM. OABO VIDEO SH I FT RGTRs/IUX. DISPLAY DRIVE LOGIC'
22
106
G
SCHEMATIC DIAGRAM. OASO SULK IRITEI£RASE. VIDEO DISABLE
23
101
G
SCHEMA TI COl ACRAM. OASO PROCESSOR MEIORY TIMING
g
j
=
~
~
24
I DB
A
SCHEMATIC DIAGRAM. OABD DISPLAY ADDRESS REGISTER.
MEMORY TIMING
25
109
A
SCHEMATIC DIAGRAM. OASO DISPLAY MEIORY ADDRESS MUX
26
liD
D
SCHEMATIC DIAGRAM. OABO DISPLAY MEMORY
21
III
D
SCHEMATIC DIAGRAM. OASO PROCESSOR MEMORY
.
2B
112
E
SCHEMATIC DIAGRAM. OASO DATA SUS TRANSCEIVER. COMPOSITE VIDEO.
MEMORY OUTPUT SUFFERS
~
29
113
A
SCHEMA~IAGRAM.
'"
3D
114
G
VIDEO CONTROLLER MODULE OASD POIER. GROUND AND DECOUPLING
31
A
VIDEO DOT TIMING. CHARACTER TIMING AND MEMORY IINOOIS
31
E-
LINE TIMING FiElD (50160 HZ) TIMING
oI SPLAY
:
!
~
,
~
co
=
~
~
~
OABD PROGRAM.ED EROM
~
z
co
~
33
C
!
r:i
DISPLAY MEMORY TIMING
34
200
G
SCHEMATIC DIAGRAM. OACD ZSD MICROPROCESSOR. RESET LOGIC
35
201
Go
SCHEMATIC DIAGRAM. OACD uP SIGNAL SUFFERS
~
~
~
0
z
Q
•
5-2
«
62940007 D
4
SHEET
NO.
CROSS
REFERENCE
NUMBER
IOOULE
LDCIlION
3
LOGIC IlIAGAIoM TITLE
REV
2
LOGIC DIAGRAM TITLE
~
I\.l
\.0
~
o
o
o
36
202
G
SCHEIATIC DIIAAII, OACO IIIPtJT lAX
37
203
G
SCHEIATIC DIAAAII, OAeo 110 CIIIITIHIt
3B
204
G
SCHEIATIC OIAAAII, OACO 110 CIIIITROL, OP PAII£L LED .Sf! & DtlIVER
39
205
(,
SCHEMATIC OIAGRAI, OACO FEITURE SElECT SIITCII£S, 1.0, COOE SIIUNTS,
40
20G
Go
SCHEIAI I COl ASHAM, OACD ~ElIDA.O SCANNER & CIIIITACT DETECT 1l1li LO" C,
I NTERRUPT IAS~ RSTR & ENCODER
41
207
Go
SCHEMATIC DIAGRAM, OACO PLATO XIT SHIFT REGISTERS, C_ CLOCU,
INTERVAL TIMERS
42
20B
Go
SCHEMATIC OIAGRAI, OACO PLATO COMMUNICATIONS CONTROL
43
209
Go
SCHEMATIC DIAGRAM, OACD LONG LINE RECEIVER,RS!3! DRIVERS & RECEIVERS
44
210
CO
SCHEMATIC DIAGRAM, DACO PLATO RECEIVER LOBIC
45
211
CO
SCHEMATIC DIAGRAM, OACD SERIAL BAUD RATE lUX, TOUCH PANEl CONTACT DETECT
46
211A
G
SCHEMATIC DIAGRAM, DACO COl. CLOCK RATE SElECT, KEYBOARD BUFFERS.
ASCIIIPLATO INTERFACE lUX
47
212
G.
SCHEIATIC OIAGRAI, OACO COIIUNICATION & SERiAl 110 INTERFACES
LONG LI NE OR IVER
4B
212A
G
SCHE~ATlC DIAGRAM,
49
213
G
SCHEMATIC OIAGRAI, OICO TOUCH PANEl LOGIC Y-SCANNER
50
214
G
CONTROLLER MODULE OACO POIER, GROUND & OECOUPLING
51
A.
PROCESSOR MEIORY CYCLES
52
A.
PLATO RECEIVER TiliNG
53
A
PLATO TRANSMITTER TIMING
-..J
o
c
B
A
DACD TOUCH PANEL LOGIC X-SCANNER
54
300
G
SCHEIAT I COl AGRAI, OAOO OPERATORS PANEl
55
4DO
D
KEYBOARD
5G
500
A.
LOGIC DIAGRAI, TOUCH PANEl (OPTIONAL)
57
GOO
Go
100EI OPTI ON, TRANSMITTER & Oil
58
601
(,
100El OPT I ON, RECE I VER
59
GO!
A
100EI OPTION; POIER, GROOItO & OECOUPlIHG
60
603
G
MOOEI II NE FIL TER
---------
Ln
I
w
•
CODE IDINI
LOGIC DIAGRA M
CONTROL SHEET 2
15920
o
en
LLI
en
8
:& (.)
::I:
0..('1.1
OABO
,
TYPICAL PIN
NUMBERING FOR IC
'0
2
3
4
5
&
7
B
Q
5-4
PHYS I CAL LOCAT! ON CODES
CIRCUIT MODULE LAYOUT. THESE DRAWINGS DEPICT THE
COMPONENT SIDE ASSEMBLY OF THE TID LOGIC MODULES
DIAGRAMMED IN THIS LOGIC SET. THE ALPHANUMERIC
CODES AT THE BOTTOM OF THE SYMBOLS ARE THE PHYSICAL
LOCATION CODES. THESE NUMBERS CORRESPONOE TO THOSE
SHOWN INSIDE THE LOGIC SYMBOL OUTLINES ON THE
DIAGRAM SHEETS.
15
14
13
'6
12
11
10
9
o
62940007
--
LOOPBACK
NORM
TEST
L----,L....J~---
0
N
0-
:!?
orr
C/)
LLI
11
C/)
go ~ "
~
______~
[SA
EIO
E88
~
C3
I-
RF---:-::----',
>LLI
x:
c:=J
12L--=E-=6A~----.J1 ~E:..:3-=A_-'1 rP,
1~
12,,---,E~6,,-8_-,I > E 3B
~ 0"'
9
~
0
0
...J
...J
""
~
C/)
>:J:
c..>
F7
o
""a::
0""
C)
C4
0
6========'1
H9
::IE
0
0
0
Z
0
IL.
AJI
~F3A10Q~
10 ~
FSB
gg g
BB
I
",0 .. ODm
~::B ~
.--=<>--'--------R.::.::J~'--------<>-=--,I r"1--=-o--R-J3---'" ~ @-c:30
RJI
OACO
TYPICAL PIN
NUI8ER ING FOR Ie
PltYSICAl LOCATION CODES
CIRCUIT 10DULE LAYOUT.. THESE DRAWINGS DEPICT THE
COIPONlllT SIDE ASSEl8LY OF THE TlO LOGIC MODULES
DIAGRAIIED IN THIS LOGIC SET. THE ALPHANUIERIC
CODES AT THE 8OTTOI OF THE SYMBOLS ARE THE PHYSICAl
LOCATI1IIt CODES. THESE NUMBERS CORRESPOND TO THOSE
SHOIN INSIOE THE LOGIC SYIBDL DUTLJNES ON THE
DIAGRAI SHEETS.
~Dj~
5
12
6
7
8
II
10
9
o
62940007 D
5-5
•
o
Q
GENERAL LOGIC SYMBOL INFORMATION
GENERAL P',C. BOARD INFORMATION
INTEGRATED CIRCUIT LOGIC SYMBOL
m140
B4A
EACH PRINTED CIRCUIT BOARD, UNDER IDEAL CONDITIONS, WOULD BE
REPRESENTED ON ONE SHEET
HOWEVER, DUE TO THE LARGE NUMBER Of
CIRCUITS LOCATED ON SOME BOARDS, MULTIPLE SHEETS MAY BE REOUIRED
THE BOARD TYPE IS LISTED AT THE BDnOM Of EACH DIAGRAM SHEET, THE
BOARD LOCATION WITHIN THE LOGIC CHASSIS MAY ALSO ACCOMPANY THE
BOARD TYPE
EACH SYMBOL ON THE DIAGRAM REPRESENTS A PORTION Of
AN INTEGRATED CIRCUIT. THE ENTIRE INTEGRATED CIRCUIT OR A DISCRETE
COMPONENT
EACH SYMBOL REFLECTS iHE LOGIC fUNCTION IDENTifiER,
ELEMENT OR COMPONENT TYPE, AND THE ELEMENT DR COMPONENT LOCATION
ON THE BOARD, COMPONENT LOCATION IS DEFINED BY AN ALPHANUMERIC
MATRIX DEPENDING ON THE TYPE Of PRINTED CIRCUIT BOARD USED
fOR
INFORMATION ON THE COMPONENT OR ELEMENT TYPES USED IN THIS LOGIC
SET, REFER TO KEY TO LOGIC SYMBOLOGY MANUAL, CDC PUBLICATION
NUMBER B11124DO
LOGIC FUNCTION IDENTIFIER
ELEMENT TYPE
PACKAGE LOCATION ON BOARD
(PHYSICAL LOCATION CODE)
_
_
TAGGING INFORMATION
POL'RITY INDICATOR
SIGNAL OEflNlflON
/ /
/
CD=nJ&
lLL
ODD
140
~
333 A3_3 9
~
3
-READ
/
))-1L
r
l
BOARD CONNECTOR
PIN NUMBER
QUALIFYING SYMBOLS
34B AB-B
:::MENT PIN NUMBER
&
I
I
X-Y = X(INPUTS) DECODED OR
ENCODED TO Y(OUTPUTS)
SIGNAL ORIGIN
SIGNAL DESTINATION
BOARD CONNECTOR PIN NUMBER
X/Y = X( INPUT LEVEl) CONVERTED
10 Y(OUTPUT LEVEl)
BOARD CONNECTOR PIN NUMBER
BOARD LOCATION IN LOGIC CHASSIS
BOARD LOCATION IN LOGIC CHASSIS
1.-_ _ _ _ CROSS REfERENCE SHEET NUMBER
CROSS REFERENCE SHEET NUMBER
ON BOARD, OFF SHEET TAGGING
N
= AND
= OR
= INVERTER
NON-STANDARD ABBREVIATIONS
IN A LOGIC DIAGRAM SET HAVING MORE THAN ONE SHEET. A HEXAGON IS USED TO INDICATE THAT THE SIGNAL
IS COMING fROM, DR GOING TO. ANOTHER SHEET OF THE SAME BOARD
(NOTE
EACH SIGNAL NAME IN THIS
LOGIC SET HAS BEEN PRECEDED BY A "+" (INDICATING AN ACTIVE HI) DR A "-" (INDICATING AN ACTIVE LO))
j
+READ
o
J
-WRiTE
CD DDS
~~:
004
CD
+REAO
J
004
004
C, R, SHT. 004
C, R, SHT. DDS
CD
+REAO
Q)
-WR ITE
:
C,R, SHT. DDB
ON SHEET TAGGING
VOLTAGE LEVELS
MISCELLANEOUS INDICATORS
ANALOG DR NON-lOGIC LEVElS
THE SMALL CIRCLES WITH ALPHA CHARACTERS INSIDE ARE USED TO
SHOW A SIGNAL PATH WITHOUT ACTUAlL Y RUNN I NG ALINE fROM ONE
POINT TO ANOTHER, A CIRCLE WITH AN ARROW POINTING AWAY fROM
IT IS THE SIGNAl ORGIN IN DIRECT LINE WITH THE ORIGIN ARROW.
ANOTHER CIRCLE IS DRAWN WITH AN ARROW POINTING TOWARD IT. THIS
IS THE SIGNAL DESTINATION
1,
NON-STANDARD LOGIC LEVEl
3,
LOGIC LEVElS
I NTfRVEN I NG
LOGIC
OTl LOGIC OPERATION
HIGH (LOGICAL 1) = +1,6 TO +~O VOLTS
LOW (lOGICAL D) = DO TO +0,4~ VOLTS
SWITCHING POINT = +1,1 TO +1.9 VOLTS
TTl LOGIC OPERATION
HIGH (lOGICAL I) = +1,B TO +~,O VOLTS
lOW (lOGICAL D) = O,OV TO +0,45 VOLTS
SWITCHING POINT = +,B5V TO +1 9 VOLTS
RESISTOR MODULES
SWITCH MODULES
~<>-
REfERENCE DESIGNATION NO
(ENTIRE MODULE)
frrrr-
fr
+5V
TEST POINTS
THE CLASS DESIGNATION LETTERS 'TP
HAVE
NOT BEEN SHOWN ON THIS LOGIC SET
THEREfORE. THE TEST POINTS APPEAR AS fOLLOWS
S1-1, B4
11'
REfERENCE DESIGNATION NO
(INDIVIDUAL RESISTOR)
VAIUE
lOCATION Of RES ISTOR
MODULE ON THE BOARD
'"U,,"' • '" ""
MODULE ON THE BOARD
SWI TCH POS I TI ON ON MODULE
REfERENCE DESIGNATION NO
(ENT I RE MODULE)
R4B.47K,AIO
T
u
5-6
62940007
4
3
2
8R1GHTNESS CONTROL
AC ENTRY PANEL
PI" 61408867
0'1
N
\0
AC ENTR'
CAlLE ASSE.BLY
51 HZ PIN 8140902
60 HZ PIN 8140896
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R31 5.90'
R43
402
R41
36.5.
R41 4.02'
R33 '9.31,
:::Ii~
CI I .01
WW
00::
o
R34 4.41k
:::Ii
+7,8 AT 2100Hl
+1308 AT 1300HZ
RSI,20 D.
LIMITER
RSl 10.0'
+5V
+11V
C14 .01
R47
Ik
5%
R&D
10.0'
R58 31.S'
CR7
CR&
R57.ll.4'
C15 .. 01
R59.10.0'
0.8 VAC
AT 1300 HZ
TP 2
LIM OUT
Jlf
+5Y
FSK DISCRIMINATOR
OV
R68,20.0'
11TH
CARRIER
R69.IO."
-IIV
R63.7.68'
Cl1 .. 01
R61
10.Ok
R65.21.1Ik
CR9
CR8
R81
R64.2.00k
C18. 01
R66.10.Ok
-=-
200 TO 510
5%
SELECTED
C31. .01
LUIPASS
C16,.01
R70
1~.
LUIPASS NOTC
Cll.. 01 LOWPASS NOTCH
R78. 3. 14.
R80.26.1'
R15.31 6'
4.
R76.6.65'
RII 8.0Sk
TP3
EYE
R77.93.1'
Rll 93.1'
+3.0VOC AT 2100HZ
O.OVOC AT 1100HZ
-3.010C AT 1300HZ
0.03 !LAC lAX
+1
R81,10',5%
R82.10',5%
I
CARRIER DETECT TIMING
C21
.01
CARRIER lEVEL DETECT
m
+IIV 11TH
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-9V=CD
+10V=CO
CR4,
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CR10
~+-_...:':::A:::RK'-4~2.
212
TP4 -1 OV=MARK OR CD
RO
+10V=SPACE AND CO
+CARRlER DETECT
~9
212
CR5
+51
70',5%
TP5
CD
+IOV=CO
•
R83. 4. 1.' +DATA SET READY
~~.~~~~~-4)~
212
5%
-IOV=CO
()
62940007 D
5-59
•
U1
3
4
2
I
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o
o
(lPS -11.
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flPS .'2
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.!
~>-----l
UIOLESS OTI.J~Ii?WISE NOTm ALL OIOO£S
TO BE PIN 510073 E,'5.
B
-sv
J. UNLESS OTHERWISE NOTED ALL CIRCUITS ARE PART OF A
BCHP BOARD
0\
t\.)
\0
~
o
o
o
MODEM OPTION;
rOEIOENT
POWER,GROUND,a DECOUPLING 15920
,...J
3
2
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!.!.=.4 >-!l:4>-~)
Ne
a::
1&.1
Ne
II
RING
I~~o
R
fVYV'
(GREEN)
)~
600
IIOOOV
~
~
1&.1
Z
::::i
LINE
:IE
1&.1
N
PHONE
c
62940007 0
T
0
O
rE-
600
>-'......_ _ _ _ _ _ _---.J~~-----::ll--~).~
~) RING
600
~
TIP
l.!.o4
MI
!!.:.4
Mle
il=4
!l=.4
ll=4
(REO)
:IE
II
TP
~>--
Nt
~>--
Nt
I ~~o
~")
1l000V
o
CD
5-61
•
6
MA INTENANCE
This section provides the information necessary to perform site
maintenance on the terminal.
Information is organized under the
following major headings:
•
Suggested Emergency Maintenance Procedure - describes the
suggested approach to emergency maintenance.
•
Maintenance Aids - describes the diagnostics available to
troubleshoot the terminal.
•
Preventive Maintenance - describes the follow-up tasks to
be done when a terminal requires repair.
•
Special Tools and Supplies - describes special items
required for terminal maintenance.
•
MOS Circuit Handling Precautions - describes special
procedures to be used when replacing MOS circuits.
•
Diagnostic and Corrective Maintenance Procedures contains SAM (structured analysis method) listings that
provide information for troubleshooting terminal ma,lfunctions and associated corrective maintenance procedures.
Preceding the listings and procedures is a description of
the format and use of the SAMs.
SUGGESTED EMERGENCY MAINTENANCE PROCEDURE
The following procedure provides suggested steps for the customer engineer (CE) to follow when responding to a customer
request for maintenance on the terminal.
BEFORE LEAVING FOR CUSTOMER SITE
Before leaving for the customer site, the CE should call the
customer and talk to the person operating the terminal at the
time the malfunction occurred, then:
62940007
6-1
1. Determine the following:
a. Specific configuration of terminal; for example, does
it have an internal modem, additional RAM, and/or
additional ROM/EROM installed.
b. Type of symptoms terminal exhibited to indicate that a
malfunction occurred.
c. Whether terminal is operating and what symptoms, if
any, are present when an attempt is made to operate.
2. Decide course of action to take, for example:
a. Go to customer site and begin troubleshooting.
b. Deduce that terminal itself is probably not at fault
and most likely cause of problem is either communication lines or a power reduction or loss.
In either
case, CE can notify responsible party (common carrier
or customer) of problem.
c. Decide that an error in operating procedure rather
then equipment failure is probable cause of problem,
and notify customer of correct operating procedure.
3. If a site maintenance trip is required, CE should try to
determine a probable cause for failure and gather necessary tools, manuals, and spare parts that may be needed.
UPON ARRIVING AT CUSTOMER SITE
Upon arriving at the customer site, the CE should locate the
appropriate supervisory personnel and again talk to the terminal
operator concerning the malfunction, then:
1. Visually inspect terminal to ensure that correct input/
output cable connections exist.
2. Verify that a malfunction does exist, and then begin to
troubleshoot terminal.
This is done by:
a. Running the diagnostics described later in this
section.
b. Referring to the SAM in this section that covers the
malfunction and doing the prescribed corrective
actions.
6-2
62940007 B
3. After source of malfunction is corrected, CE should:
a. Rerun diagnostics to ensure that terminal is
operational.
b. Perform preventive maintenance tasks listed in this
section.
c. Demonstrate to customer that terminal is now operating
properly.
MAINTENANCE AIDS
Resident diagnostics provide error indications of basic hardware
faults.
PLATO system diagnostic (DIAG), accessible in the PLATO
and Data Services networks, provides additional tests.
RESIDENT DIAGNOSTICS
The following paragraphs describe the sections of the terminal
resident diagnostic program. The actual running of the resident
diagnostics is described later in this section in procedure 2.
The program consists of three sections:
•
•
•
RAM tests
Interface tests
Crt alignment, touchpanel, and keyboard tests
RAM Tests
These tests check the operation of RAM by:
•
Writing/reading 5516 (010101012) code in all available
memory locations.
•
Writing/reading AA16 (101010102) code in all available
memory locations.
•
Writing test codes into test addresses and reading all
memory to ensure that the codes were written in desired
addresses only.
62940007 B
6-3
Interface Tests
The interface tests check the operation of the circuits that
handle PLATO communications, ASCII communications, and SERIALinterface communications.
PLATO Communications Test
This test checks that the status and control lines of the PLATOcommunication logic are functioning properly and checks that
these circuits can receive and transmit data correctly. The
following conditions are tested:
•
Character request status is present.
•
Character request status does not drop after low-order
bits are output.
•
Character request status drops after the high-order bits
are output.
•
First byte flag is set.
•
Start bit is present.
•
Character ready status is present.
ASCII Communications and SERIAL-Interface Communications Tests
These tests check that the control and status lines of the
ASCII-communication logic and SERIAL-interface logic are functioning properly and that each set of circuits can receive and
transmit data correctly at 9600 bps, using an internal loopback
feature. The following conditions are tested:
6-4
•
Character request status present.
•
'Character read status present.
62940007
CRT Alignment, Touchpanel, and Keyboard Tests
This section consists of three test segments. These are an
alignment pattern, a touchpanel test, and a keyboard test.
The alignment pattern consists of four lines outlining the
screen border with two diagonal lines intersecting at screen
center. This pattern is used to check for correct crt alignment
and touchpanel installation.
The touchpanel has 256 touch-sensitive areas. Touching anyone
of these areas causes the screen in that area to be displayed in
inverse video. Repeated touches cause repeated inversions.
The keyboard segment displays a binary representation of the
hexadecimal code generated as a key is pressed. This binary
representation shows long bars for binary Is and short bars for
binary Os, with the bottom bar being the lowest order bit.
PLATO SYSTEM DIAGNOSTIC (DIAG)
If the terminal site is subscribed to either the PLATO network
or Data Services network, PLATO system diagnostic-lesson DIAG
can be used to troubleshoot the terminal.
Available tests in
the lesson include a pattern test, character tests, and a
keyboard/touchpanel test.
Before lesson DIAG can be accessed, controlware from the
respective network-host computer must be loaded per the startup
instructions in the terminal operator's guide (refer to preface
for publication number).
If this is done from the Data Services
host, the controlware file that is loaded must be for PLATO mode
in order to access the lesson.
After successful loading, lesson DIAG is accessed per the
instructions in the troubleshooting portion of the terminal
operator's guide.
PREVENTIVE MAINTENANCE
Preventive maintenance should be performed immediately following
and as a part of an emergency maintenance call. The following
suggested preventive maintenance steps help to minimize maintenance calls by verifying correct crt alignment and related
operations of the terminal. General inspection of the terminal,
including proper seating of cable connectors, should also be
made. Procedures referred to are found after the SAMs in this
section.
62940007 D
6-5
I
Remove power from terminal (procedure 1) and clean as follows:
CAUTION
Do not use solvents to clean keyboard. Solvent can cause defective
keyswitch operation and damage
keycaps.
The following agents may be used for
exterior cleaning surfaces including
key tops.
Bafix Germicidal Cleaner (Hysan)
Tide Detergent (2% in H2 0 solution)
Joy Detergent (1% in H 2 0 solution)
Formula 409 Household cleaner
Windex with Ammonia
Harmful examples of agents not to be
used are:
Gasoline
Carbon tetracloride
Acetone
MEK (Methyl-ethyl-ketone)
Methanol (wood alcohol)
Ethanol (grain alcohol in concentrated form)
Gun cleaner (Hoppe's #9)
Freon (except freon #12)
Iodine
Liquid bleach
1. Dust keyboard with soft-bristled brush.
2. Clean touchpanel in front of crt screen using a soft
cloth dampened with a mild soap and water solution.
Apply cleaning solution to cloth to prevent solution from
entering behind the bezel. Avoid splashing solution on
keyboard.
3. Wipe exterior of the terminal using a damp lint-free
cloth~
Reapply terminal power (procedure 1) and verify correct display
alignment as follows:
4. Set SKIP/KB&TP switch behind protective door on operator
panel to KB&TP.
Set SKIP/TEST switch to TEST. Press
RESET switch for 3 seconds or longer to run resident
diagnostics and have alignment pattern appear. If
controlware is loaded, this may require pressing RESET
twice, each time for 3 seconds or longer.
6-6
62940007 D
5. Check for correct alignment and acceptable display
quality (refer to procedure 22).
If required, perform
related adjustments per procedure 4.
6. Return SKIP/KB&TP and SKIP/TEST switches to SKIP.
SPECIAL TOOLS AND SUPPLIES
In addition to a normal complement of metric hand tools and test
equipment, maintenance of this terminal requires the following
special items:
•
Alignment tool kit part number 12263463 for doing adjustments on the power supply and display boards. These
adjustments may alternately be done using alignment tool
part number 12263476 and hex adjustment tool part
number 12263299. If the hex adjustment tool is used, its
hook must be cut off to prevent the tool from locking in
adjustment slugs of the display board.
•
Chip removal tool part number 87365900 for removing
14-pin and 16-pin integrated-circuit chips from boards.
•
Silicone adhesive part number 51004063 for glueing yoke
centering rings.
MOS CIRCUIT HANDLING PRECAUTIONS
The controller and video boards contain a number of MOS (metaloxide semiconductor) integrated circuits. The MOS circuits are
susceptible to irreparable damage if they are exposed to excessive static electricity and thus require special handling.
Follow the precautions listed here at all times when handling
either board.
•
Never insert, remove, or otherwise connect/disconnect any
circuit(s) while power is applied.
CAUTION
To prevent accidental shock when
observing static-grounding precautions, do not touch powered-on electrical equipment and chassis frame
at the same time.
•
Before touching (with hands and/or tool) or handling any
circuit, cable connector, or board, always touch hand(s)
(and/or tool) to an exposed portion of the associated
chassis frame to discharge any buildup of static
electricity.
62940007 D
6-7
I
•
Especially in dry ambient air, any movement may cause
static electricity buildup due to friction.
In the case
of shuffling one's feet across a dry carpet, such static
buildup may be quite high and may easily jump from a
cable connector being held onto the pins being mated to.
This could damage the MOS circuits within the equipment.
Thus, the chassis frame must always be touched immediately before connecting any cable to it.
•
When removing, replacing, or otherwise handling any board
that contains MOS circuits, do not touch circuit paths or
conductors if at all possible.
Do not carry a MOS circuit board across a room while touching its circuits.
•
When a board is removed from the chassis and placed where
it may be touched, carried to some other location, or if
it is to be shipped, wrap the board in static protective
material, such as aluminum foil or conductive foam.
DIAGNOSTIC AND CORRECTIVE MAINTENANCE PROCEDURES
This portion of the section contains the SAMs and corrective
rna intenance procedures for the terminal. The SAM 1 istings
provide information for isolating a malfunction and refer to the
applicable corrective maintenance procedure for correcting it.
The corrective maintenance procedures cover the available
terminal adjustments and the replacement of field-replaceable
components.
.
The next paragraphs describe the format and use of SAMs and
explain the organization of the SAMs and procedures that follow
in the section.
SAM FORMAT
An example SAM showing the basic SAM format appears in
figure 6-1. A SAM is a formatted listing that presents
troubleshooting information in a logical manner.
Each SAM
contains a sequential listing of questions that can be answered
yes or no. The response made to a particular question either
leads to the next question or to the specific action (or
numerical sequence of actions) that is to be taken to correct
the problem.
Each SAM listing is identified by a SAM number and a title that
denotes the type of problems that it covers. A hyphen and
number following the SAM number identifies the pages within the
listing.
62940007
6-8
USE OF SAMs
The SAMs are to be used in conjunction with the diagnostics
described earlier in this section. After diagnostics are run,
or if they cannot be run, refer to the SAM that covers the
existing problem. Verify that all assumed conditions stated at
the beginning of the SAM are present and observe any preliminary
instructions. Enter listing and answer yes (Y) or no (N) to the
question asked or the condition being tested. Follow down the
appropriate Y or N column and when column leads to action
numbers, perform the corresponding actions in numerical order to
correct the problem.
MAINTENANCE
SYMPTOM/QUESTION
RESPONSE FOR QUESTION
BEING ASKED
I
I
INDICATES FOOTNOTE
(NOTES ARE LISTED ON
LAST PAGE OF SAM)
STEP NUMBERS
SAM 4271
(USED FOR IDENTIFICATION ~
PURPOSES ONLY)
"'his SAM aSSUI.
l. ~t
629479lB
'S
trlp.
power is applied and circuit breaker Cal does
PATH TO FOLLOW FOR YES
(§]])([]) alank screen (no video or raster) CONTRAST and
RESPONSE TO F I R S T "
INTENSITY controls have no effect?
QUESTION
0021~ Y N Raster present (screen lit) but no video?
003~:
: Y N
Video display or control problem?
INDICATES THAT THIS IS
004 " y N Offline keyboard input problem?
THE ONLY ACTION TO BE ~05
; ; ; ; ~ N Power on diagnostic error? (1)
TAKEN
I · -,,,,
006 :
:
:
:
.!
Run auto tests (enter 84200).
If unable to
"establish communication, check rIo connectors,
AFICRTsIOTNA-C-T-IO-N-T-O-B-E--~-----:-I----00-7-:-~_.-/;"\l:-~,-:--:---:--\ ~:~:~~~~e~!~~e f~~t:~~7~~!n~:~d~
PERFORMED IN THIS
COLUMN
UNDERLINE INDICATES
THE LAST OF A NUMER1cAL SEQUENCE OF
ACTIONS IN A GIVEN
COLUMN
;~~~~e~or
009
010 ,
011
Replace applications module (para 3.3).
5
~.~~
~~~~~~:i~'~"T~~s"E ~r
I
---.
INDICATES SAM IS CONTlNUED ON PAGE 2,
COLUMN A
If problem
connections.
OOB , ,
014
COLUMN
c~ble
Check for loose internal
~OlB r
ill;
correct seating of applications
Replace logic/power supply hoard
Replace keyboard assembly
(para 3.4).
(para 3.11).
Check INTENSITY and CONTRAST controls for open
circuit (para 3.13.2).
Replace if open.
Check monitor PC board adjustments (para
3 _ B_2)
_
Replace monitor PC baarn (para 3.B).
Check video Faston connector
(.J5 pin 6).
Check fuse F3 (3.0 A fast blow).
Check for open CONTRAST control (para 3.13.2).
Check 30 V Return Faston connector (J5 pin 2).
VISUAL DISPLAY/CONTROL PROBLEMS
SAM 4271-1
03388
Figure 6-1.
62940007
Example of a SAM
6-9
ORGANIZATION OF SAMs AND PROCEDURES
The organization of the following SAMs and corrective maintenance procedures is shown in figure 6-2.
SPEED INDEX
TERMINAL
TROUBLESHOOTING
INFORMATION
PROCEDURES AND
REFERENCE FIGURES
SAMs
01642-5
Figure 6-2.
6-10
Organization of SAMs and Corrective
Maintenance Procedures
62940007
WARNING
LETHAL VOLTAGES EXIST IN THE CRT MONITOR
ASSEMBLY. USE EXTREME CAUTION WHEN PERFORMING INTERNAL ADJUSTMENTS OR SEVERE
PERSONAL INJURY OR LOSS OF LIFE MAY
RESULT.
CAUTION
MANY OF THE INTEGRATED CIRCUITS USED IN
THIS TERMINAL ARE MOS TYPE THAT CAN BE
DESTROYED BY STATIC ELECTRICITY. ALWAYS
OBSERVE THE RULES FOR HANDLING MOS CIRCUITS AS DESCRIBED EARLIER IN THIS
SECTION.
NOTE
TO AVOID REVERSED CABLE CONNECTIONS, REFER
TO FIGURES 6-11 AND 6-12 WHEN MAKING CONNECTIONS TO VIDEO AND CONTROLLER BOARDS.
SAM 1-1
SAM 1 - POWER-ON PROBLEMS
Assumptions: SKIP/TEST switch behind protective door is in SKIP
position to bypass resident diagnostics and terminal power cord
is connected to a live power outlet.
001
N Y
Building circuit breaker for power outlet remains set
when terminal ON/OFF circuit breaker is pressed to ON?
I
I
002
N Y
Terminal ON/OFF circuit breaker remains set when
pressed to ON?
I
I
003
N Y
004
I I
I I
I 1
I
I
005
1
Turn BRIGHTNESS control clockwise to check that it
is not set too low.
006
2
Verify that power cord is securely seated in receptacle on ac entry panel.
007
3
Remove hood (procedure 3) and check cabling for loose
connections.
008
4
Check LEOs on power supply board (figure 6-17) ahd do
the following as applicable:
I
I
I
I
I
I
A message appears on screen after approximately
45 seconds.
Power on occurred successfully.
nostics (procedure 2).
Run resident diag-
• If all five LEOs are lit, check/adjust power
supply voltages (procedure 9) to make sure they
are correct.
If any voltages are bad, go to
SAM 3 (Bad Power Supply Voltages).
• If none are lit, go to step 010 in this SAM and
isolate open in ac-entry circuits.
• If only the +55-V LED is lit, go to SAM 3
(Bad Power Supply Voltages).
• If none of the above, replace power supply board
(procedure 10).
009
5
I
I
I
I
I
If no raster (illumination) appears on screen when
BRIGHTNESS control is fully clockwise, go to SAM 2
(No Raster). If a raster is present, run resident
diagnostics (procedure 2) and go to SAM 4 (Resident
Diagnostic Errors/Problems) to further troubleshoot
problem.
322
ABC
62940007
6-11
SAM 1-2
B C
1 1
010
I I
I 6
I
I
I
I
I
I
I
I
I
I
I
I
If all LEDs are unlit on power supply board, Isolate
open in ac-entry circuits as follows:
a. Press ON/OFF circuit breaker to OFF and disconnect
power cord from outlet.
b. Check blue and brown ac-entry wiring for a loose
connection or damage. This wiring starts at power
cord receptacle on ac entry panel and ends at
power supply board.
c. Disconnect power cord from ac entry panel receptacle and check continuity of power cord. Replace
if open.
d. Slide connectors back to access terminals on line
filter and check continuity of line filter.
verify that continuity exists between terminals
with same colored wires.
If not, replace line
filter (procedure 11).
e. If terminal is a domestic unit, replace ON/OFF
circuit breaker (procedure 12). If terminal is an
international unit, replace ON/OFF circuit breaker
(procedure 12) and stepdown transformer (procedure 11) one at a time.
011
1
Remove hood (procedure 3) and isolate short as follows:
NOTE
The following corrective actions assume
that cables are good. Before replacing
an item, check associated cables for
damage or shorts. When connecting
cables to video and controller boards,
refer to figures 6-11 and 6-12 to
verify correct pin alignment.
a. Disconnect power cable from BJ3 on video board and
board-edge connector from monitor display board.
b. Press ON/OFF breaker to ON.
If breaker trips and
terminal is a domestic unit, replace power supply
board (procedure 10).
If breaker trips and
terminal is an international unit, disconnect
3-pin connector from power supply board and
(Step 011 continued on SAM 1-3).
6-12
62940007
A
SAM 1-3
1
I
I
I
I
I
I
I
retry. If breaker trips, replace stepdown transformer (procedure 11); if not, replace power
supply board.
c. Press breaker to OFF. On video board, reconnect
power cable to BJ3 and disconnect cable from BJI.
d. Press breaker to ON. If breaker trips, replace
video board (procedure 6).
e. Press breaker to OFF. Reconnect board-edge connector on monitor display board.
f. Press breaker to ON. If breaker trips, replace
display board (procedure 18).
g. Press breaker to
video board. On
cables from AJ2,
be at AJ5 unless
OFF. Reconnect cable to BJI on
controller board, disconnect
AJ3, AJ4, and AJ5 (no cable will
an internal modem is installed).
h. Press breaker to ON. If breaker trips, replace
controller board (procedure 7).
i. Press breaker to OFF. Reconnect cables to controller board as follows to see which one makes
breaker trip. Press breaker to OFF while making
connections.
Reconnect
Replace if Breaker Trips
AJ2
Keyboard assembly (procedure 13)
AJ3
Touchpanel (procedure 20)
AJ4
Operator panel (procedure 14)
AJ5
Internal modem board (procedure 21)
012
1
Remove hood (procedure 3) and check blue and brown
ac-entry wiring from power cord receptacle to ON/OFF circuit breaker for a short.
013
2
I
I
I
Disconnect power cord from outlet. Slide connectors back
to access terminals on line filter and check continuity
of line filter. Verify that continuity exists between
terminals with same colored wires, and that no continuity
exists between terminals with different colored wires.
If not, replace line filter (procedure 11).
I
I
I
I
I
I
014
3
62940007
Replace power cord.
6-13/6-14
SAM 2-1
SAM 2 - NO RASTER
Assumptions: All LEDs are lit on power supply board and no
raster (illumination) appears when BRIGHTNESS control is turned
fully clockwise.
001
N Y
Fuse OK on monitor display board (figure 6-8)?
I
002
N Y
+55 +1.10 V present at fuse on display board (for
ground, use ground side of C35 shown in figure 6-18).
I
I
003
N Y
LED lit on display board (figure 6-8)?
I
004
N Y
CRT filament lit?
I
005
1
Check BRIGHTNESS control as follows:
I
a. Press ON/OFF circuit breaker to OFF and
disconnect power cord from outlet.
b. Disconnect board-edge connector from display board.
c. Connect one ohmmeter lead to pin 4 of boardedge connector, and other lead to either
adjacent pin 3 or pin 2 (pin numbering of
board-edge connector is shown on display
board) •
d. Set meter to X1000 setting and check that
meter reads 0 ohm when BRIGHTNESS control
is turned in one direction, and that resistance steadily increases to 100 kilohms
when it is fully turned in opposite direction.
If not, replace BRIGHTNESS control
(procedure 16).
006
2
I
I
I
I
I
I
I
I
3
007
I
With power off, check seating of the following
connections:
• Lead from flyback transformer on display
board to doubler/bleeder assembly (above
and left of display board)
• Yoke connector at S02 of display board
Replace doubler/bleeder assembly (procedure 19).
2 2 2 2 2
A B C D E
62940007 B
6-15
ABC D E
SAM 2-2
11111
008
009
010
011
012
013
I
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I
I
I
I
I
I
I
I
1
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
1
t
I
I I
1 2 4
-
Press ON/OFF breaker to OFF. Wait 60 seconds for
crt to bleed off power and check seating of
socket at end of crt.
Replace display board (procedure l8).
I I
3 5
Replace matched yoke/crt (procedure 18).
1
Check seating of cable leading from power supply board
to board-edge connector on display board.
2
Do +55-V adjustment (procedure 9). If unable to
adjust, replace power supply board (procedure 10).
I
I
Press ON/OFF breaker to OFF and replace fuse.
If fuse
blows again when power is applied, replace fuse and
the following items one at a time:
a. Display board (procedure l8)
b. Doubler/bleeder assembly (procedure 19)
c. Matched yoke/crt (procedure 18)
6-16
62940007
SAM 3-1
SAM 3 - BAD POWER SUPPLY VOLTAGES
Assumptions: Power is on, all cabling connected, and one or
more voltages found bad during check/adjustment of power s~pply
voltages or entry from SAM 1 (Power-On Problems) or SAM 4
(Resident Diagnostic Errors/Problems).
NOTE
The corrective actions in this SAM
assume that cables are good. Before
replacing an item, check associated
cables for damage or shorts. When
connecting cables to video and
controller boards, refer to figures
6-11 and 6-12 to verify correct pin
alignment. Pin numbering of cable
connectors appears in vicinity of
mating connectors on boards.
001
002
N Y
All five LEDs lit on power supply board?
I
N Y
+5 +0.25 V present across C78 on controller board
(figure 6-l6)?
I
I
003
N Y
-12 +0.60 V present across C79 on controller board
(figure 6-l6)?
I
I
004
N Y
+12 +0.60 V present across C66 on video board
(figure 6-l9)?
I
I
005
N Y
-5 +0.25 V present across C83 on video board
(figure 6-l9)?
I
I
006
N Y
I
I
I
I
I
007
008
I
I
I
1
1
I
009
010
3
011
1
I
Power supply voltages are OK.
If fuse is blown, go to SAM 2 (No Raster).
2
I
+55 +1.10 V present at fuse on display board
(for-ground, use ground side of C35 shown in
figure 6-18).
If not yet done, do +55-V adjustment (procedure 9).
Replace power supply board (procedure 10).
If voltage is more negative then tolerance,
replace power supply board (procedure 10).
5 3 322
ABC D E
62940007
6-17
SAM 3-2
D E
1 1
I
012
2
I
I
I
I
I
I
I
013
3
If voltage is less negative than tolerance, press
Disconnect power cable from
BJ3 on video board and press breaker to ON. Measure
for -5 +0.25 V at pin 11 of loose end of power cable
(pin 6 Is ground). If voltage is bad, replace power
supply board (procedure 10). If voltage is good, proceed to next step and isolate load fault.
ON/OFF breaker to OFF.
Isolate load fault as follows:
a. Press breaker to OFF and reconnect power cable to
BJ3. Disconnect cable from BJI on video board.
b. Press breaker to ON and measure for -5 +0.25 V
across C83 on video board. If voltage 1s bad,
replace video board (procedure 6). If voltage is
good and no internal modem is installed, replace
controller board (procedure 7).
c. If an internal modem is installed, press breaker
to OFF and reconnect cable to BJI. Disconnect
modem cable from AJ5 on controller board.
d. Press breaker to ON and measure again across C83
on video board. If voltage is bad, replace controller board (procedure 7). If voltage remains
good, replace internal modem board (procedure 21).
014
015
1
I
I
2
I
I
I
016
I
I
I
I
3
If voltage is greater than tolerance, replace power
supply board (procedure 10).
If voltage is less than tolerance, press ON/OFF breaker
to OFF. Disconnect power cable from BJ3 on video board
and press breaker to ON. Measure for +12 +0.60 V at
pin 5 of loose end of power cable (pin 8 is ground). If
voltage is bad, replace power supply board (procedure 10).
If voltage is good, proceed to next step and isolate load
faul t.
Isolate load fault as follows:
a. Press breaker to OFF and reconnect .power cable to
BJ3. Disconnect cable from BJI on video board.
b. Press breaker to ON and measure for +12 +0.60 V
across C66 on video board. If voltage is bad,
replace video board (procedure 6). If voltage is
good and no internal modem is installed, replace
controller board (procedure 7).
(Step 016 continued on SAM 3-3)
6-18
62940007
B C
1 1
017
018
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
1
I
I
I
I
I
I
I
I
I
I
019
3
SAM 3-3
c. If an internal modem is installed, press breaker
to OFF and reconnect cable to BJI. Disconnect
modem cable from AJ5 on controller board.
d. Press breaker to ON and measure again across C66
on video board. If voltage is bad, replace controller board (procedure 7).
If voltage remains
good, replace internal modem board (procedure 21).
If voltage is more negative than tolerance, replace
power supply board (procedure 10).
If voltage is less negative than tolerance, press
ON/OFF breaker to OFF. Disconnect power cable from
BJ3 on video board and press breaker to ON. Measure
for -12 +0.60 V at pin 13 of loose end of power cable
(pin 6 is ground).
If voltage is bad, replace power
supply board (procedure 10). If voltage is good,
proceed to next step and isolate load fault.
Isolate load fault as follows:
a. Press breaker to OFF and reconnect power cable to
BJ3. Disconnect cable from AJI on controller
board.
020
021
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
1
b. Press breaker to ON and measure for -12 +0.60 V at
pin 41 of loose end of cable (pin 44 is ground).
If voltage is bad, replace video board (procedure 6).
If voltage is good and no internal modem
is installed, replace controller board (procedure 7).
c. If an internal modem is installed, press breaker
to OFF and reconnect cable to AJI.
Disconnect
modem cable from AJ5 on controller board.
d. Press breaker to ON and measure for -12 +0.60 V
across C79 on controller board.
If voltage is
bad, replace controller board (procedure 7).
If
voltage is good, replace internal modem board
(procedure 21).
If not yet done, do +5-V adjustment (procedure 9).
I
2
I
I
I
If voltage is greater than tolerance, replace power
supply board (procedure 10).
4
B
62940007
6-19
B
1
SAM 3-4
I
022
3
I
I
I
I
I
I
I
023
4
If voltage is less than tolerance, press ON/OFF breaker
to OFF. Disconnect power cable fromBJ3 on video board
and press breaker to ON. Measure for +5 +0.25 V at pin 9
of loose end of power cable (pin 6 is ground).
If voltage is bad and cannot be adjusted, replace power supply
(procedure 10). If voltage is now good, proceed to next
step and isolate load fault.
Isolate load fault by doing the following. After
faulty module is replaced, do +5-V adjustment (procedure 9) with all cabling connected.
a. Press breaker to OFF. On video board, reconnect
power cable to BJ3 and disconnect cable from BJ2.
On controller board, disconnect cable from AJl.
b. Press breaker to ON and measure for +5 V at pin 45
of loose end of cable that has been disconnected
from controller board (pin 50 is ground).
If voltage is bad, replace video board (procedure 6).
c. Press breaker to OFF.
video board.
Reconnect cable to BJ2 on
d. Press breaker to ON and measure again at pin 45 of
loose end of cable.
If voltage is bad, replace
monitor display board (procedure 18).
e. Press breaker to OFF and reconnect cable to AJI.
Disconnect cables from AJ2, AJ3, AJ4, and AJ5 on
controller board (no cable will be at AJ5 unless an
internal modem is installed).
f. Press breaker to ON and measure for +5 V across C78
on controller board.
If voltage is bad, replace
controller board (procedure 7).
g. Press breaker to OFF. Reconnect cables to controller board as follows to see which one makes
+5 V bad across C78. Press breaker to OFF while
making connections.
Reconnect
6-20
Replace if +5 V Goes Bad
AJ2
Keyboard assembly (procedure 13)
AJ3
Touchpanel (procedure 20)
AJ4
Operator panel (procedure 14)
AJ5
Internal modern board (procedure 21)
62940007
SAM 3-5
A
I
t
024
I
Do the following as applicable:
• If all five LEOs are unlit, go to SAM 1 (Power-On
Problems).
• If only the +55-V LED is lit (figure 6-17), insert
adjustment tool through +5-V access hole in monitor
chassis. Adjust +5-V potentiometer and check whether
other four LEOs corne on. If so, finish adjusting
+5 V per procedure 9; if not, replace power supply
board (procedure 10).
• If neither of the above, replace power supply board
(procedure 10).
62940007
6-21/6-22
SAM 4-1
SAM 4 - RESIDENT DIAGNOSTIC ERRORS/PROBLEMS
Assumptions: Resident diagnostics executed per procedure 2 and
an error detected or diagnostics will not run correctly.
001
002
003
004
005
Y NAIl LEDs on operator panel light and stay on after
I releasing RESET switch?
I
Y N No LEDs on operator panel light when RESET switch is
I pressed.
I
Y N Only some LEDs on operator panel light when RESET
I switch is pressed?
I
Y N Error 01 or 02 occurred?
I
Y N Error 03 occurred?
I
Y N
006
Error 04 occurred?
I
Y N
I
007
008
Error 05 occurred?
SKIP/TEST switch in TEST position and
RESET switch pressed for 3 seconds or
longer several times but diagnostics do
not start (LEDs on operator panel do not
cycle on and off)?
Y N
I
I
I
I
I
009
Y N
I
I
Absence of response when any key is
I pressed?
I
Y N Absence of response when a
I particular key is pressed?
I
Y N Wrong binary code shown for a key?
I I
I Y N Touchpanel test does not cause
I I I
video inversion or operates
I I I
incorrectly?
010
Y N
011
012
013
014
015
SKIP/KB&TP switch in KB&TP position but
alignment pattern does not appear?
I
I
I
I
I I Y N Diagnostic hangs and/or alarm
I I I I sounds constantly?
I
I
I
I
I
I
I
I
I
I I I -
I
1
Problem not covered.
assistance
Call for
3 3 3 333 3 2 222 222
ABC D E F G H I J K L M N
62940007
6-23
H I J K L MN
1 1 1 1 1 1 1
I
I
I
I
I
016
017
018
1
I
I
I
I
019
2
1
020
021
1
022
1
I
I
I
I
I
023
2
I
I
024
3
025
1
I
I
026
2
I
I
SAM 4-2
I
1
Replace video board (procedure 6).
I
2
Replace controller board (procedure 7).
Remove hood (procedure 3) and check connection
of touchpanel cables at AJ3 on controller
board. Figure 6-12 shows proper pin alignment
of cables.
Replace controller board (procedure 6) and
touchpanel (procedure 20) one at a time until
condition is corrected.
Replace keyboard assembly (procedure 13) and controller board (procedure 7) one at a time until
condition is corrected.
Replace corresponding keyswitch (procedure 13).
Hold "0" key down and press RESET switch for 3 seconds
to rerun diagnostics. When alignment pattern appears,
release "0" key.
If a keyswitch is shorted, its
binary code appears on screen. Replace indicated keyswitch (procedure l3).
Remove hood (procedure 3) and check that keyboard
cable is secure at AJ2 on controller board
Replace keyboard assembly (procedure l3) and controller board (procedure 7) one at a time until
condition is corrected.
Turn BRIGHTNESS control clockwise to check that it is
not set too low.
Remove hood (procedure 3) and check that all five LEDs
are lit on power supply board (figure 6-l7). If not,
go to SAM 3 (Bad Power Supply Voltages),.
I
027
3
If no raster (illumination) appears with BRIGHTNESS
control turned fully clockwise, go to SAM 2 (No
Raster).
028
4
Go to SAM 5 (Video Problems).
029
I
I
I
1
I
I
I
Remove hood (procedure 3) and check internal cable
connections. Make sure connections are secure and that
cables to video and controller boards are connected correctly. Figures 6-11 and 6-12 show proper pin alignment.
3
H
6-24
62940007 B
ABCDEFGH
111 I I I 1 2
I
I
I
I
030
SAM CRT4-3
I
2
I
I
I
I
I
I
I
031
3
Check LEOs on power supply board (figure 6-17). If all five LEOs are lit,
check/adjust power supply voltages
(procedure 9) to verify they are correct.
If any voltages are bad or any of the five
LEOs are unlit, go to SAM 3 (Bad Power
Supply Voltages).
Replace the following items one at a time
until condition is corrected:
a. EROM chip on video board that contains
resident firmware program (procedure 8)
b. Controller board (procedure 7)
c. Video board (procedure 6)
032
1
1
033
1 2
Replace Z80A-SIO/2 chip on controller board
(procedure 8).
I
034
1
1
Second ind ication in LEOs identifies in which RAM
chip error occurred (figure 6-4). Replace corresponding RAM chip on video board (procedure 8).
2
Check power supply voltages (procedure 9). If any
voltages are bad, go to SAM 3 (Bad Power Supply
Vol tages) •
I
I
035
1
-I
1
036
Replace controller board (procedure 7).
3 1
Replace video board (procedure 6).
1 1
037
142
038
2
1
Replace controller board (procedure 7).
Replace LEO(s) that did not light (procedure 15).
Then rerun resident diagnostics.
039
1
Remove hood (procedure 3) and check internal cable
connections.
040
2
Check power supply voltages (procedure 9). If any
voltages are bad, go to SAM 3 (Bad Power Supply
Vol tages) •
I
I
I
I
I
041
3
Replace operator panel (procedure l4).
I
042
043
1 4
I
2
Replace controller board (procedure 7).
Replace operator panel {procedure l4}.
62940007 B
6-25/6-26
SAM 5-1
SAM 5 - VIDEO PROBLEMS
Assumptions: RAM and interface resident diagnostics ran without
error and raster (illumination) appears when BRIGHTNESS control
is turned fully clockwise.
Instructions: Set SKIP/TEST and SKIP/KB&TP switches to TEST and
KB&TP positions. Press RESET switch for 3 seconds to run
resident diagnostics and have alignment pattern appear.
If
controlware is loaded, this may require pressing RESET twice,
each time for 3 seconds or longer.
001
002
Y N
Alignment pattern completely absent?
I
Display tilted or way undersize?
Y N
I
003
Display rolls vertically?
Y N
I
004
Pattern distorted or jittering?
Y N
I
005
Pattern off center or unsymmetrical?
Y N
I
006
Display resolution poor?
Y N
I
I
I
I
I
007
008
I
Y N
Pattern has extra video?
I I
I 1
I
Problem not covered.
009
I 1
I
010
1
I
I
I
I
011
2
Call for assistance.
Replace video board (procedure 6).
Adjust FOCUS potentiometer (procedure 4).
If
FOCUS and BRIGHTNESS have little affect, adjust
VIDEO GAIN potentiometer per procedure 4 to
check if it is set too far clockwise.
Replace monitor display board (procedure 18).
I
012
3
013
1
I
I
I
I
014
2
Replace matched yoke/crt (procedure 18).
Perform video adjustments (procedure 4).
If
display is not correct after those adjustments,
adjust yoke centering rings (procedure 5), then
repeat video adjustments.
Replace monitor display board (procedure 18).
222 2
ABC D
62940007
6-27
SAM 5-2
A B C D
1 1 1 1
I
I
I
I
015
016
I
1
Perform video adjustments (procedure 4).
2
Replace monitor display board (procedure 18).
I
017
I I
I 3
I
018
1
I
I
I
I
019
2
I
020
3
I
021
4
022
1
Replace video board (procedure 6).
Remove hood (procedure 3) and verify that 50/60-Hz
switch on power supply board is set correctly (60-Hz
position for a domestic unit; 50-Hz position for an
international unit).
Adjust VERTICAL FREQ potentiometer (procedure 4).
Replace monitor display board (procedure 18).
Replace video board (procedure 6).
Remove hood (procedure 3) and do as follows:
WARNING
Lethal voltages exist in the crt
monitor assembly. Use extreme caution in doing the following and only
handle the plastic portion of the
yoke.
a. Loosen clamp screw securing yoke to neck of crt.
b. Rotate yoke to correct display tilt, and push yoke
so it is snug against rear of crt.
c. Make sure display is still straight and tighten
yoke clamp screw until snug. Do not overtighten.
d. Perform video adjustments (procedure 4).
023
024
1
I
I
2
Remove hood (procedure 3) and check cable connection at
BJ2 on video board.
Push and hold Flood Screen switch (figure 6-11) to either
side. This should illuminate the entire screen. If so,
replace video board (procedure 6); if not, replace the
following items one at a time until condition is
corrected:
a. 74S05 chip on monitor display board (procedure 8)
b. Video board (procedure 6)
c. Monitor display board (procedure 18)
6-28
62940007
SAM 6-1
SAM 6 - HOST LOADING PROBLEMS
Assumptions:
Internal switches and switches behind protective
door are set per the instructions in section 3, cabling
installed per section 3, resident diagnostics ran without error,
all associated communication devices are powered on, and loading
is being attempted from the PLATO network computer or the Data
Services network computer.
Instructions: Refer to terminal operator's guide (preface lists
publication number) and follow the applicable startup procedure.
NOTE
The corrective actions in this SAM
assume that cables are good. Before
replacing an item, check associated
cables for damage or shorts. When
connecting cables to video and controller boards, refer to figures 6-11
and 6-12 to verify correct pin
alignment.
001
002
003
Y N
HOST NOT CONNECTED displayed?
I I
I Y N LOADING FILE 00 displayed constantly?
I
I
I
Y N NO REPLY displayed and XMT LED flashes every 3 or 4
I
seconds?
I
I
I
I
I
I
I
I
I
I
005
006
007
008
NO REPLY displayed and XMT LED flashes only
occasionally?
Y N
004
I
I
Y N
I
I
I
I
I
I
I
I
HOST LOADING FAILURE momentarily displayed or
nothing displayed?
Y N
TERMINAL READY displayed, but cannot sign on?
I I
I 1 Problem not covered. Call for assistance.
I
Press RESET switch for 3 seconds or longer and
III 1 I
load.
retry
I I I I I
I I I I I
2 222 2 2
A BCD E F
62940007
6-29
ABC D E F
1 1 III 1
SAM 6-2
I I
009
2 2
010
2 3 3 2
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
011
012
I
I
I
I
I
I
I
014
3 5
016
I
I
I
I
I
2
3
I
I
I
Check power supply voltages (procedure 9).
If
any voltages are bad, go to SAM 3 (Bad Power
Supply Voltages).
Replace controller board (procedure 7).
I
4
1
verify that terminal is being connected to an
active network and that host computer is
operational.
I
I
I
441
013
015
If loading message shows block 0 loading and
then NO REPLY appears, verify that valid file
number is being used. Controlware file
number(s) are given in the requirements for
the network subscription.
If file number is
wrong and is not being entered through keyboard, remove hood (procedure 3) and change
settings of the appropriate pair of 55-1/-2 or
55-3/-4 switches on controller board (switch
settings are shown on decal inside hood).
I
I
I
I
I
I
I
I
I
I
5
-
If internal modem is being used, replace internal
modem board (procedure 21).
Replace controller board (procedure 7).
Verify that telephone connection is with an active
network, or if connection is direct, that connected
equipment is active.
If terminal has internal modem or is an international
unit, check that TALK/DATA switch is in applicable position for communications:
•
Internal modem installed - for PLATO communications,
switch must be set to DATA position after making
telephone connection with system. For Data Services
communications in an internal/external-modem arrangement, use of the switch varies with arrangement
(refer to equipment setup portion of terminal operato r • s g u ide) •
•
International unit (no international units have
internal modems) - if internal switch 52-1 is set for
switched Data Terminal Ready signal, TALK/DATA switch
must be set to DATA position after making telephone
connection with system.
If switch 52-1 is set for
constant Data Terminal Ready signal, position of .
TALK/DATA switch is irrelevant.
3
A
6-30
62940007
A
CRT 6-3
2
I
017
3
Check communication cabling and verify that connections
are secure.
.
018
4
If DTR (Data Terminal Ready) LED on operator panel is not
lit, replace controller board (procedure 7).
I
I
I
I
019
If internal modem is being used, remove hood (procedure 3)
and check that red stripe on modem-board cable is pointing
down and that cable is securely connected to AJ5 on conI
troller board. Also check that wires from telephone-jack
I
board
are correctly connected to terminals on modem board
I
(labeling
on boards show correct connections).
1
5
I
I
020
6
I
I
I
I
I
I
If an external modem is being used, it should issue Data
Set Ready and detect a carrier after telephone connection
is made. If modem has signal indicators, check for this
at modem. If these conditions are not present, modem is
at fault and responsible party should be notified. If
these conditions are present, replace cable between terminal and modem and retry.
I
021
7
I
I
I
022
8
62940007
If communications are via long-line receiver/driver and
RCV LED on operator panel does not blink, check cabling
to terminal for an open conductor or loose connector pin.
Replace controller board (procedure 7) and internal modem
board, if present (procedure 21), one at a time.
6-31/6-32
SAM 7-1
SAM 7 - LOCAL LOADING PROBLEMS
Assumptions: Resident diagnostics ran without error and
terminal is conditioned in one of the following ways to allow
local loading:
• ROM/EROM expansion option with resident controlware is
installed •
• RAM expansion option is installed, a flexible disk drive
is connected to the PARALLEL interface, the disk drive
and all other connected peripherals are powered on, and a
controlware flexible disk is installed in the disk drive.
Instructions: Refer to terminal operator's guide (preface lists
publication number) and follow applicable startup procedure.
001
002
003
004
Y N
I
I
I
I
I
I
I
Y N
I I
I I
I 1
I
1 1
I
005
006
Autoload or select load attempted from ROM and ROM
LOADING FAILURE displayed?
I
I
1
2
I
I
I
I
3
I
I
Autoload or select load attempted from flexible disk
drive and DISK LOADING FAILURE displayed?
Problem not covered.
Call for assistance.
Press RESET switch for 3 seconds or longer and retry
load.
Verify that flexible disk is correctly installed in
disk drive (refer to flexible disk drive hardware
maintenance manual, publication number is listed in
preface).
If another controlware flexible disk is available,
install in disk drive and retry loading.
007
4
Check that all cabling connections between terminal and
peripherals are secure and that a terminator is on last
device.
008
5
If disk drive does not move heads during load attempt,
run its resident diagnostics to check whether it is
operational (refer to flexible disk drive hardware
maintenance manual).
I
I
I
I
I
I
I
2 2
A B
62940007
6-33
SAM 7-2
A B
1 1
009
010
011
012
013
014
6-34
I
I
I
I
I
I
I
I
6
I
I
I
I
I
I 7
I I
I 8
I
I
2
I
I
I
I
I
I
3
I
I
4
If other devices than disk drive are connected to
PARALLEL interface, turn power off and disconnect them
from daisy chain. Install terminator on disk drive and
try loading to determine whether one of the other
devices are at fault.
Replace controller board (procedure 7).
Refer to flexible disk drive hardware maintenance manual
and troubleshoot disk drive.
Remove hood (procedure 3) and check that ROM/EROM expansion chips are inserted in corresponding numbered sockets
on video board (figure 6-14). ~lso check that ROM SEL
switches on video board are set to reflect presence of
expansion chips (switch settings are shown on decal
inside hood).
Replace ROM/EROM expansion chips on video board
(procedure 8).
Replace video board (procedure 6) and controller board
(procedure 7) one at a time.
62940007
SAM 8-1
SAM 8 - PARALLEL INTERFACE PROBLEMS
Assumptions: Resident diagnostics ran without error, all
peripheral devices connected to PARALLEL interface are powered
on, and PLATO DIAG tests for peripheral device point to a
parallel interface problem.
001
N Y
Terminator installed on last device?
I
002
N Y
More than one device connected to PARALLEL interface?
I I
003
1 1
I I
I I
004
005
006
I 2
I
I
I
I
I
I
I
I
2
I I
I I
I I
007
008
I
I
I
I
I
I
3
Check that all cable connections between terminal and
device(s) are secure.
Try to isolate problem by disconnecting peripheral
devices one at a time and rerunning tests. Start
with last device in daisy chain and be sure to
reposition terminator on new last device. Refer to
applicable hardware maintenance manual if a peripheral
device is found to be at faul t.
Replace controller board (procedure 7).
Substitute a like peripheral device and rerun tests.
If
no error occurs, refer to applicable hardware maintenance manual and troubleshoot faulty peripheral device.
I 3 Replace controller board (procedure 7).
I
1 Install a terminator (part number 15632316) on last device
and rerun tests.
62940007
6-35/6-36
Procedure 1 - Turning Terminal On/Off
Apply power to terminal before powering on connected peripherals.
To apply power to terminal:
1. Verify that power cord is plugged into site outlet.
2. Press ON side of ON/OFF circuit breaker at lower-right
side of terminal.
3. Adjust BRIGHTNESS control for desired viewing intensity.
To remove power from the terminal:
1. Press OFF side of ON/OFF circuit breaker.
2. If making parts replacement, disconnect power cord from
site outlet.
Procedure 2 - Executing Resident Diagnostics
NOTE
This procedure assumes that internal
switch 52-8 is set in NO position, so
diagnostic tests do not loop. Also,
it assumes that internal switch 52-10
is set to 32K position if optional
RAM expansion is installed, or to 16K
position if expansion is not installed.
If set inaccurately, the
diagnostics will either omit the
expansion RAM or include nonexistent
RAM in the RAM test. The latter condition results in invalid errors.
To run resident diagnostics:
1. Set switches behind protective door as follows:
CAUTION
Do not use a "lead" pencil to set
rocker switches. Graphite dust from
the pencil can cause a switch
malfunction.
62940007
6-37
•
SKIP/TEST switch to TEST.
•
SKIP/KB&TP switch to KB&TP if crt alignment, keyboard,
and touchpanel tests are to be run with RAM and interface tests.
2. Press RESET switch for 3 seconds or longer to start tests
and verify that all operator-panel LEDs light while RESET
is pressed.
If controlware is loaded, RESET may have to
be pressed twice, each time for 3 seconds or longer
before tests start. RAM and interface tests then run as
follows:
•
If only these
detected, the
and a display
element lit.
ware from the
•
If an error is detected in either test, alarm sounds
and an error code is displayed in LEDs on operator
panel.
If this occurs, go to step 4.
•
If no error is detected in either test and all tests
are being run, an alignment pattern with two
intersecting-diagonal lines appears on screen and RCV
and XMT LEDs on operator panel light. Go to step 3.
two tests are run and no error is
LEDs on operator panel cycle on and off
briefly appears with every other matrix
Then terminal attempts to load controlselected load source.
3. With alignment pattern on screen, display adjustments can
be made, if necessary, and operation of touchpanel and
keyboard can be tested as follows.
If an error occurs,
refer to SAM 4 for corrective action.
•
Touching any of the 256 touch-sensitive areas on
touchpanel causes video to invert in that area of the
screen (go from black to illuminated or vice versa).
Repeated touches cause repeated inversions.
•
Pressing a keyboard key displays a binary representation of its hexadecimal code on the screen. Except
for the SHIFT and CTRL (Control) keys, each key
generates a shifted code (SHIFT key in use) and an
unshifted code (figure 6-3).
In addition, the shifted
and unshifted codes can be modified by use of the CTRL
key, which adds 8016 to the code value.
The displayed representation uses long bars for binary
Is and short bars for binary Os, with the bottom bar
being the lowest order bit. For example, the representation for the 5716 code of w is interpreted as
follows:
6-38
62940007
mmmmr:: ~~ ~LJmwm~~~~
21
22
23
24
25
26
27
28
29
7B
30
31
32
3B
UN~~~iED_oo
31'
2C
2E
01
71
02
77
03
65
04
72
05
74
06
79
07
75
08
69
09
6f
5B
70
10
33
II
34
12
35
IB
3C
OC
51
57
45
52
54
59
55
49
4f
50
13
14
15
IC
SHlfTED_
CODE
20
~~mmmQwwQwwl~~)~.~~
OE
*imQmQ~QQQQm~••~
2B
00
2A
OB
OA
Of
41
53
44
46
47
48
4A
7A
78
63
76
62
6E
5A
58
43
56
42
4E
60
4B
7f
4C
7E
5C
70
16
17
18
39
10
3A
40
5f
5E
50
19
IA
m~r~)mmm[JwQ[dCJDml~~~I~~
60
I~
40
02298-1
Figure 6-3.
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
•
Keyboard Codes and Legends
7- - I
6--- 1
51
4--- 1-31
2--- 1
1--- 1
0--- 1
=
010101112
=
5716
To end the crt alignment, touchpanel, and keyboard
tests, hold SHIFT key down and press STOP key. Terminal then attempts to load from the selected load
source.
4. If alarm sounds, do as follows:
a. Decode error code shown in LEDs.
Error
Code
RCV
XMT
ERR
Off
Lit
Off
Off
Off
Lit
Lit
Off
Lit
01
02
03
Lit
Off
Off
04
Lit
Off
Lit
05
--
62940007 B
Error codes are:
Type of Error
Memory error writing/reading 55 16 \
Memory error writing/reading AA16
Memory error due to addressing
problem
PLATO-communication logic error
ASCII-communication logic or SERIAL
interface error
6-39
b. Press any keyboard key to stop alarm. This also
causes a second indication to appear in LEDs. If
inital error code was 01 or 02, second indication
identifies RAM chip that was in error (figure 6-4).
If initial error code was 03, 04, or 05, refer to
table 6-1 for meaning of second indication. Then
refer to SAM 4 for corrective action.
TABLE 6-1.
SECOND INDICATIONS FOR ERRORS 03, 04, AND 05
x - LIT
I
1INITIAL DID R Rlx E
ERROR TIS T C M R
CODE
RRSVTR
MEANING OF SECOND INDICATION
(RECORD AND PASS THIS INFORMATION
ON WHEN RETURNING FAULTY MODULE)
03
- - - - Problem on A-OO, A-07, or PMA-O line.
03
- - - X Problem on A-Ol, A-OB, or PMA-l line.
03
- - - - X - Problem on A-02, A-09, or PMA-2 line.
03
- - X X Problem on A-03, A-IO, or PMA-3 line.
03
- X
Problem on A-04, A-II, or PMA-4 line.
03
- - - X - X Problem on A-05, A-12, or PMA-5 line.
03
- -1- X X - Problem on A-06, A-13, or PMA-6 line.
03
- X X X Problem on A-OO, A-07, or PMA-O line.
03
- X -
- Problem on A-OO, A-07, or PMA-O line.
03
- X -
X Problem on A-OI, A-OB, or PMA-I line.
03
1- X - - X - Problem on A-02, A-09, or PMA-2 line.
03
-Ix - - X X Problem on A-03, A-IO, or PMA-3 line.
03
-Ix - xl- - Problem on A-04, A-II, or PMA-4 line.
I
I
-Ix - XI- X Problem on A-05, A-12, or PMA-5 line.
03
03
r
I
I
I
r
1 1
03
-Ix - xix - Problem on A-06, A-13, or PMA-6 line.
I
I
-IX -IXlx X Problem on A-OO, A-07, or PMA-O line.
03
XI-i-\-\-I . . . Problem on A-OO, A-07, or DMA-5 line.
03
IXI-I-i-I-IXIProblem on A-OI, A-OS, or DMA-6 line.
I I I I J
1111111
6-40
62940001
TABLE 6-1.
I
INITIALID
ERROR T
CODE
R
SECOND INDICATIONS FOR ERRORS 03, 04, AND 05 (CONTD)
X =
DIR
SIT
RIS
LIT
Rlx E
clM R
VIT R
MEANING OF SECOND INDICATION
(RECORD AND PASS THIS INFORMATION
ON WHEN RETURNING FAULTY MODULE)
I
03
X - - -IX - Problem on A-02, A-IO, or DMA-O line.
03
X - - -Ix X Problem on A-03, A-II, or DMA-l line.
03
X - - X - - Problem on A-04, A-12, or DMA-2 line.
03
X - - X - X Problem on A-OS, A-13, or DMA-3 line.
03
X - - X X - Problem on A-06, A-14, or DMA-4 line.
03
X - - X X X Problem on A-OO, A-07, or DMA-S line.
03
X XI- - - - Problem on A-OO, A-07, or DMA-S line.
03
X XI- - - X Problem on A-Ol, A-08, or DMA-6 line.
03
X XI- - X - Problem on A-02, A-IO, or DMA-O line.
03
X XI- - X X Problem on A-03, A-II, or DMA-I line.
03
X xl- X - - Problem on A-04, A-12, or DMA-2 line.
03
X X - X - X Problem on A-OS, A-13, or DMA-3 line.
03
X X - X X - Problem on A-06, A-14, or DMA-4 line.
03
X X - X X X Problem on A-OO, A-07, or DMA-S line.
I
I
I
I
I
I
I
04
I
X No character-request status.
04
- X - Character request dropped after output of
lower bits.
04
- X X Character request present after output of
upper bits.
04
- X - - First byte flag not set.
04
- - - X - X Start bit not received.
04
- - - X X - No character-ready status.
04
- - - X X X Data error.
05
05
05
62940007
X No character-request status.
-1- - - X - No character-ready status.
I
I
-1- -1- X X Data Error.
6-41
nODDo.m
J0DODO000000-OlD
VIDEO BOARD
a
B'i 0 -
THRU -
fIT 7
(60ARNg~~KS
Ollllllll~ OOOOOOOO[lB'NKO
o11111111 00mo 000 I
RAM
~ 011111111 000~
00 0III
n Uu
u u UU
UU0
m~ 0000.000000000000 0
WwD~DoD DjlDjJllO 000000
0000000[j 1~~~:'o~ALI
fj 00000000 B.NK
U~ 0000000 B'NK
D,
2 .
3
BITO-THRU-BI~7(FOR BANKS
2AND 3)
FRONT PANEL
LEOS
DTR
DSR
O}
0
2'
BANl< 2°
r:8}.
ERR
Figure 6-4.
0
B'T
::
2°03.""
RAM Chip Location
Procedure 3 - Removing Hood and Bezel
To remove hood:
1. Remove two screws at rear of hood (figure 6-5). Lift
rear slightly and slide hood toward rear to remove.
2. To reinstall, do reverse of step 1.
NOTE
When reinstalling hood, be sure connector panel is in slot at rear of
hood
6-42
62940667
To remove bezel:
1. Remove power from terminal (procedure 1).
2. Lay terminal on its side and remove two screws at bottom
of terminal (figure 6-6).
3. Set terminal upright, and remove hood per preceding
instructions.
---.,
03497
Figure 6-5.
Figure 6-6.
62940007
Hood Removal
Bottom of Terminal
6-43
4. Refer to figure 6-7 and remove two bracket screws as
indicated.
5. Disconnect touchpanel and operator panel cables from AJ3
and AJ4 on controller board.
6. Release touchpanel and operator panel cables from clamps
on monitor chassis (no clamp for operator panel cable
will exist if internal modem is installed).
7. If internal modem is installed, cut cable tie securing
top of modem board to monitor chassis. Loosen top of
modem board from standoff retainer and remove operator
panel cable from behind modem board.
8. If adequate space is available, bezel can be removed and
placed to right of terminal while leaving BRIGHTNESS
control attached. If space is not available and bezel
must be removed completely, continue with the following
steps.
NOTE
Before bezel is replaced, it is suggested that face of crt be cleaned
with a suitable glass cleaning agent.
Figure 6-7.
6-44
Bracket Screws Removal
62940007
9. Remove knob from BRIGHTNESS control by pulling knob
straight off.
10. Remove nut and washer from front of BRIGHTNESS control.
11. Loosen touchpanel retainer clip below rear of BRIGHTNESS
control and carefully work control out around touchpanel. Retighten touchpanel retainer clip. When
replacing BRIGHTNESS control on international units, be
sure ground-wire lug is slipped over control bushing
before installing control in bezel opening.
12. Replace bezel by reversing procedure of preceding steps.
Procedure 4 - Adjusting Video
To adjust video:
1.
Power on terminal (procedure 1).
2.
Display resident-diagnostic alignment pattern by:
a. Placing SKIP/KB&TP switch to KB&TP.
b. Placing SKIP/TEST switch to TEST.
c. Pressing RESET switch for 3 seconds ?r longer: If
controlware is loaded, this may requlre presslng RESET
twice, each time for 3 seconds or longer.
3.
Adjust BRIGHTNESS control for sharpest video and carefully observe the alignment pattern for a symmetrical
display and correct alignment with touchpanel grid at
outer edge of screen.
NOTE
Allow a warm-up period of 15 to 30
minutes before performing adjustments.
Refer to table 6-2 for a listing of
all video controls and comments pertaining to their use.
The following adjustments are made through the VIDEO GAIN,
FOCUS, .H FREQ, VERTICAL FREQ, H SIZE, H LIN, V SIZE, and V LIN
controls on the monitor display board with the tools of the
alignment tool kit (part number 12263463). If the alignment
pattern is not centered after completing these adjustments,
adjust yoke centering rings (procedure 5) and then repeat these
adjustments. To do the adjustments, remove hood (procedure 3)
and refer to figure 6-8.
62940007 B
6-45
TABLE 6-2.
ADJUSTMENT
VIDEO ADJUSTMENT CONTROLS
AFFECTS
ALSO AFFECTS
PROCEDURE!
COMMENTS
I
I
____________~----------------_T--------------_T---------------II
Resolution if
adjusted too
far CCW.
Adjusted at
I
factory for
I
40ft L with alII
white display
using less than
50 V video.
FOCUS
Display element
Potentiometer I size and
crispness.
Corner elements
and center
elements
differently.
Adjust for best
resolution in
center of
display.
Yoke
Orientation
Raster tilt.
Raster size,
if not snug
against crt.
Rotate to correct raster.
Push up against
crt. Tighten
clamp to keep
in place.
Yoke Centering Rings
Location of
center of raster.
Geometry of
display when
moved more
than 0.2 inch.
Minimum affect
when ring tabs
are 180 0 apart.
Once rings are
in position,
glue with silicone adhesive
(part number
51004063).
H FREQ
(Horizontal
Frequency)
Potentiometer
Horizontal sync.
Center of raster and
linearity if
display area is
shifted off
center.
Not to be used
to position
display on raster or move
display
horizontally.
VERTICAL FREQ
(Frequency)
Potentiometer
Vertical sync.
Vertical
stability.
Adjust ccw
until just out
of sync, then
set 10 0 CWo
H (Horizontal) SIZE
Coil
Raster width,
high voltage,
and overall size.
Vertical size
because high
voltage is
affected.
Horizontal
size, horizontal linearity,
and centering
rings all
interact.
VIDEO GAIN
Potentiometer
6-46
Maximum brightness
before background
raster appears.
62940007 B
TABLE 6-2.
I
I
I
I
H LIN
I
(Horizontal I
Linearity)
I
Coil
I
I
I
I
V (Vertical) I
SIZE Poten- I
Potentiometer
ADJUSTMENT
VIDEO ADJUSTMENT CONTROLS (CONTD)
AFFECTS
ALSO AFFECTS
Size ratio of
left half to right
half.
Overall width
and high
voltage.
PROCEDURE!
COMMENTS
Adjust so that
center-to-left
and center-toright measurements are
equal.
Vertical size,
vertical linearity, and
centering rings
all interact.
Raster height.
V LIN
(Vertical
Linearity)
Potentiometer
Size ratio of
top half to
bottom half.
Overall height.
Adjust so that
center-to-top
and center-tobottom measurements are
equal.
High Voltage
Limit
Potentiometer
Limits high
voltage to
19 kV max.
X-ray emission.
Set with a
variable power
supply and high
voltage meter
by repair
center personnel or by
vendor.
WARNING
Lethal voltages exist in the crt
monitor assembly. Use extreme caution when performing adjustments or
severe personal or loss of life may
resul t.
NOTE
The term saturation in the next step
refers to an overshoot or widening of
the alignment pattern on the right
side of the screen.
4. Turn VIDEO GAIN control counterclockwise until saturation
just occurs, then turn control 30 degrees clockwise.
62940007
6-47
Figure 6-8.
Display Board
5. Adjust FOCUS control for best resolution in center of
display.
6. Adjust horizontal frequency as follows:
a. Disable Horizontal Sync signal by grounding side of
resistor R3 closest to capacitor CI (figure 6-8).
b. Adjust H FREQ control so vertical lines of alignment
pattern are as vertical as possible.
It is acceptable
that display be unstable with some jittering and
rolling in horizontal direction.
NOTE
The H FREQ control must not be used to
position the display on the raster or
to move the display horizontally.
c. Unground resistor R3.
6-48
62940007
7. Turn VERT FREQ control counterclockwise until display
just starts to roll, then turn control 10 degrees
clockwise.
8. Adjust H SIZE control for an overall pattern width of
216 mm (8.5 in). Use plastic ruler or a piece of
8-l/2-by-ll-inch paper for measuring.
9. Adjust H LIN control until pattern is horizontally
centered on screen.
10. Adjust V SIZE control for an overall pattern height of
216 mm (8.5 in).
11. Adjust V LIN control until pattern is vertically centered
on screen.
Procedure 5 - Adjusting Yoke Centering Rings
NOTE
Perform this procedure only after procedure 4 has been completed.
If the display is not centered after completing procedure 4, refer
to figure 6-9 and do as follows:
YOKE ASSEMBLY
!;..::~---:r- CENTERING
RING TABS
02323-1
Figure 6-9.
CRT Centering Rings
1. Remove power from terminal (procedure 1) and wait 60 seconds for crt to bleed off power.
2. Ensure that yoke is snug against crt and that yoke clamp
is tight.
62940007
6-49
3. Break glue on centering rings by turning each approximately one-quarter turn each way.
4. Leave SKIP/TEST and SKIP/KB&TP switches in TEST and KB&TP
positions and power on terminal.
WARNING
Lethal voltages exist in the crt
monitor assembly. Use extreme caution when performing adjustments or
severe personal injury or loss of
life may result.
5. Adjust centering rings until alignment pattern is centered.
Distance between each side and center should be
108 mm (4.25 in).
6. After pattern is centered:
a. Power off terminal and disconnect power cord from site
outlet.
b. Wait 60 seconds for crt to bleed off power.
c. Reglue centering rings with silicone adhesive (part
number 5l004063).
d. Reapply power and verify that centering rings did not
move while being glued.
7. Repeat procedure 4.
Procedure 6 - Replacing Video Board
To replace the video board:
CAUTION
The video board contains MOS integrated circuits. Follow the precautionary rules for handling MOS circuits
given earlier in this section.
1. Remove power from terminal (procedure I).
2. Remove terminal hood (procedure 3).
6-50
62940007
3. Disconnect cables from video board (figure 6-10) taking
care not to bend pins.
4. Unlock board from two retainer clips by compressing each
retainer between thumb and forefinger while gently
pulling on board. Pull board out free from retainers and
remove board.
5. If optional RAM expansion and/or ROM/EROM expansion chips
are installed on board (figure 6-11), remove optional
chips from that board and install in same locations on
replacement board. Do this as follows:
a. Use chip removal tool (part number 87365900) for RAM
chips or small screwdriver for ROM/EROM chips and lift
chips straight out to avoid bending pins.
b. Insert chips so that dot or indentation is aligned
with notch of sockets.
VIDEO BOARD
0341"-1
Figure 6-10.
62940007
Video and Controller Board Locations
6-51
FLOOD SCREEN SWITCH
LOCATIONS FOR OPTIONAL
ROM/EROM EXPANSION
CHIPS CONTAINING
RESIDENT CONTROLWARE PROGRAM
RED STRIPE
REFRESH-MEMORY~
WRITE SWITCH
l
TO MONITOR
_ _- - - - - DISPLAY BOARD
(KEYED FOR CORRECT
CONNECTION)
'\
IIII O~
(J)l~~ 0DOD DOD 0~D1rTI
~DDDDDDD
uB111111
0 00000
000
~DDDDDD~
FROM POWERSUPPLY BOARD_ _ _
(KEYED FOR CORRECT
CONNECTION)
0
~~~~~~~DD ~~~~~~~
LOCATIONS FOR
NAL RAM
EXPANSION CHIPS
0000000
DillDoO 0
Figure 6-11.
TO VIDEO OUT
CONNECTOR
03911-3
Video Board
6. Set ROM SEL switches on replacement board to same
settings as on old board.
7. Place replacement board over retainer clips and press to
snap into position.
8. Reconnect cables to board.
cable connections.
Refer to figure 6-11 for
9. Apply power and run resident diagnostics (procedure 2) to
check operation of new board.
10. If optional ROM/EROM is present, verify proper loading
from ROM/EROM per startup instructions in terminal
operator's guide (refer to preface for publication
number) •
Procedure 7 - Replacing Controller Board
To replace controller board:
CAUTION
The controller board contains MOS
integrated circuits. Follow the precautionary rules for handling MOS circuits given earlier in this section.
6-52
62940007 B
1. Remove power from terminal (procedure 1).
2. Remove terminal hood (procedure 3).
3. Loosen retaining screws on connectors and disconnect
external I/O cables from connector panel at rear of
controller board (figure 6-10).
4. Disconnect internal cables from controller board taking
care not to bend pins.
5. Unlock board from two retainer clips by compressing each
retainer between thumb and forefinger while gently
pulling on board. Pull board out free from retainers.
6. Disconnect board ground lead from connector plate
7. Connect ground lead to connector plate on replacement
board.
8. Place replacement board over retainer clips and press to
snap into position.
9. Reconnect internal cables to board.
for cable connections.
Refer to figure 6-12
10. Reconnect I/O cables to board connector panel and tighten
retaining screws on connectors.
11. Set S2 and S5 switches on board to same settings as on
old board.
12. Verify that Communication Loopback switch on board is set
to NORM position.
13. Apply power and run resident diagnostics (procedure 2) to
check operation of new board.
62940007 B
6-53
7
TO OPERATOR PANEL
(KEYED FOR CORRECT
CONNECTION)
TO KEYBOARD - - - - .
(KEYED FOR CORRECT
\
CONNECTION)
SINGLE BLACK DOT ON OUTER
CONNECTOR, TWO BLACK DOTS
ON
NER CONNECTOR
COMMUNICATION
~OPBACK SWITCH
.....---.",~-..,.
TO OPTIONAL
INTERNAL MODEM
[RED STRIPE
BOARD~
II
.-..--
II
1
\
1
\
_TO VIDEO
BOARD
)
03943-2
Figure 6-12.
Controller Board
Procedure 8 - Replacing Integrated-Circuit Chips
The folLowing instructions cover the replacement of the
pluggable chips on the terminal, which are:
•
Z80A Processor chip on controller board (figure 6-13)
•
Z80A-SIO/2 Communications Controller chip on controller
board (figure 6-13).
•
All RAM chips on video board (figure 6-14)
6-54
62940007 B
•
ROM/EROM chip on video board containing resident firmware
program (figure 6-l4)
•
Optional ROM/EROM expansion chips on video board
containing resident controlware program (figure 6-l4)
•
74S05 chip on monitor display board (figure 6-l5)
CAUTION
Follow the precautionary rules for
handling MOS circuits given earlier
in this section when replacing chips.
1. Remove power from terminal (procedure I) and remove hood
(procedure 3).
2. If replacing other than.74S05 chip on monitor display
board, remove video board (procedure 6) or controller
board (procedure 7) as applicable.
3. Use chip removal tool (part number 87365900) for l4-pin
and l6-pin chips, or a small screwdriver for larger chips
and lift chip(s) straight out to avoid bending pins.
4. Insert replacement chip(s) so that dot or indentation is
aligned with notch of corresponding socket(s).
5. If removed, reinstall video board (procedure 6) or
controller board (procedure 7).
6. Apply power and run resident diagnostics (procedure 2) to
check operation of terminal.
62940007 B
6-55
1111111
1111111111111 J-------;:I...---;l!::;:;:;:;::::::;::~
Z80A-SIO/2
COMMUNICATIONS
CONTROLLER
]
Z80A PROCESSOR
C,--_~7
C\.-_-...J7
03943
Figure 6-13.
6-56
Pluggable Chips on Controller Board
62940007
ROM 3 SOCKETl
ROM 4 SOCKETl-
66
[ROM 2 SOCKET
~ ROM I SOCKET
nDDQo6OJ6u ~LJ
LOCATIONS FOR OPTIONAL ROM/EROM
CONTAINING RESIDENT CONTROLWARE
PROGRAM. EACH CHIP IS MARKED WITH
a
I / ~~~:i:o~~tNTG'~~~Ti~h~WS
(l\lJ ~ ~ 000000000-D1rTI
BI,O -
THRU -
r'T 7
(~OtN~~~KS
~g~I~N~~~IIIIIII~ ODDOOODD[] BANKO
~~:;A~J
~ I I II II I 00Um 0n0 I 00000 000[L~~~fo~ALI
RAM
~Dnllllllggg!lJbfl
O~ 01IIIIIIIIu uu UU UU0
mOOarD
ill
0000000000000000 0
DilDoD DJLDlJll 0000000
Figure 6-14.
Figure 6-15.
62940007 B
llDDDDDDOO BANK'
U~ 0000000 BANK
3
BITO-THRU-BI~7(FOR BANKS
2
A::91:~4
Pluggable Chips on Video Board
Pluggable Chip on Monitor Display Board
6-57
Procedure 9 - Checking and Adjusting Power Supply Voltases
To check/adjust power supply voltages, do the following.
If any
voltages are found bad, refer to SAM 3 for corrective action.
1. Remove terminal hood (procedure 3).
2. With power applied, adjust +5 V output as follows:
a. Measure for +5 V across capacitor C78 on controller
board (figure 6-16).
b. Insert adjustment tool of alignment tool kit (part
number 12263463) through +5-V access hole in monitor
chassis (figure 6-17).
NOTE
If the +5 V output rises to between
+5.5 to +6.8 V, that and all other
power supply outputs except +55 V will
automatically shut off.
c. Adjust potentiometer on power supply board for a +5 V
reading (+5+0.25 V is maximum allowable tolerance).
f
,
f
II
I
f
C7a
.
I
1- GROUND
II
j
W-GROUNO
-C79
--12 V
\
I
\,-____1
\
)
039"3
Figure 6-16.
6-58
Test Points for +5 V and -12 V on Controller Board
62940007
ADJUSTMENT
TOOL
-12-V LED
-5-V LED
+12-V
LED------~~--~~----~~-
+5-V LEO _ _
03460-3
--~~---;;,---i~~__:;
+55-V ADJUSTMENT
+55-V LEO
Figure 6-17.
Power Supply Board Adjustments
WARNING
Lethal voltages exist in the crt
monitor assembly. Use extreme caution when performing adjustments or
severe personal injury or loss of
life may result.
3. Adjust +55 V output:
a. Measure for +55 V at fuse on monitor display board.
For ground, use ground side of capacitor C35 (figure
6-18).
b. Insert adjustment tool through +55-V access hole in
monitor chassis.
c. Adjust potentiometer on power supply board for a +55 V
reading (+55 +1.10 V is maximum allowable tolerance).
62940007
6-59
+55 V
03500-3
Figure 6-18.
Test Points for +55 V on Display Board
4. Check thst the following nonadjustable voltages are
present:
6-60
•
-12 +0.60 V across capacitor C79 on controller board
(figure 6-16)
.
•
-5 +0.25 V across capacitor C83 on video board
(figure 6-19
•
+12 +0.60 V across capacitor C66 on video board
(figure 6-19)
62940007
GROUNO~ nOD QDilm _ a
i 9~O oDD 00D0ODD ~D ~01rTI
000000000 D DDDDD
+
I 000000000DOOm 000
~ 000000000ODD DD D
8 nn00000000ODD DDDD00
---r~U D00DOD DDOD DOD DO 00
-5v~O)DllOCJoO OlJ,DJIllO 000000
2J
vJ']
C66
12
GROUND
C8 3
Figure 6-19.
03911- 5
Test Points for -5 V and +12 V on Video Board
Procedure 10 - Replacing Power Supply Board
To replace the power supply board:
1. Turn power off (procedure 1) and disconnect power cord
from site outlet.
2. Remove terminal hood (procedure 3).
3. Disconnect the following cables:
•
Keyboard cable from AJ2 on controller board (figure 6-12).
•
Touchpanel cables from AJ3 on controller board (figure 6-12).
•
Operator panel cable from AJ4 on controller board
(figure 6-12).
•
Board-edge connector from monitor display board.
62940007
6-61
4. If installed, remove internal modem board from monitor
chassis (procedure 21).
CAUTION
When removing and installing monitor
chassis, use care so that neck of
crt does not bump video board. Tilt
chassis so that neck is down, and do
not handle crt by its neck. Also
when installing chassis, use care to
prevent pinching touchpanel cables.
5. Remove six mounting screws (figure 6-20) and carefully
lift monitor chassis and place on a firm surface.
6. Disconnect three cables from power supply board.
7. Remove power-supply-board ground wire from ac entry panel.
8. Remove six mounting screws (figure 6-21) and remove power
supply board.
Figure 6-20.
6-62
Monitor Chassis Removal
62940007
Figure 6-21.
Power Supply Board kemoval
9. Install replacement power supply board in reverse procedure of preceding steps and set 50/60-Hz switch on
replacement board to appropriate position (60-Hz position
for a domestic unit: 50-Hz position for an international
unit). After installation, check and adjust power supply
voltages (procedure 9).
Procedure 11 - Replacing Line Filter, Power-Cord Receptacle, and
Stepdown Transformer
To replace line filter or power-cord receptacle:
1. Power off terminal (procedure 1).
2. Unplug power cord from site outlet and from receptacle on
ac entry panel.
3. Remove terminal hood (procedure 3).
62940007
6-63
4. If present, disconnect external cables from PHONE, LINE,
and VIDEO OUT connectors on ac entry panel.
5. Disconnect two slide-on connectors from LOAD side of line
filter (figure 6-22).
6. Disconnect cable from video board that goes to VIDEO OUT
connector.
7. Remove all ground wires from ground terminals on ac entry
panel except the one going to power cord receptacle.
8. Remove two screws that mount ac entry panel to terminal
base (figure 6-22).
AC ENTRY COVER PLATE
(PRESENT IF THERE IS
NO INTERNAL MODEM)
INTERNAL
MODEM
BOARD
POWER-CORD
RECEPTACLE
GROUND SPRING
BROWN WIRE.-/
BLUE
03941-3
6-64
WIRE~
Figure 6-22.
PC BOARD WITH
TELEPHONE JACKS
AC Entry Panel Removal
62940007 B
9. If internal modern is present, raise entry panel and
remove two screws and lockwashers securing telephone-jack
PC board to panel. Then remove ac entry panel from unit.
10. Remove two screws securing line filter to panel.
Then
disconnect remaining slide-on connectors when filter is
free.
11. If replacing power-cord receptacle, remove receptacle
ground wire from panel.
Then remove two screws securing
receptacle.
12. Install replacement filter or receptacle in reverse procedure of preceding steps. When connecting slide-on connectors to filter, make sure that brown wires are
installed on top terminals and blue wires on bottom terminals.
If internal modem is present, also be sure that
ground springs on telephone-jack board are firmly against
hood-mounting post in base when securing ac entry panel.
To replace stepdown transformer (applicable only to international units):
1. Power off terminal (procedure 1) and unplug power cord
from site outlet.
2. Remove terminal hood and bezel (procedure 3).
3. Remove monitor chassis per procedure 10, steps 3 thru 5.
4. Disconnect from ON/OFF circuit breaker two slide-on connectors corning from transformer.
5. Disconnect transformer connector from Jl on power supply
board and remove connector ground wire from ac entry
panel.
6. Disconnect transformer ground wire from ac entry panel.
7. Remove four mounting screws and lift transformer from
unit (figure 6-23).
8. To install replacement transformer, perform reverse of
preceding steps.
62940007 B
6-65
Figure 6-23.
Stepdown Transformer Removal (Applicable Only to
International Units)
Procedure 12 - Replacing ON/OFF Circuit Breaker
To replace ON/OFF circuit breaker:
1. Power off terminal (procedure 1) and unplug power cord
from site outlet.
2. Remove terminal hood and bezel (procedure 3).
3. Squeeze four side clips and remove circuit breaker out
opening (figure 6-24).
4. Disconnect four slide-on connectors from circuit breaker.
5. Refer to figure 6-24 and connect slide-on connectors to
replacement breaker. Make sure connections are correct.
6-66
62940007
6. Position breaker so both terminals marked LINE are toward
front of unit, then press into opening until side clips
engage.
7. Replace bezel and hood (procedure 3).
TO POWER SUPPLY BOARD
(DOMESTIC UNIT)
OR
TO STEPDOWN TRANSFORMER
(INTERNATIONAL UNIT)
CIRCUIT
BREAKER
(REAR VIEW)
SIDE CLIPS
(TWO ON EACH SIDE)
03940
Figure 6-24.
ON/OFF Circuit Breaker Replacement
Procedure 13 - Replacing Keyboard Assembly and
Com~onents
To replace the keycaps, spacebar, keyboard, or keyswitches, perform the following steps as applicable:
To replace a keycap or spacebar:
1. Turn terminal power off (procedure 1).
2. Remove keycap or spacebar using chip removal tool (part
number 87365900).
3. Install new keycap or spacebar and press down until
firmly seated.
62940007
6-67
To replace keyboard:
1. Turn terminal power off (procedure l) and disconnect
power cord from site outlet.
2. Remove terminal hood and bezel (procedure 3).
3. Disconnect keyboard cable from AJ2 on controller board.
4. Remove four screws mounting keyboard assembly to terminal
base (figure 6-25).
5. Install new keyboard assembly by reversing preceding
steps.
NOTE
Check that bezel does not bind key
caps on top or sides before tightening down.
If binding occurs, remove
bezel, loosen keyboard and reposit ion s1 igh tly •
03506-2
Figure 6-25.
6-68
Keyboard Assembly Removal
62940007 B
To replace a keyswitch (including Spacebar keyswitch), refer to
figure 6-26 and do the following:
1. Turn terminal power off (procedure 1) and remove keyboard
assembly as previously described in this procedure.
2. Remove keycap as described earlier in this procedure.
CAUTION
Use a low wattage soldering iron to
avoid damaging PC board. A vacuum
action desoldering tool or solder
wick is suggested when unsoldering
the switch.
3. Unsolder the contacts of switch and push on thickest contact to dislodge switch assembly from PC board and keyboard housing. Once switch assembly is free, pull it
from housing.
4. Position replacement switch assembly so its contacts are
aligned in same way as old switch.
5. Press replacement switch assembly down into opening of
keyboard housing until it bottoms. Make sure contacts
are exposed on back of PC board.
6. Solder each contact to PC board.
7. Replace keycap and reinstall keyboard.
CONTACTS (2)
Figure 6-26.
62940007
03632
Keyswitch Replacement
6-69
Procedure 14 - Replacing Operator Panel
To replace operator panel:
1. Power off terminal (procedure 1) and disconnect power
cord from site outlet.
2. Remove hood and bezel (procedure 3).
3. Remove touchpanel (procedure 20).
4. Remove screw holding alarm (figure 6-27).
5. Remove three screws holding operator panel.
6. To replace operator panel, perform reverse of preceding
steps and set selection switches on replacement panel to
same settings as on old panel.
REMOVE
THREE
SCREWS
~--r----.-.-------------->"'"
\EIIOVE ALARM SCREW
03508-1
Figure 6-27.
6-70
Operator Panel Removal
62940007
Procedure 15 - Replacing Operator Panel LEDs
To replace an LED on operator panel:
1. Turn terminal power off (procedure 1) and disconnect
power cord from site outlet.
2. Remove operator panel (procedure 14).
CAUTION
Use a low wattage soldering iron to
avoid damaging PC board. A vacuum
action desoldering tool or solder
wick is suggested when unsoldering
the LED.
3. Unsolder two leads of faulty LED and remove LED from
board.
4. Install replacement LED so that flat side is oriented the
same as other LEDs (figure 6-28). If replacing CRI (ERR
LED), leave the space shown in figure 6-28 between base
of LED and surface of board. For other LEDs, butt base
of LED against board.
5. Solder each lead to board.
6. Reinstall operator panel (procedure 14).
XMT
DSR
~______________~PCBOARO
o IBBBBBBBBBBI
o
==
r---------,
I
I
o
ERR LED MOUNTED
rW1TH SHOWN SPACE
2.54 mm (0.10 in)....,
r{('.,-
~--OTHER
LEOs MOUNTED FLUSH
03509-2
Figure 6-28.
62940007
LEDs on Operator Panel
6-71
Procedure 16 - Replacing BRIGHTNESS Control
To replace BRIGHTNESS control:
1. Power off terminal (procedure 1) and disconnect power
cord from site outlet.
2. Remove hood and bezel per procedure 3, steps 1 through 8.
3. Pull BRIGHTNESS knob off and remove nut and washer from
front of BRIGHTNESS control.
4. Loosen touchpanel mounting clip below rear of BRIGHTNESS
control and move clip to one side.
5. Remove BRIGHTNESS control by carefully working it around
touchpanel and touchpanel mounting clip.
6. Slide pieces of clear sleeving back to expose lugs on
control.
CAUTION
Use a low wattage soldering iron. A
vacuum action desoldering tool or
solder wick is suggested to unsolder
wires from control.
7. Place replacement control next to bad one. Unsolder
wires one at a time and resolder to corresponding lugs on
replacement control.
8. Slide pieces of sleeving over lugs.
9. If an international unit, slip ground-wire lug over
control bushing.
10. Carefully install control in bezel opening by working it
around touchpanel.
11. Reposition touchpanel mounting clip and tighten.
12. Attach nut and washer to front of control.
13. Attach BRIGHTNESS knob and replace bezel and hood per
procedure 3.
6-72
62940007 B
Procedure 17 - Replacing Protective Door
To
replac~
protective door on operator panel:
1. Power off terminal (procedure 1).
2. Remove hood and bezel (procedure 3).
3. Remove black bezel insert by breaking two metal keepers
that hold both bezel pieces together.
4. Insert new door and fasten both bezel pieces back
together using two new keepers.
5. Reinstall bezel and hood (procedure 3).
Procedure 18 - Replacing Matched Yoke/CRT or Diselay Board
To replace matched yoke/crt or display board:
1. Power off terminal (procedure 1) and disconnect power
cord from site outlet.
2. Remove terminal hood (procedure 3).
3. Disconnect touchpanel, operator panel, and keyboard
cables from controller board (figure 6-12).
4. Disconnect board-edge connector from display board.
5. If installed, remove internal modem board from monitor
chassis (procedure 21).
CAUTION
When removing and installing monitor
chassis, use care so that crt neck
is not bumped against video board.
Tilt the chassis so that neck is
down, and do not handle crt by its
neck. Also when installing chassis,
use care to prevent pinching touchpanel cables.
62940007
6-73
6. Remove six screws shown in figure 6-29 and carefully lift
chassis out of terminal. Set on firm surface to work on.
WARNING
Use care when handling crt as rough
handling, nicks, or scratches can
cause crt to implode. Wear heavy
gloves and safety goggles.
7. Refer to figure 6-29 and disconnect the following:
•
•
•
Socket from end of crt.
Yoke cable from S02 on display board.
If removing yoke/crt, also disconnect anode lead from
crt (fold back suction cup on two sides and squeeze to
remove) •
1',
~m ~~~REMOVE
~. , '~"'\-ANODE
..
/
DOU~:::/~\~\-s--f1111T-1~
BLEEDER
ASSEMBLY
DISPLAY BOARD
CONNECTOR
Figure 6-29.
6-74
CRT Removal
62940007
To remove yoke/crt:
8. Remove four screws at front of chassis (figure 6-30) and
lift crt up and out.
9. Install replacement yoke/crt per reverse of preceding
steps, and after installation, perform video adjustments
(procedure 4).
REMOVE
REMOVE
05$10-1
Figure 6-30.
Front Chassis View
To remove display board:
10. Disconnect f1yback-transformer lead and white wire of crt
socket from doubler/bleeder assembly.
11. Remove two screws and remove board.
12. Install replacement board per reverse of preceding
steps. When replacing board, align tongue on board with
slot on chassis. After installation, perform video
adjustments (procedure 4).
62940007
6-75
Procedure 19 - Replacing Voltage Doubler/Bleeder Assembly
To replace the voltage doubler/bleeder assembly, refer to figure 6-29 and do the following:
1. Turn terminal power off (procedure 1) and disconnect
power cord from site outlet.
2. Remove hood (procedure 3).
WARNING
Lethal voltages exist in the leads
of the doubler/bleeder assembly.
After turning off power, a period of
60 seconds is required for these
voltages to bleed off.
3. Disconnect anode lead from crt (to remove, fold back suction cup and squeeze).
4. Disconnect input lead from flyback transformer.
5. Remove doubler/bleeder assembly by loosening bottom
mounting screw and removing top screw.
If proper length
screwdriver is not available, remove yoke/crt (procedure 18) to access screws.
6. Replace assembly by reversing preceding steps. Be sure
to attach white wire of crt socket and black wire of
assembly to top mounting screw.
Procedure 20 - Replacing Touchpanel
To replace the touchpanel:
1. Turn terminal power off (procedure 1) and disconnect
power cord from site outlet.
2. Remove terminal hood and bezel (procedure 3).
3. Remove touchpanel from bezel by loosening four mountingbracket screws (figure 6-31).
6-76
62940007
LOOSEN
,
J.>----nl 1
""
"
i.J
!
1
,,
:'
r---
~!
,,
,
,
.,
:o!
1
I
1
•••
,,
1
1
1
,
1
i,
1
I1
1
,,
1
I·
1
LOOSEN
03512-1
Figure 6-31.
Touchpanel Removal
To install replacement touchpanel:
4. Place touchpanel in bezel opening with ribbon cable at
top.
5. Align touchpanel so that etched alignment marks on panel
(figure 6-32) are lined up with marks on bezel. Alignment marks on bezel are hard to see. Use a lead pencil
to highlight them.
6. Carefully tighten four brackets while holding touchpanel
to bezel. Check that touchpanel remains correctly
aligned.
7. Check front of touchpanel for dimples in mylar. Any
dimples caused by tightening touchpanel down too tight
may cause errors and requires loosening.
62940007
6-77
8. Reinstall bezel (procedure 3).
9. Connect touchpanel connectors to controller board (figure 6-12).
10. Reconnect power cord and turn power on.
11. Run resident diagnostics (procedure 2) and test touchpanel operation when alignment pattern appears. Also
check that border of alignment pattern coincides with
touchpanel grid. If misalignment exists, perform video
adjustments (procedure 4).
12. Place defective touchpanel in shipping carton which held
replacement (figure 6-32).
13. Replace hood (procedure 3).
TOUCHPANEL
SHIPPING
CA
TYPICAL
CROSS SECTION
OF PANEL IN
CARTON
ALIGNMENT
MARKS (10)
02319-2
Figure 6-32.
6-78
Touchpanel Alignment Marks
62940007
Procedure 21 - Replacing Internal Modem Board
To replace internal modem board:
1. Power off terminal (procedure 1) and disconnect power
cord from site outlet.
2. Remove hood (procedure 3).
3. Disconnect wires from terminals on modem board.
4. Disconnect modem cable from controller board (figure 6-12).
5. Remove modem board by cutting cable ties and pulling
board off retainers.
6. Install new modem board by pressing board over retainers
and installing new cable ties (part number 94277400).
7. Refer to labeling and reconnect wires to J2, J3, and J5
terminals on modem board.
8. Connect ground wire to board GND terminal.
9. Reconnect modem cable to controller board (figure 6-12).
10. Replace hood (procedure 3).
Procedure 22 - Defining Acceptable Display Quality
The following information is for reference whenever definitions
of acceptable display quality are required.
Brightness - the retrace and nonintensified scan lines should
not be visible. The intensity should be set high enough for a
display to be seen from at least 1 meter (3 feet) away, but not
so high that displayed data changes in size and symbols appear
defocused.
Focus - focus is to be adjusted for best resolution in the
center of the screen.
62940007
6-79
Orthogonality and Linearity - with the resident-diagnostic
alignment pattern displayed (figure 6-33), the pattern should
appear square and coincide with the outer edges of the touchpanel grid. The point where the diagonals intersect should be
an equal distance from each edge of the square. If the pattern
does not meet these requirements, perform procedures 4 and 5.
03633
Figure 6-33.
6-80
Orthogonality and Linearity of Alignment Pattern
62940007
INDEX
Page
Procedure
Page
Procedure
Page
6-37
6-37
6-42
6-45
6-49
6-50
6-52
6-54
9
10
11
12
13
14
15
16
6-58
6-61
6-63
6-66
6-67
6-70
6-71
6-72
17
18
19
20
21
22
6-73
6-73
6-76
6-76
6-79
6-79
Figure
Page
Figure
Page
Figure
Page
6-1
6-2
6-3
6-4
6-5
6-6
6-7
6-8
6-9
6-10
6-11
6-12
6-9
6-10
6-39
6-42
6-43
6-43
6-44
6-48
6-49
6-51
6-52
6-54
6-13
6-14
6-15
6-16
6-17
6-18
6-19
6-20
6-21
6-22
6-23
6-24
6-56
6-57
6-57
6-58
6-59
6-60
6-61
6-62
6-63
6-64
6-66
6-67
6-25
6-26
6-27
6-28
6-29
6-30
6-31
6-32
6-33
6-68
6-69
6-70
6-71
6-74
6-75
6-77
6-78
6-79
Table
Page
6-1
6-4tl
6-46
Procedure
1
2
3
4
5
6
7
8
6-2
62940007
6-81
PARTS DATA
7
This section contains parts data information for the terminal.
This includes a genealogy chart, spare parts lists, and assembly
drawings with assembly parts lists.
TABLE 7-1.
COLUMN HEADING
EXPLANATION OF COLUMN HEADINGS OF COMPUTERGENERATED ASSEMBLY PARTS LISTS
EXPLANATION
FIND NO.
Identifies an electrical or mechanical parton an assembly drawing. If more than
one listing appears for a find number, refer to LI, WK IN, and WK OUT.
LI (Line Item)
Gives a chronological or historical record of the addition of a new part to a find
number. For example, 01 indicates that the part was the first one used, and 02
indicates the second, etc. See also WK IN and WK OUT.
PART NUMBER
Gives the Control Data Corporation part identification. Use this number when
ordering replacements.
CD (Check Digit)
Gives the information-control system a means of cross-checking the correctness of
a part number.
QUANTITY
Lists the total number of a part required to complete an assembly. The vertical
line near the center of the column acts as a decimal point. Numbers to the left of
the line are whole numbers. Those to the right of the line are tenths, hundredths,
and thousandths.
U!M (Unit of Measure)
Indicates how the information-control system counts or supplies a part.
1.
PART DESCRIPTION
Describes the physical appearance, type, or name of a part.
MC (Material Code)
Supplies additional descriptive data to the information-control system.
YLD (Yield)
A 2-digit number that indicates the usable portion of any quantity of parts
expressed as a percentage.
ECO NO. IN
Engineering Change Order that adds a new part to an assembly. See also WK IN.
ECO NO. OUT
Engineering Change Order that deletes a part from an assembly. See also WK OUT.
SIN (Serial Number)
Used to specify an ECO's effectivity by serial number.
WK IN (Week In)
Lists the date when manufacturing begins using a new part and when it is available
for parts replacement. For example, 7222 mea.'1S a part is available of the 22nd
week of 1972.
WK OUT (Week Out)
Lists the date when manufacturing no longer uses a part in building an assembly.
See also WK IN. Do not order a part after its week-out date.
0845-2t.
62940007
7-1/7-2
3
4
't
2
0'1
N
\0
~
o
o
o
-...J
CABLE ASSY
tJ
EC
CABLE ASSY DATA SET.
c
50 HZ ONLY (CC629--B)
CABLE ASSY (POIER CONN)61408969
CABLE ASSY (VIDEO OUTPUT)6140B444
CABLE ASSY
CABLE ASSY (0 I SPLAY LOG! C). .
CABLE ASSY (LOGIC SIGNALS).
CABLE ASSY (D.C. POWER).
CABLE ASSY (A.C. INPUT).
CABLE ASSY (A.C. ENTRy)..
A. C. POWER CORD.
. .. 61408901
.6140B025
.6140B024
..SEE TABLE
.SEE TABLE
. SEE TABLE
REFERENCE DOCUMENTS
CC62D-A.8 FIRMWARE ERS ..............
CC62D-A.8 ENGINEERING SPEC..
.. ...
LOGIC SET ......
..
OPERATORS IlJIDE. ......
.. ....
HARDWARE MAINTENANCE MAttJAL
(S ITE AND SUPPIlRT) .
SPARE PARTS LISTS:
XA244-A TOUCH PANEL.....
..
XA247-B MODEM OPTION
XA243-A MEMORY EXPANSION
XA281-A TIMESHARE ROM.
CC629-A. B ASCII 1ST-II.
DESIGN VERIFICATION TEST PLAN'.
REPORT
PRODUCT VERIFICATION TEST PLAN
REPORT
CONTROLWARE:
ASCII 'PLATO ERS
ASC II.'GRAPH I CS ERS
ASC II ITI MESH ARE ERS
PLATO ERS
OPTI ONS
CONTROLWARE (OOWNLINE LOADED)
MF401 -J I S7-111 ASC II CONTROLWARE.. ...15632600
B
MF402-J 1ST-III PLATO CONTROLWARE.
..15632603
40003-200 MEMORY EX PANS I ON OPT! ON
........... 66306B47
(XA243-A MEMORY EXPANSION OPTION 15632060)
40003-201 MODEM.
66306848
(XA247-B PLATO COMM NETWORK MODEM 15632424)
40003-220 TIMESHARE ROM.
61313034
(XA281-A TIMESHARE ROM OPTION 1563258T)
799-11 MODEM CA8LE
61313986
(YA254-A MODEM CABLE 15632602)
UHlW OTItlllWISE SPIClfltD
DIMEMSIONS AlliN INOIES
IQUIANCES
A
-...J
I
w
•
16042811
16042866
62201052
62040006
62940007
66308094
66313919
66308096
66313918
66312053
66312365
66312366
16042B72
16042873
'"042874
16042843
TITLE
GENEALOGY
2 "ACt
1ST - ill 50 E 60
'-i
L
DRAWING
NO
OWN
"
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rHKO
t"r-"
FNo.
~:
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.
,-l
<""II. 14__
--
17-&1-1'd
IR~
PREFIXJDOCUMEN" NO.
ii," I;;':,;~
SPARE PARTS LIST .
ASCII 1ST -II 8ASIC TERMINAL
~SHEET
((629.1/8
CODE IDENT
15920
6~~
SPL
FIRST USED ON
1 Of 4
REVISION RECORD
SHEET REVISION STATUS
3
4
2
1
\"0 00 100 lco
1
100 10/ 00 \01
A
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TOP LEVEL ASSY
EQUIPMENT CONfIGURATOR
~QU1EM~~T
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15632331
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Individual keycaps are documented in drawing "6312517.
3.
Indicated parts are inclucled as part of Keyboard
4.
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5.
Indicated parts are inclUded as part of OA8» PC Assy 90446266.
Assy
51'140851.
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Indicated pa",ts are included as part of OA(D PC Assy 90460881·
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Xformer re quired for (Cb298 only.
8.
Other Applicable I Reference »ocuments,
~:!o9],9707
Not used on ((629A.
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9.
10.
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PRINTED IN U.S.A •
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2.
EQUIPMENT CONFIGURATOR---------15632062
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is that used per
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COMMENT SHEET
MANUAL TITLE:
40003-22/23 Information Systems Terminal III
Hardware Maintenance Manual (Site and Support Information
PUBLICATION NO.:
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