999853 9701 820 KSR Terminal Maintenance Manual Dec78
999853-9701__820_KSR_Terminal_Maintenance_Manual_Dec78 999853-9701__820_KSR_Terminal_Maintenance_Manual_Dec78
999853-9701__820_KSR_Terminal_Maintenance_Manual_Dec78 999853-9701__820_KSR_Terminal_Maintenance_Manual_Dec78
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.Maintenance
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Model,820,.KSR
:, '. Jerrhi"raal'
'. Mamiel No.999853-9701 .
. , ~C£_R 1978"
T£XASINSTRUM
EN Tiitp;
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INCORPORATED
Copyright 1978 by Texas Instruments Incorporated
A" Rights Reserved - Pr~nted In USA
The information and/or drawings set forth in this document and all rights in and to
inventions disclosed herein and patents which might be granted thereon disclosing or
employing the materials, methods, techniques or apparatus descrtbed herein are the
exclusive property of Texas Instruments Incorpor~ted.
or
No copies of the information
drawings snarf be made without the prior consent of
Texas Instruments Incorporated.
.
CHANGE NOTICES
R..ilion
Letter
Date
ECN
Number
Level
Description
.
;
,,:
~,
'
.
...•
,
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,
'
ii
PREFACE
This manual provides detailed information for installing, operating, maintaining and replacing assemblies
and subassemblies of the Texas Instruments Omni 800* Model 820 keyboard send receive (KSR) data
terminal. The information is divided into the following sections:
General Description: This section contains a list of terminal specifications and
SECfIONI
features, locates the major terminal components, and identifies the various terminal
versions and options.
SECTION II
::
InstaUation: This section provides instructions for selecting a suitable site for the
terminal, installing the supplies, making cable connections, applying power, performing terminal checkout, and configuring the terminal.
SECTION III
Operation: This section provides a complete functional description of the terminal
including the use of controls and indicators.
SECTION IV
Theory of Operation: This section identifies the functional components of the
terminal and provides detailed discussions of the operation of each functional
. component .
SECTION V
. Maintenance: This section contains preventative and corrective maintenance procedures, adjustment procedures, and removal and replacement procedures for all
replaceable assemblies.
SECTION VI
Assembly Drawings and Parts Lists: This section contains assembly drawings and
parts lists for all replaceable assemblies.
SECTION VII
Diagrams: This section contirins logic diagrams.
APPENDIX A
Character Set Dot Matrix
. APPENDIXB
Character and Control Codes
APPENDIXC
Terminal Options and Accessories
APPENDIXD
Ribbon and Paper Recommendations
APPENDIXE
InstaUation Instructions For Option Kits
APPENDIXF
Glossary of Logic Signals
iii/iv
TABLE OF CONTENTS
Paragraph
Title
Page
SECTION I. GENERAL DESCRIPTION
1.1
1.2
1.3
1.4
1.5
Introduction ............................................................
Features and Specifications ................................................
Options ...... : .........................................................
Accessories ......................................... . . . . . . . . . . . . . . . . . . ..
Identification ...........................................................
1-1
1-1
1-1
1-3
1-3
SECTION II. INSTALLATION
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
2.9.1
2.9.2
2.9.3
2.9.4
2.9.5
2.9.6
2.9.7
2.9.8
2.9.9
2.10
2.10.1
2.10.2
2.10.3
2.10.4
2.10.5
2.10.6
2.10.7
2.10.8
2.11
Introduction ............................................................ 2-1
Space Requirements ..................................................... 2-1
Power Cord Connection ................................................... 2-2
Paper Loading .......................................................... 2-3
Ribbon Installation ........................................................ 2-4
Power-On Procedure ..................................................... 2-5
Power-Off Procedure ..................................................... 2-6
Operational Checkout and Printhead Adjustment ............................... 2-6
Configuration Parameter Selection .......................................... 2-8
Configuration Set Selection (01-09) ..................................... 2-8
Communications Mode (11-15) ........................................ 2-8
Communications Rate ............................................... 2-10
Parity (31-38) .... , ................................................ 2-10
Line Control (61-64) ................................................. 2-11
Transmission Control (71-72) .......................... : .............. 2-12
Terminal Control (81-89) ............................................ 2-13
Programmable Parameters (ABM, LTA, ENTER) ........................ 2-14
Configm:ation Report ............................................... 2-15
Configuration Parameter Entry ............................................ 2-15
Initiate Configuration ............................................... 2-15
Review Current Configuration ........................................ 2-15
Enable Mutually Exclusive Parameters ................................. 2-16
EnableON/OFFParameters .......................................... 2-16
Disable ON/OFF Parameters ......................................... 2-16
Program the ABM, LTA, and ENTER Key .............................. 2-17
Configuration Errors ................................................ 2-17
Terminate Configuration ............................................. 2-17
Communications Interface Cable Connection ................................. 2-18
SECTION III. OPERATION
3.1
Introduction ............................................................ 3-1
v
TABLE OF CONTENTS (Continued)
Paragraph
3.2
3.2.1
3.2.1.1
3.2.1.2
3.2.1.3
3.2.1.4
3.2.1.5
3.2.2
3.2.2.1
3.2.2.2
3.2.3
3.2.4
3.2.5
3.3
3.3.1
3.3.2
3.3.3
3.3.4
3.3.4.1
3.3.4.2
3.3.4.3
3.3.5
3.3.6
3.3.7
3.3.8
3.4
3.4.1
3.4.2
3.4.3
3.4.4
3.4;5
3.4.5.1
3.4.5.2
3.4.5.3
3.4.5.4
3.5
3.5.1
3.5.2
3.5.3
3.5.4
3.5.5
3.6
TItle
~
Operator's Panel .............. '.' '.' . ',' ........... , ........................ 3-1
Control Panel ....... '.. . . . . . . . . •. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-1
LINE/-/LCL Switch ............................................ 3-1
VIEW/OFF Switch (Last Character Visibility .......................... 3-1
LINE ROY and CARR RCV Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-3
Tenninal Status Display (TSD) .................................... 3-3
Special Function Keys ........................................... 3-6
Typewriter Keyboard ................................................ 3-6
Code Generating Keys ........................................... 3-6
lIERE IS Key .................................................. 3-7
Numeric Keypad Option .............................................. 3-7
CONFIGURE/OPERATE Switch ...................................... 3-7
Audible Tone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-8
Printer ..... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...... '. . . . . . . . . .. 3-8
Character Set and Font ....................................... :........ 3-8
. Fonnat Parameters .................................................. 3~8
End-of-Line Alann ................................................. 3-10
Printer Operation ................................................... 3-10
Printable Characters ....•....................................... 3-10
Automatic New Line ........................................... 3-10
Control Characters ............................................. 3-10
Setting the Top-of-Fonn ............................................. 3-11
Paper-Out Condition ................................................ 3-11
Mechanism Failure Detection ......................................... 3-11
Data Buffering and Printer Throughput ................................. 3-11
Communications Interface ................................................ 3-12
Interface Signals ................................................... 3-12
Interface Signal Levels .............................................. 3-14
Local Mode ....................................................... 3-14
Standby Mode ..................................................... 3-14
LINE Mode ....................................................... 3-15
Full-Duplex Operation .......................................... 3-15
Half-Duplex (Without Reverse Channel) Operation ................... 3-16
Half-Duplex with Reverse Channel Operation ..................... :. 3-17
Console Operation .................... :........................ 3-18
Options ............................................................... 3-18
Device/Fonns Control (DFC) ........................ ~ . . . . . . . . . . . . . . .. 3-18
Compressed Print .................................................. 3-19
User-Defmed Configuration Sets ...................................... 3-20
Alternate Character Set - ASCII/APL .................................. 3-21
Numeric Keypad .................................................... 3-22
Operator's Reference Cards ............................................... 3-23
vi
TABLE OF CONTENTS (Continued)
Paragraph
Title
Page
SECTION IV. THEORY OF OPERAnON
4.1
4-2
4.2.1
4.2.2
4.2.3
4.2.4
4.2.5
4.2.6
4.3
4.3.1
4.3.2
4.3.2.1
4.3.2.2
4.3.2.3
4.3.2.4
4.3.3
4.3.4
4.4
4.4.1
4.4.2
4.4.3
4.4.4
4.5
4.5.1
4.5.2
4.5.3
4.6
4.6.1
4.6.2
4.7
4.8
4.9
4.9.1
4.9.2
4.10
4.10.1
4.10.2
4.11
General .......................... ..................................... 4-1
Power Supply ........................................................... 4-2
Input Voltage Selection and Rectification ......... : ...................... 4-3
Soft-Start Circuit .................................... , ............... 4-4
Blocking Oscillator Circuit ............................................ 4-5
Reference Sensing Circuit ............................................ 4-5
Secondary Filtering and Regulation Circuits .............................. 4-5
Power-Good Circuit ................................................. 4-6
Terminal Controller Subsystem ............................................. 4-6
TMS 9980 Microprocessor ............................................ 4-7
Terminal Controller Memory .......................................... 4-7
Read Only Memory ............................................. 4-7
Nonvolatile Memory ............................................ 4-7
Random Access Memory ......................................... 4-8
Programmable Read Only Memory (Optional) ........................ 4-8
Memory Control Logic .......................................... 4-8
System Clock and Interrupt Logic .................. . . . . . . . . . . . . . . . . . . .. 4-8
Operator Interlace ....................................................... 4-8
Keyboard/Switch Scan ............................................... 4-9
Keyboard Matrix .................................................... 4-9
Terminal Status Display and Indicators ................................. 4-10
Keyboard Interface ................................................. 4-10
Communications Interface ................................................ 4-12
Interface Signals ................................................... 4-12
Signal-Level Conversion ............................................ 4-12
Asynchronous Communication Controller ............................... 4-12
Ribbon Drive Subsystem ................................................. 4-12
Ribbon Motor Drive ................................................ 4-12
Ribbon Motor Direction ............................................. 4-13
Terminal Controller/Printer Controller Interface ............... . . . . . . . . . . . . . .. 4-13
Printer Controller Subsystem .............................................. 4-15
Paper Drive Subsystem .................................................. 4-16
Paper Motor Driver Circuit ........................................... 4-16
Paper-Out Detection ................................................ 4-17
Printhead Carriage Drive Subsystem ........................................ 4-17
Printhead Positioning ............................................... 4-17
Carriage Jam Detection .............................................. 4-19
Character Printing ...................................................... 4-19
vii
TABLE OF CONTENTS (Continued)
Par8llJ'llPh
Title
Page
SECI10N V. MAINTENANCE
5.1
5.2
5.2.1
5.2.2
5.2.3
5.3
5.3.1
5.3.1.1
5.3.1.2
5.3.1.3
5.3.1.4
5.3.1.5
5.4
5.4.1
5.4.2
5.4.2.1
5.4.2.2
5.4.3
5.4.4
5.5
5.6
5.6.1
5.6.2
5.6.3
5.6.4
5.6.5
5.6.6
5.6.7
5.6.8
5.6.9
5.6.10
5.6.11
5.6.12
5.6.13
IQtroduction ............................................................ 5-1
Preventive Maintenance ........................... . . . . . . . . . . . . . . . . . . . . . .. 5-1
Preventive Maintenance Schedule ...................................... 5-1
Vacuum the Printhead Area .. ;........................................ 5-1
Oil Top Guide Rod and Clean Ribbon Guides and Lower Guide Rod ........... 5-2
Self-Tests ................................................................ 5-3
Power-Up Diagnostic Tests .............. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-3
Indicator Test .................................................. 5-3
RAM Test ..................................................... 5-3
ROM Test ..................................................... 5-3
Nonvolatile Memory Test ........................................ 5-3
Audible Tone Test .............................................. 5-3
Maintenance Tests ....................................................... 5-3
Barberpole Test ...................................................... 5-4
Communications Test ................................................ 5-4
Using EIA Plug ... . . . . . . . . . . . . . . . . . ... . . . . . . . . . . . . . . . . . . . . . . . . .. 5-4
Acoustic Coupler Transmit Level Adjustments ........................ 5-5
Configuration Report ................................................ 5-6
ROM Identification Report ............................................ 5-6
Troubleshooting ......................................................... 5-7
Assemblies Removal and Replacement ....................................... 5-7
Removal and Replacement of Terminal Cover ............................. 5-7
Removal and Replacement of the Keyboard Plenum ....................... 5-12
Removal and Replacement of the Fan Assembly .......... :............... 5-13
Removal and Replacement of the Keyboard Assembly
(Keyboard PWB or Emulator Decrementor PWB' s) ....................... 5-14
Removal and Replacement of the Logic PWB
(Main Electronic PWB) ............................................. 5-15
Removal and Replacement of Logic PWB Battery . . . . . . . . . . . . . . . . . . . . . . .. 5-16
Removal and Replacement of PWB Fuse (250V, 3A) ...................... 5-16
Removal and Replacement of Paper Drive Motor ......................... 5-17
Removal and Replacement of the Tractor Assembly ....................... 5-18
Removal and Replacement of the Printhead .............................. 5-19
Printhead Ribbon Guide Adjustment ................................... 5-20
Removal and Replacement of the Ribbon Drive Subassembly ............... 5-21
Removal of the Carriage Motor and Mechanism
(Or Wire Rope Or Mechanism) ....................................... 5-22
viii
TABLE OF CONTENTS (Concluded)
SECTION VI. ASSEMBLY DRAWINGS AND LISTS OF MATERIALS
SECTION VII. DIAGRAMS
APPENDICES
APPENDIX A
APPENDIXB
APPENDIXC
APPENDIXD
APPENDIXE
APPENDIXF
Character Set Dot Matrix
USASCII/ APL Codes
Model 820 KSR Tenninal Options and Accessories
Omni 800 Model 820 Printer Ribbon and Paper Recommendations
Installation of Optional Kits
Glossary of Model 820 KSR Logic Signals
INDEX
LIST OF TABLES
Title
Table No.
1-1
Model 820 KSR Specifications
............................................. 1-2
2-1
2-2
Configuration Codes ..................................................... 2-9
113A/103, 202/212 Data Set Cable (TI Part No. 993205-(01) ................... 2-19
3-1
3-2
3-3
3-4
3-5 .
3-6
3-7
LINE ROY and CARR RCV Indicators ...................................... 3-4
Status Codes ............................................................ 3-4
Interpreting Tenninal Status Display (TSD) Functions ........................... 3-5
Audible Tone Operation ..................... . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-8
Interface Signals ......................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-13
Device Control Commands ............................................... 3-19
Forms Control Commands ................................................ 3-20
4-1
Motor Driver Acceleration Control Output ................................... 4-18
5-1
5-2
5-3
820 KSR Failure Analysis Chart ............................................ 5-8
Option PROM/ROM Part Numbers and Locations ............................. 5-11
Strappable Option on Logic PWB (999694-000 1) ............................. 5-11
ix
LIST OF ILLUSTRATIONS
Figure No.
Title
Page
1-1
Omni 800 Model 820 KSR Terminal ......................................... 1-3
2-1
2-2
2-3
2-4
2-5
2-6
2-7
2-8
2-9
Physical Dimensions ................. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-1
Model 820 KSR Rear Panel ................................................ 2-2
Paper Loading .......................................................... 2-3
Ribbon Installation ....................................................... 2-4
Power-on Procedure Switches .............................................. 2-5
Controls for Model 820 KSR Self-Test ....................................... 2-6
Self-Test Results ........................................................ 2-7
Communications Interface Cable Connections ................................ 2-18
Data Terminal Cable (TI Part No. 0993210-000 1) ............................. 2-19
3-1
3-2
3-3
3-4
3-5
3-6
3-7
OMNI 800 Model 820 KSR Data Terminal
3-2
The Operator's Panel ..................................................... 3-3
CONFIGURE/OPERATE Switch ........................................... 3-7
Format Parameters ....................................................... 3-9
APL Keyboard ......................................................... 3-22
Control Panel, USASCII/ APL Option ...................................... 3-22
Numeric Keypad ....................................................... 3-23
4-1
4-2
4-3
4-4
4-5
4-6
4-7
4-8
4-9
4-10
4-11
Model 820 KSR, Simplified Functional Block Diagram .. . . . . . . . . . . . . . . . . . . . . . .. 4-1
Power Supply Block Diagram .............................................. 4-2
Input Voltage Selection and Rectification ..................................... 4-3
Soft-Start Circuit ........................................................ 4-4
Terminal Controller Simplified Block Diagram .............•...-............... 4-6
Keyboard Matrix Simplified Diagram .................... :................... 4-9
Terminal Displays, Simplified Diagram .................................. :.. 4-10
Keyboard PWB Simplified Diagram ........................................ 4-11
.Asynchronous Data Format ............................................... 4-12
Terminal Controller/Printer Contr<;>ller Interface Simplified Block Diagram ......... 4-14
Printing the Letter "E" ......•........................................... 4-20
5-1
5-2
5-3
Printhead Area, Guide Rods, and Ribbon Guide ................................ 5-2
Normal Results of Barberpole Test .......................................... 5-5
Logic PWB Battery Details ............................................... 5-16
6-1
Model 820 KSR Illustrated Major Assemblies
x
................................. 6-2
SECTION I
GENERAL DESCRIPTION
1.1 INTRODUCTION
The Texas Instruments Omni 8()()* Model 820 Keyboard-Send Receive (KSR) Tenninal shown in Figure 1-1
consists basically of
•
A printer which provides one original and up to five copies of data received via a communications
interface.
•
An operator's panel which pennits entry of data on the keyboard for transmission to a host system
or other terminals via a communications interface.
1.2 FEATURES AND SPECIFICATIONS
The Model 820 KSR is a compact self-contained data tenninal, similar in appearance to an office typewriter,
which communicates in an attended or unattended mode via appropriate transmission media. The Model 820
KSR is highly suitable ·for conversational, data/text entry, inquiry-response, and computer console
applications.
The Model 820 KSR communicates serial, asynchronous data at rates from 110 to 9600 baud and is capable
of printing at speeds up to 150 characters per second (CPS). Printing is done by means of a serial, wire-matrix
impact mechanism which prints on conventional paper and features multiple copy, wide carriage, and
optional fonns handling capabilities. An internal buffer memory enables the Model 820 KSR to receive burst
data at transmission rates which exceed its maximum printing speed.
The control electronics consists primarily of a stored-program microprocessor system which provides a high
degree of flexibility with the fewest possible components. All operating parameters (e.g., communications
rate, parity, etc.) can be altered from the keyboard, thereby eliminating the need for hardware strappable
options and minimizing special operator controls. The modular construction of the electrical and mechanical
assemblies greatly facilitates maintenance and repair.
Table 1-1 lists the specifications for the Model 820 KSR data terminal.
1.3 OPTIONS
The following features are available as options for the Model 820 KSR:
CQmpressec:i print-
provides 16.5 and 10.0 characters per 25.4 mm (l inch) horizontal pitch
Device/forms control-
provides extensive tenninal and fonnat capabilities, including horizontal
and vertical tabs, margin and fonn length control, printer ON/OFF, etc.
Numeric Keypad -
an I8-key cluster, including a user-programmable ENTER key, similar
to a calculator keyboard for fast number entry .
*Trademark of Texas Instruments Incorporated
1-1
Table 1-1. Model 820 KSR Specifications
Continuous feed, fanfold, or multipart
(original + 5 copies)
54.8 m (60 yards) or 36.58 m(40 yards),
auto reversing
LINE FEED 30 milliseconds
TIME:
PAPER SLEW RATE: 190.5 mm (7.5 in.) per second
ADJUSTMENTS: Forms width, thickness, and alignment
FORM LENGTH: 279.4 mm (11 in.)
DETECTION: Paper-out. carriage jam
POWER REQUIREMENTS
VOLTAGE: 90-130 Vac, 47-63 Hz, single phase
180-260 Vac, 47-63 Hz, single phase
POWER:
PAPER
TYPE:
RIBBON:
50 VA max, idle
75 VA average printing
150 VA max. executing form feed
PHYSICAL DiMeNSIONS
SIZE:
660.4 mm (26.0 in.) W x 533.4 mm (21.0
in.) D x 209.5 mm (8.25 in.) H
WEIGHT:
18.6 kg (41 pounds) excluding options
KEYBOARD
TYPE: Full ASCII
LAYOUT: Typewriter
ROLLOVER: N-Key
INDICATORS: Terminal and Communications status
ACOUSTIC NOISE
LEVEL:
Less than 60 dB (A-weighted), measured
0.9 meter (3.0 feet) directly in front under
free field conditions while printing at 150
characters per second
COMMUNICATIONS
INTERFACE: EIA RS-232-C
TYPE TRANSMISSION: Asynchronous
CODE: ASCII
SPEEDS: 110,200,300,600, 1200,2400,4800,9600
Baud
MODES: Full duplex, half duplex, half duplex with reverse channel
PARITY: Transmit odd, even, mark, space
Check-odd, even, none
RECEIVE BUFFER: 640-characters
LINE CONTROL: Autoanswer, autodisconnect, printer
ready/busy
IDENTIFICATION: 21-character answerback memory
ENVIRONMENTAL (OPERATING) .
TEMPERA- 5° C to 40° C
TURE:
RELATIVE 5 % to 90 % (no condensation)
HUMIDITY:
ALTITUDE: To 3046 m (10,000 feet)
PRINTER
METHOD:
SPEED:
PATTERN:
CHARACTERSET:
CHARACTERSPER
LINE:
CHARACTERSPACING:
LINE
SPACING:
PAPER
DRIVE:
PAPER
FEED:
PAPER
WIDTH:
Wire matrix impact
150 characters per second
9 x 7 dot matrix
95 ASCII plus 33 control character graphics plus parity error symbol
132 max.
OPTIONS
PRINTER: Compressed print (16.5 characters-perinch)
CONTROL: Device/Forms Control
KEYBOARD: 18 key nl,Jmeric keypad
APLIASCIl
International keyboards
INTERFACE: dc current loop
.
300-baud acoustic coupler
CONFIGURATION: User-specifiable default parameter sets (up to eight) Userspecifiable protected parameter
sets (up to eight)
10 per 25.4 mm (1 in.)
6 per 25.4 mm (1 in.)
2 pinfeed tractors (4 pin)
Rear or bottom
76.2 mm (3.0 in.) to 377.8 mm (14.875 in.)
1-2
Figure 1-1. Omni 800 Model 820 KSR Terminal
Alternate character sets -
APL and Katakana
International keyboards-
England, France, Germany, Denmark/Norway, and Sweden/Finland
keyboards and character sets.
Communications Interface -
dc current loop and acoustic coupler
Configuration sets -
provides up to eight user-defined configuration-parameter sets to
facilitate the use of the terminal with a variety of host systems.
1.4 ACCESSORIES
The following useful accessories are available for the Model 820 KSR:
•
Paper basket -
holds the printed output
•
Terminal stand -
•
Noise enhancement kit -
•
Interface cables -
for user convenience
significantly reduces noise
for console and special connections.
1.S IDENTIFICATION
The particular configuration of the Model 820 KSR may be identified by the printer configuration label
affixed inside the terminal cover. Table 1-2 defines the abbreviations used to identify the Model 820 KSR.
1-3
Table 1-2. MCMlel820 KSR Hardware Configuration Abbreviations
PRINTER CONFIGURATtONS
BSC
115V
220V
CSA
PSF
PCF
MFG
COMMUNICATION OPTIONS
Basic Model 820 KSR
115 volt operation
220 volt operation
Standard EIA RS-232.-C interface
Standard printer (10 characters per inch)
Compressed print option (10 and 16.5
characters per inch)
Device/Forms Control (DFC) option
CAC
CTY
3OO-baud acoustic coupler
20-mA dc current loop
CONFIGURATION OPTIONS
MOP
MPP
KEYBOARD OPTIONS
KFS
Standard full ASCII
KFN
Standard full ASCII with numeric pad
KAS
APL/ ASCII
KAN
APL/ASCII with numeric pad
KKS
Katakana/ ASCII
KKN
Katakana/ASCII with numeric pad
Default configuration option
Protected configuration
option
CHARACTER SET SUBOPTIONS
UKF
United Kingdom ASCII
DNF
Danish/Norwegian ASCII
SFF
Swedish/Finnish ASCII
FRF
French ASCII
GRF
German ASCII
1-4
SECTION II
INSTALLATION
2.1
INTRODUCTION
This section provides suggestions for selecting a suitable location for the terminal, installing the supplies,
making power and interface connections, applying power, performing checkout procedures, and selecting
the appropriate operating parameters. This discussion assumes that the Model 820 KSR has been removed
from the shipping container and that all shipping fixtures are removed from the terminal.
2.2 SPACE REQUIREMENTS
The Model 820 KSR data terminal occupies a flat surface area 660 mm (26 inches) wide by 609 mm (24
inches) deep, including cable clearance of 76 mm (3 inches). Figure 2-1 lists the outline dimensions of the
Model 820 KSR, including space for adequate ventilation. Take particular care not to block the cooling fan
intake and exhaust louvers located on all four sides of the terminal.
An unobstructed paper feed path must be provided behind or below the terminal for the paper supply. A
method of holding the printer outut paper must also be provided if the optional paper basket accessory is not
used. The terminal should not be operated in an environment where humidity, temperature, or other
specifications listed in Table 1-1 may be exceeded. A sturdy table capable of adequately supporting 18.6
kilograms (41 pounds) is suitable if the optional floor mounting stand is not used. Regardless of the mounting
selected, take care to ensure that the paper chute underneath the terminal does not bear any weight of the
terminal and is not subjected to any pressure which could deform it.
1 4 - - - - - - - 5 3 3 M M - - - - - - -....!,
(21 IN}
14-----------660MM---------~
(26IN)
Figure 2-1. Physical Dimensions ,
2-1
2.3
POWER CORD CONNECTION
Note the printer configuration label affixed to the inside of the cover to detennine the input voltage
requirements and then position the tenninal close to an appropriately grounded electrical outlet so that the
supplied power cord can be connected. Referring to Figure 2-2, locate the power ON/OFF switch and the
power cord receptacle at the rear of the Model 820 KSR and proceed as follows:
a.
Ensure that the power ON/OFF switch is in the OFF (down) position.
b.
Attach the female connector of the power cord to the tenninal power cord receptacle (next to the
ON/OFF switch).
c.
Attach the male connector of the power cord to the electrical outlet.
WARNING
To ensure safe operation of the Model 820 KSR tenninal, always use a
properly grounded power source with the correct voltage, frequency, and
current capacity.
IIIII1111111
POWER CORD RECEPTACLE
COMMUNICATIONS
INTERFACE CONNECTOR
ON/OFF POWER SWITCH
Figure 2-2. Model 820 KSR Rear Panel
2-2
2.4 PAPER LOADING
The Model 820 KSR will accommodate continuous form paper with standard sprocket holes on each side in
widths from 76.2 to 377.8 mm (3.0 to 14.875 inches). Single or multipart forms meeting the specifications of
TI Publication 0999860-9701, Omni BOO ModelB20 Printer Ribbon and Paper Recommendations (Appendix
D) may be used. Referring to Figure 2-3, locate the controls for forms thickness adjustment (adjust lever) and
forms width adjustment (flaps) and proceed as follows:
PA 1 H 8
Figure 2-3. Paper Loading
a.
Lift the terminal cover and open the flaps on both paper tractors.
b.
Using the printhead adjust lever, move the printhead away from the platen.
c.
Feed the paper into either the rear paper chute (path A) with the printing side of the paper down or
the bottom paper chute (path B) with the printing side of the paper facing you until the paper
appears at the platen.
d.
Loosen the locking knob on the nght tractor and move the tractor left or right as necessary to
accommodate the paper width.
e.
Place the paper in both tractors so that corresponding holes and pins engage the paper on both
sides.
f.
Close both tractor flaps.
g.
Adjust the right tractor as necessary to remove slack in the paper and then tighten the locking
knob.
h.
Check that the paper supply is aligned in the paper chute and that the paper does not rub the side of
the paper chute.
i.
Reposition the printhead using the adjust level.
J.
Close the terminal cover.
2-3
2.S RIBBON INSTALLATION
The Model 820 KSR uses a nylon ribbon mounted on two spools as described in TI Publication 09998609701, Omni 800 Model 820 Printer Ribbon and Paper Recommendations (included in Appendix D).
CAUTION
Use of ribbons which do not meet TI specifications may seriously shorten
printhead life and void the warranty.
Referring to Figure 2-4, proceed as follows:
•
/
ADJUST LEVER
SHIFT ARM
Figure 2-4. Ribbon Installation
a.
Lift the terminal cover.
b.
Using the printhead adjust lever, move the printhead away from the platen.
c.
Place the full ribbon spool on either hub so that the ribbon exits from the far side.
d.
Feed the ribbon along the path as shown in Figure 2-4.
e.
Place the empty ribbon spool on the other hub and remove slack from the ribbon my manually
rotating one of the spools in the appropriate direction.
f.
Check that the empty spool ribbon eyelet is between the spool and the shift arm and that the ribbon
is properly positioned between the vertical ribbon guides on each side of the printer.
g.
Reposition the printhead using the adjust lever.
k.
Close the terminal cover.
2-4
2.6 POWER-ON PROCEDURE
Referring to Figure 2-5, locate the CONFIGURE/OPERATE switch, the IJNE/-/LCL switch, and the
terminal status display and proceed as follows:
a.
Set the LINE/-/LCL switch to the LCL position (lower edge depressed).
b.
Lift the terminal cover and set the CONFIGURE/OPERATE switch to the OPERATE position
(toward the upper edge of the keyboard). Close the terminal cover.
TERMINAL
STATUS
DISPLAY (TSD)
LlNE/. /LCL SWITCH
CONFIGURE/OPERATE SWITCH
Figure 2-5. Power-on Procedure Switches
c.
Set the power ON/OFF switch to the ON position (up).
d.
Ascertain that the following events occur:
•
The terminal status display (TSD) shows8BB and the LED indicators are illuminated
-
The printhead aligns to the left margin
-
The audible tone sounds
•
The TSD shows D[J : (or the left margin setting if the left margin is not set to column 1)
and the LED indicators go off.
2-5
2.7 POWER-OFF PROCEDURE
To remove power from the terminal, simply set the power ON/OFF switch to the OFF position (down). The
Model 820 KSR retains operating and format parameters in a nonvolatile memory so that the terminal is ready
to operate when power is again applied.
2.8 OPERATIONAL CHECKOUT AND PRINTHEAD ADJUSTMENT
Referring to Figure 2-6, locate the CTRL, SHIFT, !/1, and RESET keys on the operators panel and proceed as
follows:
CAUTION
Do not operate the printer without ribbon and paper installed. Printhead
damage will occur and the warranty may be voided.
Texas Instruments
OMNi 800
820 KSR TERMINAL
r----HT--t--VT--+FORI
SET
CLEAR
SET
LINE
ROY
0
LINE
ALTN
CHAR
-
CARR
RCV
0
0
SO-Sl
VIEW
§ § E]
LCL
LOCK
OFF
SIZI
BOJ(I]GJITJG
GGJGJGJGJI
0 8§GJGJGJGJ
GJ
BQGJGJC
[BREAK}
u u u
~~~
CLEAR
[RESEi
[FORM}
AOV
Figure 2-6. Controls for Model 820 KSR Self-Test
2-6
a.
Switch the LINE/-/LCL switch to LCL.
b.
Initiate the self-test by pressing and holding the CTRL and SHIFf keys and then momentarily
pressing the !/ I key; then release all keys.
c.
Observe that a repetitive, ripple pattern (called a barberpole) is printed and that the TSD displays
:::d':';.
d.
If the printed characters are partially formed or have missing dots as shown in Figure 2-7a, the
printhead is set too far from the platen: Correct this malfunction by rotating the adjust lever toward
the rear of the terminal.
e.
If the printed characters are smeared as shown in Figure 2-7b, the printhead is set too close to the
platen: Correct by rotating the adjust lever toward the front of the terminal.
f.
If the characters are clearly formed and not smeared as shown in Figure 2-7c, the printhead is
satisfactorily adjusted.
g.
Terminate the self-test by momentarily pressing the RESET switch.
,
",,*¢.,,-,:.~,.,
I "#~ ~.~~",
1\
(
l ii
1 '-':':!4
*+" -"
2 :! 4 ""i I... 7!~q ~
?·:':4-C:';.,7!:p:-, ~ ~
1(11
,I rq
a.
, '!'"1f$'l.-&'-TT*+; -.
" ! '1'#$1.81."" (
<":::::":,'::ori>ARI''l''iFFI':;H f ,11<'\ !"H·\"'F'f'lr.;o·:: F I~!I.I¥ Y 7.
<'-:;:"':·"){i>A'R1TIFs=nH J ' W'II'1NnpoR'::"P .I\}I,I 'Iv' 7 I
: ,,"="':,':,·/CIA'Rr-r'FFf"H T ' WU1Hf'lPoP·:;'lI. l \J\.ri' Y 7. r \
':~=":'~:'{"AY;H"'f"FF("'iT ,11-:-:1 MNnpr.tp·:n'II\)\.I'iY 7 [ .... 1
"';!~. 7!::{O:) ~ ~
,1>--1-" - , / (i 1 ':::··':!4C:;l,.7!~·:-J ~ !
',*+ .. -
#<;"<;:,-' I
#$~(.;v' { i
I ) ..,:,+, 'i
Printhead too far from platen
!012345678'~/:
; <:=:>?@ABCDEFGHIJKLMNOP(;,~RSTUVWXYZ'
HH;'-~ 10123456789-: '; (=>?@ABCDEFGHl'JI?@ABCDEFGHI.JI?@ABC[lEFGHIJKLMNOPQRSTUVWXYZt'\J'
•
b.
~
Printhead too close to platen
H#$%k' ()*+, -./012::::456789:; (=>?@ABCDEFGHI ...IKLMNOPG~RSTUVWXYZ
~"#$'I.&'()*+,-./0123456789:;(=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[
"#$%~I.' ( ) *+, -./012345678'3": ; <':=>?@ABCDEFGHI.JKLMNOPG!RSTUVWXYZ[\
#$%&'- ( ) *+, -. /0123451.':.7:39: ; (=>?@ABC[lEFGHIJKLMNOPQRSTUVWXYZ[\]
c.
Printhead adjusted correctly
Figure 2-7. Self-Test Results
2-7
This self-test performs an operational checkout of 95 percent of the terminal electronics. If the correct test
results are not observed, refer to Section 5, Maintenance.
Note that it may be necessary to readjust the printhead occasionally to compensate for ribbon wear.
2.9 CONFIGURATION PARAMETER SELECTION
All host system-dependent operating parameters such as communications mode, baud rate, and parity are
entered from the keyboard. These operating parameters are designated by two-digit codes called
configuration codes. The configuration codes are summarized in Table 2-1. A description of the Model 820
KSR configuration codes follows.
2.9.1 CONFIGURATION SET SELECTION (01-09). A configuration set defines all operating
parameters for a particular terminal application. The definition of the configuration set parameters is
01-OS
-
User-defined configuration sets are optional features of the terminal. The user may specify
up to eight complete sets of configuration parameters which are identified by the codes
01-08.
09
The default configuration set has the following parameters enabled:
13 - Full-duplex
29 - Auto-select
32 - Even parity, no parity check
2.9.2 COMMUNICATIONS MODE (11-15). The communications (or duplex) mode determines the
protocol used in exchanging data with the host system. Note that one (and only one) of parameters 11-15 must
be enabled at all times.
11
Half-duplex refers to the use of a communications channel such as that provided by a Bell
System 202 data set (or equivalent) which permits exchange of data in only one direction at
a time. A line-turnaround character (LTA) must be used in this mode. When the Model 820
KSR receives an LTA, it switches to transmit mode; when the Model 820 KSR transmits an
LTA, it switches to receive mode.
12
Half-duplex with reverse channel is a similar to half-duplex, except a low-frequency
secondary channel is used to provide circuit assurance from the receiving to the
transmitting station.
13
Full-duplex refers to the use of a communications channel such as that provided by a Bell
System 212 data set (or equivalent) which permits simultaneous, bidirectional data
exchange.
14
Full-duplex with reverse channel ON for ready is used for console operation; i.e., for
applications without a modem. The Model 820 KSR switches reverse channel ON when
ready and OFF when busy.
15
Full-duplex with reverse channel OFF for ready is identical to parameter 14, except that
operation of the reverse channel is inverted.
2-8
Table 2-1. Configuration Codes
MEANING
CODE
01 to 08
09
11
12
13+
14
15
21
22
23
24
25
26
27
28
29+
Predefined Configuration Selection (one only)
Select corresponding predefined configuration set
Select standard default configuration set
Transmission Rate Selection (one only)
110 baud
200 baud
300 baud
600 baud
1200 baud
2400 baud
4800 baud
9600 baud
300/1200 baud (for use with type 212 data set with speed-select option)
38
60
61
62
63
64
Line Control Parameters (no limit)
Program line turnaround characters for half duplex (202)
Enable failsafe disconnect
Disconnect on receipt of EaT
Disconnect on receipt of OLE EaT
Disconnect on paper-out or carriage jam
37
70
71
72
80
81
82
83
84
85
86
87
88
89
II
YES
Communications Mode Selection (one only)
Half duplex (for use with type 202 data set)
Half duplex & reverse channel (for use with type 202 data set)
Full duplex (for type 103, 113, 212 data sets)
Full duplex & reverse channel ON f:.Jr ready (for use as a console)
Full duplex & reverse channel OFF for ready (for use as a console)
Parity Selection (one only)
Odd parity, no parity check
Even parity, no parity check
Odd parity, indication on error
Even parity, indication on error
Odd parity, indication plus printed symbol on error
Even parity, indication plus printed symbol on error
Parity bit mark, no parity check
Parity bit space, no parity check
31
32+
33
34
35
36
OPTION
REQUIRED
Transmission Control Parameters (no limit)
Program answer-back memory (ABM)
Auto-trigger ABM on connection
Enable print of ABM contents (local HERE IS or code 82 set)
Terminal Control Parameters (no limit)
Program ENTER key on numeric keypad
Enable device & format control from the communication line
Enable local copy of transmitted data
Transmit DC3 or BREAK on printer-busy DC1 or LTA on ready
Do "new line" on receipt of LF
Do "new line" on receipt of CR
Transmit CR LF when RETURN key is pressed
Print all control characters
Set compressed print (16.5 CPI) only
Set absolute right margin at column 80
Invalid configuration code has been entered
• Standard default parameter configuration set
2-9
YES
YES
YES
2.9.3 COMMUNICATIONS RATE •. The communications (or baud) rate detennines the maximum
number of characters per second (CPS) that can be transmitted or received by the Model 820 KSR. The
communications rate applies to both transmitted and received data. Note that one (and only one) baud rate
must be enabled at all times.
21
110 baud is 10 CPS
22
200 baud is 20 CPS
23
300 baud is 30 CPS
24
600 baud is 60 CPS
2S
1200 baud is 120 CPS
26
2400 baud is 240 CPS
27
4800 baud is 480 CPS
28
9600 baud is 960 CPS
29
Auto-select is for use with Bell System 212 data sets (or equivalent) equipped with an
automatic speed selection option. The Model 820 KSR will operate at either 300 or 1200
baud, depending on the status of the reverse channel input when the call is connected; OFF
selects 300 baud, and ON selects 1200 baud.
2.9.4 PARITY (31-38) The parity selection determines how the Model 820 KSR processes the error bit of
the transmitted and received data. Parity is always added to transmitted data. The parity of received data is
either checked or ignored according to the selected parity parameter. If the parity of received data is checked;
an error is noted in one of two ways.Note that one (and only one) parity parameter must be enabled at all
times.
31
Transmit odd parity, do not check received data
32
Transmit even parity, do not check received data
33
Transmit odd parity, indication on error*
34
Transmit even parity, indication on error*
3S
Transmit odd parity, indication plus printed symbol on errort
36
Transmit even parity, indication plus printed symbol on errort
37
Transmit mark parity, do not check received data
38
Transmit space parity, do not check received data
2-10
*Indicator on error - the audible tone is sounded, and an error code is displayed.
tIndication plus printed symbol -
the audible tone is sounded, an error code is displayed, and the
erroneous character is replaced with the symbol ·:l~:
2.9.5
LINE CONTROL (61-64) The line control parameters provide several line disconnect options for
use with modem communications modes. In all cases the Model 820 KSR accomplishes the disconnect by
switching off data terminal ready (DTR) until data set ready (DSR) has been off for 3 seconds. These
automatic line disconnect features are usually enabled when the Model 820 KSR is to be used in an
unattended environment.
Note that any number of line control parameters may be enabled at any time.
61
Failsafe Disconnect, when enabled, causes the Model 820 KSR to disconnect from the
transmission line when certain abnormal conditions occur. The audible tone sounds
momentarily, and afailsafe disconnect error code is displayed to the operator. The error
display will be reset the next time the DSR signal comes on or the RESET key is actuated.
Failsafe disconnect occurs under the following conditions according to the communications mode:
Full-duplex
•
No carrier received within 22 seconds after DSR switched on (wrong-number timeout).
•
Carrier is off for 8 seconds after having been on (loss of carrier timeout).
Half-duplex
•
Carrier is off for 22 seconds after DSR comes on unless the ABM autotrigger feature is
enabled.
•
Carrier is off for 8 seconds after a line turnaround character is transmitted.
•
Clear to send (CTS) fails to switch on within 8 seconds afterrequestto send (RTS) comes on.
Half-duplex with reverse channel
•
Carrier is off for 22 seconds after circuit DSR comes on.
•
Carrier is off for 8 seconds after a line turnaround character is transmitted.
•
Carrier is off for 8 seconds after having been on, unless carrier turnoff was preceded by a
transmitted' 'break" by the Model 820 KSR or receipt of a line turnaround character.
•
CTS fails to come on within 8 seconds after RTS comes on (CTS timeout).
In all cases, thefai/safe code is not displayed ifDSR switches off before the specified timeout elapses, or if
disconnect is preceded by receipt of the configured disconnect character or character sequence.
2-11
62
Disconnect on receipt of EOT causes the Model 820 KSR to perform a line disconnect
when the control character EOT is received.
63
Disconnect on receipt of DLE EOT causes the Model 820 KSR to perform a line
disconnect when the control character sequence DLE EOT is received.
64
Disconnect on paper-out or carriage jam (when enabled) causes the Model 820 KSR to
perform a line disconnect when the terminal detects either fault condition. If parameter 64
is disabled, a busy signal is issued when either condition occurs. The busy signal depends
upon the communications mode:
•
Full-duplex - timed break pulse (256-ms spacing signal) transmitted
•
Half-duplex - no response possible; request to send will be held off following receipt
of next line turnaround character
•
Half-duplex with reverse channel - reverse channel is turned off
Enablng or disabling of parameter 64 has no effect upon the busy signal provided on the reverse channel when
operating in one of the console modes (parameters 14 and 15); conversely, parameter 64 is unaffected by
parameters 14 and 15.
2.9.6 TRANSMISSION CONTROL (71-72). The transmission control parameters provide automatic
control of the answer-back memory (ABM). Note that any number of the transmission control parameters
may be enabled at any time.
71
Auto-trigger ARM on connection causes the programmed ABM message to be transmitted
at the following times according to the enabled modem communications mode:
•
Full-duplex - 1.28 seconds after both DSR and CTS switch on. RTS is switched on
when DSR comes on. CTS ordinarily switches on simultaneously with the carrier.
•
Half-duplex - similar to full duplex except that the carrier is tested when DSR comes
on. If the carrier is off for 220 milliseconds, indicating that no carrier is being
received, RTS is switched on and the ABM message is transmitted 1.28 seconds after
CTS comes on. If the carrier is on within 220 milliseconds after DSR comes on, the
Model 820 KSR remains in receive mode until the first line turnaround. The ABM
message is then transmitted at the same 1.28-second delay after CTS switches on.
•
Halfduplex with reverse channel- identical to half duplex except that reverse channel
must be received before the ABM message is transmitted.
NOTE
In both halfduplex and halfduplex with reverse channel the ABM should be
programmed to include a line turnaround character as the last character of
the message if it is intended that the Model 820 KSR is to revert automatically to receive mode after the ABM is transmitted.
2-12
72
Enable print ofARM causes the contents of the ABM to be printed when the ABM message
is transmitted and local copy is enabled, or when the HERE IS key is actuated and the
terminal is off line.
2.9.7 TERMINAL CONTROL (81-89). The terminal control parameters enable use of certain special
features of the Model 820 KSR. Note that any number of the terminal control parameters may be enabled at
anytime.
81
Enable device and format control from the communications line permits use of the
Device/Forms Control (DFC) option by the host system; when parameter 81 is disabled,
recognition of the ESC sequences from the host system is inhibited.
82
Enable local copy of transmitted data causes all transmitted characters, except ENQ and
ESC, to be copied to the Model 820 KSR. Local copy may be enabled for any communications mode.
83
Transmit DC3 or BREAK on printer busy and DCI or LTA when ready, when enabled,
causes transmission of a busy signal when the receive FIFO is within 64 characters of being
full and a transmission of a ready signal when the receive FIFO is within 128 characters of
being empty. The busy/ready response is determined by the communications mode as
follows:
•
Full-duplex and console:
Busy - DC3 transmitted
Ready - DC 1 transmitted
•
Half-duplex:
No response possible
•
Half-duplex with reverse channel:
Reverse channel off at busy; if the carrier is still being received and no line
turnaround character has been received at ready, reverse channel is switched on
and operation continues. If the carrier has switched eff before ready, RTS is
switched on; at ready or when reverse channel comes on (whichever comes
later), the first programmed line turnaround is transmitted, and RTS is switched
off.
The status of configuration parameter 83 has no effect on the ready/busy signal provided on the reverse
channel in the transmission modes selected by parameters 14 and 15. Similarly, parameters 14 and 15 have no
effect upon the operation of parameter 83.
84
Do new line on receipt of LF causes the terminal to respond to the receipt of the LF
character by performing a carriage return and a line feed.
8S
Do new line on receipt of CR causes the terminal to respond to the receipt of the CR
character by performing a carriage return and line feed.
2-13
86
Transmit CR LF when RETURN is entered causes the terminal to transmit the CR and LF
character sequence when CR is transmitted.
NOTE
Simultaneous enabling of parameter 84 or parameter 85 with parameter 86
will cause double line feeds on data transmitted with local copy enabled.
87
Print all control characters causes all.control characters to be printed (using the character
font shown in Appendix A) to enable analysis of incoming data streams. The control
functions normally associated with these characters, including printer control functions,
will not be performed.
88
Set compress print only provides a means of locking the printer in compressed print mode
to prevent inadvertent changes of horizontal pitch which could result in printing beyond the
right edge of the form.
NOTE
The optional compressed print feature must be installed to use this
parameter; use of the compressed print parameter without the option will
cause erroneous operation.
89
Set absolute right margin at column 80 prevents inadvertent printing beyond the right edge
of the form when the Model 820 KSR is used in a network of 80-column format terminals.
2.9.8 PROGRAMMABLE PARAMETERS (ABM, LTA, ENTER). In addition to the previously
described operating parameters, the Model 820 KSR offers three programmable parameters - the answerback memory (ABM), the line turnaround characters (LTA), and the ENTER key (if the optional numeric
keypad is installed). All three parameters may be programmed from the keyboard as required.
•
Answer-Back Memory - The ABM is a unique terminal identifier which may be programmed from
one to 21 characters long. Any combination of the 128 ASCII characters may be programmed in
the ABM message.
•
Line Turnaround Characters - The LT A characters provide control of the communications line
when either half-duplex (parameter 11) or half-duplex with reverse channel (parameter 12) is
used. At least one and no more than three of the 128 ASCII characters must be programmed when
either of the half-duplex communications modes are selected.
•
ENTER Key - The ENTER key on the optional numeric keypad may be programmed to generate a
1 , 2 ,or 3 character sequence when the ENTER key is actuated. Any combination ofthe 128
ASCII characters may be used.
2-14
2.9.9 CONFlGURATlON REPORT. A printed configuration report may be obtained as
follows:
a.
Ensure that the LINE/-/LCL switch is in the LCL position and that the CONFIGURE/OPERATE
switch is in the OPERATE position.
b.
Initiate the configuration report by pressing and holding the CfRL and SHIFf keys and then
momentarily pressing the @/2 key; then release all keys.
c.
Observe that a report of the form
. NN;NN; ... NNT
is printed. The terms NN correspond to the two-digit configuration codes which are currently
active; i.e., the enabled parameters. The term T corresponds to the programmed line turnaround
characters.
NOTE
The codes 60, 70, and 80 are never reported and the LTA, ABM, and
ENTER key contents are not included in this report.
2.10 CONFIGURATION PARAMETER ENTRY
The selected configuration parameters are entered via the keyboard of the Model 820 KSR. This procedure,
called configuring the terminal, is outlined in the following paragraphs in the recommended sequence.
2.10.1 INITIATE CONFIGURATION. To initiate configuration, proceed as follows:
a.
Set the LINE/-/LCL switch to the LCL position (lower edge depressed).
b.
Lift the terminal cover and set the CONFIGURE/OPERATE switch to the CONFIGURE position
(toward the front of the terminal).
c.
Close the terminal cover .
. d.
Observe me terminal status display: The left digit is the symbolc , indicating thatthe terminal is
in the configure mode; the center and right digits represent the configuration code corresponding
to the first enabled configuration parameter.
2.10.2 REVIEW CURRENT CONFIGURATION. The current configuration (i.e., all enabled
parameters) can be reviewed by using the TAB key. Each time the TAB.key is pressed and released, the
Model 820 KSR will display the next enabled configuration parameter (the next parameter is the one with the
next higher configuration code or the lowest configuration code if none higher are enabled). Use of the TAB
key in no way affects the cUrrent configuration.
2-15
2.10.3 ENABLE MUTUALLY EXCLUSIVE PARAMETERS. Mutually exclusive parameters are
those which must be specified. The mutually exclusive parameters are
•
•
•
Communications mode codes
Communications rate codes
Parity
codes
11-15
21-29
31-38
To enable a new mutually exclusive parameter proceed as follows:
a.
Type the two-digit code corresponding to the parameter to be enabled (see Table 2-1 for a list of
configuration parameter codes, or refer to the Operator Reference Cards).
b.
Momentarily press the RETURN key.
c.
Listen for a short audible tone and ascertain that the code for the new parameter is displayed,
signifying that the old parameter has been replaced with the new.
2.10.4 ENABLE ON/OFF PARAMETERS. The ON/OFF parameters are those which modify the
operation of the terminal and are not required. Any number of the ON/OFF parameters may be enabled (or
switched ON). The ON/OFF parameters are:
•
•
•
The line control options, codes 61-64
The transmission control (ABM) options, codes 71 and 72
The terminal control options, codes 81-89.
To enable a new ON/OFF parameter proceed as follows:
a.
Type the two-digit code corresponding to the parameter to be enabled.
b.
Momentarily press the RETURN key.
c.
Listen for a short audible tone and ascertain that the code for the new parameter is displayed,
signifying that the new parameter is enabled. Note that no other parameter is affected.
2.10.5 DISABLE ON/OFF PARAMETERS. Any ON/OFF parameter that is currently enabled may be
disabled (or switched OFF). To disable an ON/OFF parameter proceed as follows:
a.
Type the two-digit code corresponding to the parameter to be disabled or press the TAB key until
the code is displayed.
b.
Momentarily press the DEL (delete) key.
c.
Listen for a short audible tone and ascertain that the code for the next enabled parameter is
displayed, signifying that the old parameter is disabled.
2-16
2.10.6 PROGRAM THE ADM, LTA, AND ENTER KEY. The programmable parameters are entered
fromthe keyboard while in the CONFIGURE mode. To program the LTA, ABM, or ENTER key proceed as
follows:
a.
Type the code corresponding to the programmable parameter as follows:
6O-line tumarourid (LTA) characters
70 - answer-back memory (ABM)
SO ., ENTER key (optional numeric keypad must be installed).
b.
Momentarily press the RETURN key.
c.
Observe that the left digit of the TSD displays I_I , signifying that the terminal is in the
programming mode, and that the other two digits displayDI, signifying that the first character of
the programming sequence may now be entered.
d.
Type any of the 128 ASCII characters. For each entry the count in the middle and right digits will
increment by one, signifying that the entry has been accepted. The maximum number of
characters which may be entered is three for the LTA, 21 for the ABM, and three for the ENTER
key.
e.
Terminate the programming sequence by (1) entering the maximum number of characters or (2)
pressing the HERE IS key.
f.
Listen for a short audible tone and ascertain that the left digit displaysc and the other two digits
displaY,the code for the next enabled parameter, signifying that the programming sequence has
been successfully completed.
NOTE
The key sequence 60 (or 70 or SO), RETURN, HERE IS may be used to
erase the corresponding programmable parameter.
2.10.7 CONFlGURATION ERRORS. Typing errors may be made during the configuration process. If
an invalid code is entered via the keyboard, the terminal will emit a long audible tone and display the code
C:'='. To recover from this condition, type the correct code (or press the TAB key) and continue the
configuration procedure. Note that no parameters are changed when a configuration error occurs.
2.10.8 TERMINATE CONFIGURATION. Before terminating the configuration mode, it is advisable
to review the current configuration by pressing the TAB key to verify that the correct parameters are enabled.
To terminate the configuration mode proceed as follows:
a.
Lift the terminal cover.
b.
Set the CONFIGURE/OPERATE switch in the OPERATE position (toward the rear of the
terminal).
2-17
c.
Close the cover.
d.
Observe that the TSD displays the column number signifying that the terminal has calculated a
checksum for the current configuration parametes and has stored the parameters and checksum in
nonvolatile memory.
2.11 COMMUNICATIONS INTERFACE CABLE CONNECTION
The Model 820 KSR is shipped with a 1.8 meter (6 foot) communications interface cable (TI part number
0993205-00(1) suitable for direct connection to Bell System type 103, 113,202, and 212 data sets. To install
the cable between the terminal and the data set, simply plug the cable into the appropriate receptacles and
tighten the mounting screws.
Refer to Figure 2-8 for other communications interface cable connections.
820 KSR
..,
(i)
DATA SET
(TYPE 103, 113,
202,212f
I
L
-.J
DATA SET CONNEcnON
COMPUTER,
TERMfNAL, ETC.
820 KSR
CONSOLE CONNECTION
3
820 KSR
990 COMPUTER
990 COMPUTER CONNECTION
LENGTH
METERS FEET
ITEM
NO.
TI
PART NUMBER
1
0993205·0001
103/113/202/212 DATA SET CABLE(STANDARDI
1.8
6,0
2
0993210·0001
DATA TERMINAL CABLE
1.8
6.0
3
2262093·0001
990 TTY/EIA TO 820 CABLE
9.0
30.0
ALSO
AVAILABLE
0993211·0001
EIA EXTENSION CABLE (25 WIRESI'
1.8
6.0
DESCRIPTION
'MAY BE USED IN ANY CONNEcnON
Figure 2-8. Communications Interface Cable Connections
2-18
Table 2-2. 113A/I03, 202/212 Data Set Cable (T1 Part No. 993205-0001)
820 Pin
P6- P7
(Male)
Data Set Pin
(Male)
RS-232-C
Circuit
1
2
1
2
AA
3
3
4
5
4
5
6
6
7
8
7
8
11
11
BA
BB
CA
CB
CC
AB
CF
SCA
12
12
SCF
20
22
20
22
CD
CE
Function
Protective Ground
Transmitted Data
Received Data
Request to Send
Clear to Send
Data Set Ready
Signal Ground
Received Line Signal Detector
Secondary Request to Send
(Reverse Channel Transmit)
Secondary Received Line Signal Detector
(Reverse Channel Receive)
Data Terminal Ready
Ring Indicator
820 PIN
P7(male)
DATA TERMINAL
PIN (female)
....
III
2
3
4
5
6
7
8
11
12
15
17
20
24
.
..
....
r
~
.
t
.
:
PIN
1
2
3
4
5
(EITHER END)
6
7
8
~
~
:
I
REFERENCE:
..
11
12
15
17
20
24
EIA
RS-232-C
CIRCUIT
AA
BA
BB
CA
CB
CC
AB
CF
SCA
SCF
DB
DO
CD
AUXLlO
20
7
4
5
12
11
17 .
15
6
FUNCTION
Protective Ground
Transmitted Data
Received Data
Request to Send
Clear to Send
Data Set Ready
Signal Ground
Data Carrier Detect
Reverse Channel Transmit
Reverse Channel Receive
Transmission Signal Element Timing
Receive Signal Element Timing
Data Terminal Ready
Auxiliary Input/Output Control
Figure 2-9. Data Terminal Cable (TI Part No. 0993210-0001)
2-19
1
3
2
8
SECTIONm
OPERATION
3.1 INTRODUCTION
This section provides a complete functional description of the Model 820 KSR, including the use of all
controls and indicators. Figure 3-1 shows the location of the major functional components of the terminal,
including the operator panel, the printer, the communications interface, and the operator reference cards.
Also discussed in this section is the operation of the various termlnal options.
3.2 OPERATOR'S PANEL
The operator's panel, shown in Figure 3-2, may be considered as four sections: the control panel, the
typewriter keyboard, the optional numeric keypad, and the CONFIGURE/OPERATE switch. The operation
of each section of the operator's panel is described in the following paragraphs.
3.2.1 CONTROL PANEL. The control panel provides various switches to permit the operator to control
th communications interface and the operation of the printer. Various indicators provide operating status
information to the operator:
3.2.1.1 LINEj-/LCL Switch. This three-position rocker switch controls the communications interface as
follows:
LINE
When the switch is set to LINE, the terminal is in the LINE mode (or on-line) and data
may be interchanged with other devices in the system. Data received from the host
system via the communications interface is printed, and data entered on the Model
820 KSR keyboard by the operator is transmitted to the host system via the
communications interface.
-(standby)
When the switch is in the center position, the terminal is in the STANDBY mode and
no data may be interchanged with the host system. Data received from the host
system via the communications interface is ignored. Data entered on the Model 820
KSR keyboard by the operator is printed but not transmitted. When in the STANDBY
mode, the Mooel820 KSR will maintain connection to the host system (similar to a
telephone on "hold").
LCL (local) -
Whenthe switch is set to LCL, the terminal is in the WCAL mode and no data may be
interchanged with the host system. Operation in the WeAL mode is identical to the
STANDBY mode, except that connection to the host system is not maintained.
3.2.1.2 VIEW/OFF Switch (Last Character Visibility). This two-position rocker switch controls the
last character visibility feature of the Model 820 KSR. When set to the VIEW position, the printhead will
move to the right to make v~sible the last character printed. A pointer on the left side of the printhead indicates
the position where the next character will be printed. While the switch is in the VIEW position, the receipt of
any printable character will cause the printhead to return to its previous position to print that character; after
the character is printed, the printhead will again move to the right if no more characters are received within 1
second.
3-1
3-2
CONFJGUREJOPERATE SWlTCH
r-------IiT--+--VT-----+FORM+__
E3
~~~
llNE
(S
CARli
'"
0
-S S
LCONTROL
--MARG1NS---+I-~PACE-----1
B
0
GJ
§.D'
PANEL~ -~-----TYPEWRITER
LI
KEYBOARD-----------.JI
L
NUMERIC KEYPAD
(OPTIONAL)
~
Figure 3-2. The Operators Panel
When the switch is placed in the OFF position, the printhead will return to its previous position to print the
next character and will not move to the right to permit visibility of the last character.
NOTE
The pointer affixed to the printhead is accurate only when the printhead has
moved to the right to allow last character visibility .
3.2.1.3 LINE RDY and CARR RCV Indicators. These two light-emitting-diode (LED) indicators
provide operating status information for the communications interface. The LINE RDY (line ready) indicator
shows the status of the data set ready (DSR) interface signal and the transmit circuitry; the CARR RCV
(carrier received) indicator shows the status of the data carrier detect (DCD) interface signal. Table 3-1
defines the operation of these two indicators.
3.2.1.4 Terminal Status Display (TSD). This three-digit numeric display provides several operating
indications, including next character position, current line number, status, and configuration and
progr.amming modes.
•
Next Character Position - The TSD normally displays the next character position; that is, if a
character was just printed in column 67, the TSD will displayGbEf . When indicating the next
character position, the display will always show a number between 001 and 133.
•
Current Line Number - If the device/forms control option is installed in your Model 820 KSR, the
TSD can be converted from a next-character-position indicator to a current-line-number indicator.
When used as a current-line-number indicator, the left digit of the TSD will be blank and the other
two digits will coritain a line number between 01 and 84.
3-3
•
Status - The TSD functions as a status indicator when an error condition or a special operating
condition exists. When operating as a status indicator, the TSD will flash on and off, the left digit
will contain the symbol::J , and the other two digits will display one of the status codes listed in
Table 3-2.
Table 3-1. LINE RDY and CARR RCV Indicators
COMMUNICATION
MODE
CARR RCV INDICATOR
OFF
ON
Half Duplex
Full Duplex
Receive not
ready;
transmit
available
Ready
to
Receive
LINE RDY INDICATOR
ON
FLASHING
In standby
or
transmit
requested
but not
ready
Receive not
ready;
no
carrier
Comm
line
ready
In standby
or
dataset
failure
OFF
Commline
not
connected
Table 3-2. Status Codes
TYPE
CODE
I
00
01
02
03
II
10
11
12
III
20
21
22
23
24
25
29tt
IV
30
31
39
V
:J:J
ACTION REQUIRED
DEFINITION
Memory Failure
RAM memory
ROM memory I
ROM memory II
Nonvolatile memory
Operator Correctable
Leaving configure mode
with half-duplex set,
but no LTA specified
Carriage jam
Paper-out
Abnormal Communications
Clear-to-send timeout
Loss-of-carrier timeout
Wrong number timeout
Receive Buffer overflow
Parity error
Transmit buffer overflow
Invalid EXC sequence
from communications line
Special Operating Mode
Keyboard locked
Printer off
Test in progress
Operator Error
Invalid ESC sequence
from keyboard
Equipment problem: Cycle power. If condition repeats, call for
service.
Go to CONFIGURE mode and specify LTA character or set fullduplex operation.
Clear jam and re~el
Load paper and reset
Reset"
Reset"
Reset"
Resett
Reset/Change Parityt
Resett
t
From line or reset
From line.or reset
Reset
Reset and type valid command
sequence
* Automatically reset when data-set-ready comes on (repetition could indicate data set failure); associated with failsafe disconnect parame
tAutomatically reset when status report transmitted per request from line: See DFC Option.
ttThis code is not displayed, but it is transmitted as part of the status report: See DFC Option.
3-4
The status codes are prioritized in ascending numeric order; that is, code 00 is assigned the highest
priority and 39, the lowest. When multiple status codes are active, the highest priority code (i.e.,
the lowest number) will be displayed until it is cleared by pressing RESET; then the next highest
code will be displayed.
•
Configuration and Programming Modes. Use ofthe TSD, in conjunction with the configuration
and programming modes, is explained in paragraph 2.10. In summary, a C displayed in the left
digit indicates the configuration mode, and a '-' displayed in the left digit indicates the
programming mode.
Table 3-3 summarizes the TSD functions.
Table 3-3. Interpreting Tenninal Status Display (TSD) Functions
a. Print Column/Current Line Indicator
.-------------11 0 or 1 -
indicates the next print position
blank - indicates the current line number
~
~L/_'
C_I___----!I
__
I
The next position to be printed or the current line number
I
t
b. Status (Display Flashing)
~r------------
~L/_'
'_~_' ___.JI
__
I
___
I
Indicates that error or special mode condition exists
Status code
+
c. Configure Mode
~r------------
~L-_/
__'__
__.JI
I_'_· __
I
Indicates the model 820 KSR is in CONFIGURE mode
Configuration code
t
+
d. Program Answer-Back Memory (ABM),'Line Turnaround (L TAl Character(s), or ENTER Key Sequence
r-r-----------,
~I
~
Ie
[
Indicates the model 820 KSR is in CONFIGURE mode, and programming
of the ABM, LTA or ENTER key sequence is in progress
I'
,,<""'~
"~, 3 max. for LT A or ENTE
'"""~OO
{21
max.
<
DISPLAY (TSD)
CONTROL
KEYBOARD
CONTROL
REPORT
CONTROL
LINE FEED
Spacebar
PA\
PB\
PC\
PD\
PE\
PF\
COMMAND
DEFINITION
-
Set single space print (6 lines/inch)
Set double space print (3 lines/inch)
Set standard wklth print (10 char/inch)
Set compressed width print (16.5 char/inch)"
Tum printer OFF (DO NOT print received dataO
Turn printer ON (print received data)
b
Set terminal status display = current line
Set terminal status displav - next column
Lockout the keyboard
Unlock the keyboard
Ic
In
Transmit configuration reportt
Transmit status reportt
,
"00 not issue a command to set compressed print unless the compressed print option is installed; erroneous terminal operation will result.
tTransmitted Reports Have the Following Formats:
ESC[820;C1 ;C2; .... ;CNcX
Configuration:
Status:
EXC[820;C1 ;C2; .... ;CNnX
Where C is a 2 Digit Configuration/Status Code
And X Represents the LTA Character (If Present)
3.5.2 COMPRESSED PRINT. The compressed print option provides printing at a 16.5 characters per
inch (CPI) pitch in addition to the standard 10 CPI pitch. The 16.5 CPI pitch permits printing full 132-column
lines on 215.9 mm (8.5 inches) wide forms. (Maximum line length is 132 columns, regardless of pitch).
With the compressed print option installed compressed printing may be selected from the keyboard as part of
the configuration procedure by enabling parameter 88. If the device/forms control option is installed, pitch
also may be selected using the appropriate ESC sequences entered from the keyboard or received from the
communications line, provided the terminal is not configured with the parameter 88 set (compressed print
only). For satisfactory operation horizontal pitch changes should be made only at the beginning of a new print
line.
IMPORTANT NOTE
Selecting compressed print operation, either by configuration code or DFC
command, on a terminal without the compressed print option will cause
abnormal printing operation.
3-19
Table 3-7. Forms Control Commands
COMMAND
TYPE
FORMS
COIIIIAND SEQUENCE
(ESC FOLLOWED BY:)
KEYBOARD ENTRY
RECEIVED DATA
5N;
[Nt
5;
50;
FORMS
MARGINS
6
7
8
9
0
[Ns
[;Ms
[N;Ms
1
H
[M1;···;Mnu
2
[Og
[2g
[M'
[Ma
VERTICAL
TABULATION
Set top of fonn at present line with
N = fann length (1 to 84)
Set top of form at present line
Set bottom of fann at present line
Set left margin at present column
Set right margin at present cokmn
Set top margin at current line
Set bottom margin at current line
Set left margin at column 1; set right margin at
column 132*; set top margin at line 1 and set
bottom margin = FORM LENGTH.
[Nr
[;Mr
[N;Mr
HORIZONTAL
TABULATION
C~AND
DEFINITION
3
J
[N1;···;Nnv
4
[1g
[4g
[Nd
[Ne
Set top margin at line N (N = 1 to 84)
Set bottom margin at line M (M = 1 to 84)
Set top margin at line N, bottom margin at line M
(1 sNsMs84)
Set left margin at column N (N = 1 to 132)
Set right margin at column M (M = 1 to 132)
Set left margin at column N, right margin at column
M(1 sNsMs132)
Set TAB stop at present column
Set TAB stops at columns indicated
byM1 to Mn (M = 1 to132;ns16)t
Clear TAB stop at present column
Clear all horizontal TAB stops
TAB right to column M (M = 1 -132)
TABM columns to the right (M = 1 -132)
Set TAB stop at current line
Set TAB stops at lines indicated by N1 to N n
(N = 1 to84;ns16)t
Clear TAB stop at current line
Clear all vertical TAB stops
Advance to line N (N = t to 84)
Advance N lines from current line (N = 1 to 84)
"If configuration parameter 89 is enabled. the right margin is set at column 80.
tAlthough the maximum number of tab stops which may be set with a single command is 16. tab stops may be set at all locations by using multiple commands.
3.5:3 USER-DEFINED CONFIGURATION SETS. Configuration codes 01 through 08 are reserved in
the Model 820 KSR for user-defined configuration options. A choice of two configuration options is
available; each option enables the user to predefme up to eight, complete, configuration parameter sets. The
two configuration options are
•
Defawtconfigurationoption
•
Protected configuration option.
The default configuration option consists of from one to eight predefined terminal configuration sets which
must be specified when the Model 820 KSRis purchased. Each of these sets is permanently stored in an
inalterab,le memory (read-only type) supplied as part of the option. The currently selected set may be
modified if desired, via the keyboard while in ihe CONFIGURE mode, by enabling or disabling any of the
parameter codes. The selected set, including any parameter code changes, is stored in nonvolatile memory
for retention when power is switched OFF.
The protected configuration option consists of from one to eight predefined terminal configuration sets which
must be specified at the time of purchase. Each of these sets is permanently stored in an inalterable memory
(read-only type) supplied as part of the option. No parameter changes are possible when this version of the
option is installed. The selected set is stored in nonvolatile memory for retention when the power is switched
off.
To select a configuration set, proceed as follows:
a.
Enter the CONFIGURE mode as described in paragraph 2.10.1.
b.
Type the two-digit codes corresponding to the desired set.
c.
Momentarily press the RETURN key.
d.
Listen for an audible tone and ascertain that the code just entered is displayed, signifying that the
previous configuration has been replaced with the new set.
e.
Terminate the CONFIGURE mode as described in paragraph 2.10.8.
For both the protected and default configuration options any attempt to select a configuration for which no
parameter set is defined will cause a configuration error status. If either configuration option is installed, the
terminal will default to the configuration set defined by code 01 (rather than the standard default
configuration defined by code 09) upon failure of the power-up diagnostic test of nonvolatile memory.
3.5.4 ALTERNATE CHARACTER SET - ASCll/APL. The optional APL keyboard shown in
Figure3-5 enables the terminal to transmit and receive both the standard ASCII and the APL characters. The
SO-SI/LOCK switch and ALTN CHAR indicator shown in Figure 3-6 are added to the control panel with this
option installed. The SO-SI/LOCK switch, in conjunction with the 0, N, and CTRL keys and the control
codes SI and SO, permit selection of either the APL or the ASCII mode. With the SO-SI/LOCK switch in the
SO-SI position and the terminal in the LCL mode, APL mode is selected by pressing the N key while the
CT~ key is pressed and held [which generates the control character SO (shift out)]. The ALTN CHAR
(alternate character) indicator lamp will light to signify that the terminal is in the APL mode. The terminal
may be switched to ASCII mode· by pressing and holding· the CTRL key and pressing the 0 key, which
generates the control character SI (shift in) and causes the ALTN CHAR indicator lamp to extinguish.
With the terminal in LINE mode,the APL/ASCII mode may be selected from the keyboard only if local copy
aftransmitted data (parameter 82) is configured. Otherwise, the terminal will respond only to SO and SI
characters received from the communications line. If fixed mode operation (always APL or always ASCII) is
3-21
KEYTOP LEGEND
...
. 1\
APL SHIFTED CHARACTER
X r - A P L UNSHIFTED CHARACTER
:!:~ASCII SHIFTED CHARACTER
-~ASCII UNSHIFTED CHARACTER
Figure J,;,5. APL Keyboard
required, the desired mode is selected while the terminal is in LCL mode and the SO-SI/LOCK switch is
placed in LOCK position. With the switch in LOCK position, the terminal will ignore SO and SI characters
whether generated from the keyboard or received from the communications line.
LINE
ALTN
RDY
CHAR
o
LINE
.tj
LCL
o
CARR
RCV
o
a tj
SO-51
VIEW
LOCK
OFF
Figure 3-6. Control Panel, USASCII/APL Option
3.5.5 NUMERIC KEYPAD. An optional 18-key numeric keypad is available for high volume data entry
applications. Since the numeric keypad must be physically mounted on the main keyboard printed-wiring
circuit, this option is usually factory installed. Field upgrade requires replacement of the keyboard assembly.
3-22
Numeric keypad layout and symbolization are shown in Figure 3-7. The keypad is available on the standard
ASCII and on the optional APL keyboards. The ENTER key is user-programmable as described in Section II.
None of the keys on the numeric keypad have automatic-character-repeat operation. The mode control keys
(i.e., SHIff, UPPER CASE, and CfRL) of the typewriter keyboard have no effect on the numeric keypad
functions.
Figure 3-7. Numeric Keypad
3.6
OPERATOR'S REFERENCE CARDS. A set of Operator Reference Cards is contained in the
pull-tab tray located at the front left corner of the terminal. These cards provide a summary of the operational
features of the Model 820 KSR terminal.
3-23
SECTION IV
THEORY OF OPERATION
4.1 GENERAL
This section describes the theory of operation of the Model 820 KSR tenninal. The Model 820 KSR consists
of the following major functional components:
•
•
•
•
•
•
•
•
•
•
Power supply
Terminal controller
Operator Interface
Communications interface
RibbOn drive subsystem
Terminal controller/printer controller interfac~
Printer controller subsystem
Paper drive subsystem
Printhead carriage drive subsystem
Printhead.
A block diagram illustrating the relationship of the functional components is shown in Figure 4-1.In addition
to the simplified diagrams accompanying this discussion, the text also lists references to the logic diagrams
and schematics reproduced in Section vn of this manual. On the logic diagrams a signal is considered active
when it is high (logic ONE) unless a slash (/) appears before the mnemonic, in which case it is considered
active when it is low (logic ZERO). The mnemonics for all signals are listed in Appendix F of this manual.
POWER
SUPPLY
COMMUNICATIONS
INTERFACE
OPERATOR
INTERFACE
. t--
RIBBON
DRIVE
TERMINAL
CONTROLLER
I-
PAPER
DRIVE
PRINTER
CONTROLLER
I-
PRINTHEAD
PRINTHEAD
CARRIAGE DRIVE
Figure 4-1. Model 820 KSR, Simplified Functional Block Diagram
4-1
4.2 POWERSUPPLY
The Model 820 power supply operates on a self-referencing power conversion principle. The self-referencing
power converter operates over an input voltage range of 90 to 280 Vac at a frequency range of 47 to 400 Hz.
Jumpers on the terminal electronics printed-wiring board switches the terminal from 115 Vac to 230 Vac
operation.
The self-referencing power supply consists of six major parts:
•
Input voltage selection and rectification
•
Soft-start circuit
•
Blocking oscillator
•
Reference/sense circuit
•
Secondary filtering and regulation
•
Power good circuit.
A simplified block diagram of the Model 820 KSR power supply is shown in Figure 4-2. Schematics of the
power supply are shown on sheets 13 and 14 of drawing 999692 in Section VII.
SNUBBING
C!RCUIT
I
I
POVVE~
GOOD
CI'1CUIT
TO
r-- INTERRUPT
LOGIC
I
I
I
I~"PUT
VOLTAGE
AND
'1ECTIF!CATION
I
r-
SOFT START
CIRCUIT
I--
BLOCKINCi
OSCILLATOR
TRANSFORMER
COUPLED
I
I
I
I
OFF TIME
AND
CURRENT
LIMITING
CI'1CUIT
I---
ON TIME
AND
SUMMING
CIRCUIT
SECONDARY
FILTERING
AND
'1EGULATION
I
OPTICALLY
COUPLED
'1EFE'1ENCE
SENSE
I
PRlr,1ARY SECTION
SECONDARY SECTION
Figure 4-2. Power Supply Block Diagram
4-2
TO
t--- LOAD
4.2.1 INPUT VOLTAGE SELECTION AND RECTmCATION. Power is supplied through
the line ftlter and power-on switch (drawing 999883, sheet 1) to E271 and E281 (drawing 999692,
sheet 13). If the tenninal is conftgured for 115 Vac operation, jumpers are installed from E279 to
E280 and from E275 to E276 to form a voltage doubler as shown in Figure 4-3. For 230 Vac
operation jumpers are installed from E273 to E274 and from E277 to E278 to form a full wave
bridge as shown in Figure 4-3. The jumper between E285 and E286 acts as a switch to indicate the
input voltage conftguration to automatic test equipment. Capacitor C262 is an ac bypass from the
325 Vac return to chassis ground, and J202 is a connector provided for future optional equipment
(see drawing number 999692, sheet 13). Capacitors C258 and C259 provide the primary energy
storage for the terminal.
325 VDC
CR266
AC LINE
+
C258
+
C259
F250
E271 0 - - - - - -.....
CR264 E27J _ E280
AC COMMON
E281o---------------+---~
CR265
325 VDC RETURN
A) (115 VAC) VOLTAGE DOUBLER CONFIGURATION
325 VDC
\
CR266
AC LINE
E277
I
E278
CR264
+
C258
+
C259
F250
E271
E281
E2850
AC COMMON
.... b
CR263
E286
CR265
,E274
'E273
325 VDC RETURN
B) (230 VAC) FULL WAVE BRIDGE CONFIGURATION
* SOFT START COMPONENTS
NOT SHOWN
Figure 4-3. Input Voltap Selectioll aDd Rectiftcation
4-3
4.2.2 SOFT-START CIRCUIT. During power-up initial current surge is limited by resistor
R271 in the soft-start circuit as shown in Figure 4-4. After a safe period, when capacitors C258
and C259 are charged, SCR Q255 fIres and bypasses R271 for more efficient operation. Resistors
R269 and R270 with capacitor C261 provide the RC time constant delay used to fIre the soft-start
SCR. R268 and C260 fIlter the voltage on the gate of Q255. CR262 provides a low-impedance
path around R271 when C258 and C259 discharge.
p----------------------------,
325 Vdc - - -__
R270
CR262
R271
260
325 Vdc RETURN
Figure 4-4. Soft-Start Circuit
4-4
C261
4.2.3
BLOCKING OSCILLATOR CIRCUIT. The blocking oscillator circuit (drawing
999692, sheet 13) is a self-starting switching circuit which uses the primary winding of transformer T201 as a collector load. When the switching transistor is on, energy is stored in the
primary winding of transformer T201. When the switching transistor goes off, the induced
electromgnetic field in the primary collapses and couples energy into the secondary windings of
the transformer.
Transistor Q250 controls the current being applied to the primary winding ofT201. When Q250 is switched
on, current passes through the primary winding of T201 and current sensing resistor R251. Transistor Q251
follows the voltage changes of R251 and applies a ramp voltage proportional to the current change through
R251 to a summing point at R259.
The summing point receives the ramp voltage from Q251 and from the reference sensing circuit connected to
the secondary windings ofT201. When the voltage at this summing point reaches approximately 0.6 volts,
transistors Q252, Q253, and Q254 switch on which, in turn, switches off Q250. The current through the
primary of T201 stops, and the induced field begins to collapse. The collapsing field couples energy to the
secondary windings through flyback action. Q250 remains off until the voltage at the summing point allows
transistor Q252 to switch back off.
Two jumpers are provided in the blocking oscillator circuit to assist in testing. The jumper between E264 and
E265 connects the collector of Q250 to T20 I. The jumper between E262 and E263 connects the base of Q250
to the self-starting circuit R265.
4.2.4 REFERENCE SENSING CIRCUIT. The 5-volt winding rectified by CR205 (drawing 999692, sheet
14) is used as the reference winding. Because of the tight coupling used in the secondary windings of T20 I,
any load variations in the other secondaries will be reflected in the 5-volt winding. The 5-volt output is tapped
off before fuse F200 and applied to pin 2 of operational amplifier (op-amp) U202. The output of the 5-volt
winding is compared to a reference voltage developed across CR20 I. When the input to pin 2 of the op-amp is
less than the reference voltage, the output of the op-amp is high, and switching transistor Q250 continues to
deliver full power into the primary winding. When the input at pin 2 exceeds the reference voltage, the output
of the op-amp is optically coupled back to the summing point at R259 where it is combined with the ramp
voltage to switch off transistor Q250.
4.2.5 SECONDARY FILTERING AND REGULATION CIRCUITS. Transformer T201 has four
secondary windings which are used to produce the voltages required to drive the terminal. The windings
produce 33 volts, +5 volts, and ±16 volts. The +33 volt winding is rectified by CR203 and then split to
fac~litate testing the motor driver and printhead circuits. The jumper from E205 to E206 connects + 33 volts
to +33 VHD which applies +33 volts to the ribbon motor drive through fuse FIOI and to the printhead
through fuse F102. The jumper from E207 to E208 connects + 33 volts to + 33 VMTR which applies +33
volts to the carriage motor drive and papermotor drive through fuse FI03.
The output of the + 5 volt winding is rectified by CR205, filtered, and sensed by the reference/sensing circuit.
The + 5 volt supply is split after fuse F200 to facilitate testing of the driver and logic circuits. The jumper from
E212 to E213 connects +5V to the logic circuits. The jumper from E213 to E214 connects +5V to +5 DVR
for the motor driver circuits and is used to develop +5 VSW (drawing 999692, sheet 7).
4-5
The 16-volt secondary rectified by CR 209 is filtered and input to the three-tenninal regulator U205; this
output is the regulated + 12 volt supply for the tenninal. The second 16-volt winding is filtered and regulated
by regulator U206; this produces the -12 volt supply for the tenninal and the input to regulator U204. The
output of U204 is the - 5 volt supply for the tenninal.
4.2.6 POWER-GOOD CIRCUIT. The power-good circuit (PWRGOOD) monitors the power supply
voltages and produces a logic output signal that enables terminal operation. If either of the power supply
voltages (+5 or -12) drops to less than 95 percent of its nonnal voltage output, transistor Q201 (drawing
999692, sheet 14) switches on, sinking the PWRGOOD signal to ground. The loss of the PWRGOOD signal
causes a RESET interrupt to the tenninal processor (TMS 9980) and disables all printer mechanism drive
circuits by disabling the +5 VSW drive enable signal.
4.3 TERMINAL CONTROLLER SUBSYSTEM
The Model 820 KSR terminal controller is a TMS 9980 microprocessor. A simplified block diagram of the
tennial controller subsystem is illustrated in Figure 4-5. The tenninal controller works in a master-slave
relationship with the printer controller (TMS 9940); that is, the TMS 9980 controls the TMS 9940. The major
components of the tenninal controller sybsystem are
•
TMS 9980 microprocessor
•
System clock and interrupt logic
•
Memory control logic
•
Memory.
,.... TO PRINTER CONTROLLER
FROM KEYBOARD -
FROM I/O ----I~
INTERRUPT
LOGIC
MEMORY
CONTROL
LOGIC
9980
CLOCK
AND
POWER-UP
LOGIC
MOTOR
INTERFACE
LOGIC
1 - - - _ RIBBON MOTOR
Figure 4-5. Tenninal Controller Simplified Block DiIIp'am
4-6
MEMORY
4.3.1 TMS 9980 MICROPROCESSOR. The TMS 9980 is a single-chip 16-bit microprocessor which
accepts four levels of interrupts. The TMS 9980 has an eight-bit bidirectional data bus and a 14-bit address
bus, permitting addressing a maximum of 16,384 bytes (eight bits per byte) of memory. The TMS 9980
utilizes a versatile I/O interface called the communications register unit (CRU). The CRU can address up to
2,048 devices external to the TMS 9980.The CRU provides serial data outputs on CRUOUT which is
connected to each device that is to receive data or commands from the TMS 9980. Each time a data bit is
transmitted on the CRUOUT data path, an address appears on the CRU address lines. (Note that since the
CRU address lines are also used to address memory locations, /MEMEN is inactive during CRU operations).
The CRU bus is composed of the CRU address lines (AO-A12) and CRUOUT (A13). All external devices
connected to the CRU bus have an address decoder to gate the data from CRUOUT. When a decoder detects
its own address, data on CRUOUT is accepted at CRUCLK. Conversely, if the address on the CRU bus is not
correct for a particular device, its decoder ignores the data on CRUOUT.
Data from devices external to the TMS 9980 is also accessed by the CRU. The CRU input operation is
essentially identical to the CRU output operation; the main difference is that when an external device
recognizes (i.e., decodes) its address on the CRU address lines, it places the data on the CRUIN line and this
line is read by the TMS 9980.
4.3.2 TERMINAL CONTROLLER MEMORY. The memory used by the terminal controller subsystem
is composed of
•
Read-only memory (ROM)
•
CMOS random access memory (CMOS RAM)
•
Random access memory (RAM)
•
Programmable read only memory (PROM)
The terminal controller memory schematics are located in Section VII, drawing 999692, sheets 4 and 5. The
references in the following paragraphs apply to these schematics.
4.3.2.1 Read Only Memory. The control programs and built-in testing functions for the standard Model 820
KSR terminal are contained in 8K bytes of read only memory (ROM) located on the terminal electronics
PWB(lower PWB). The terminal controller ROM consists of two 4K by 8-bit TMS 4732 ROM devices
installed in sockets XU9 and XUlO. Data is exchanged with the ROM's via the TMS 9980 bidirectional data
bus. The ROM's are enabled by the memory control logic (refer to paragraph 4.3 .3) and are addressed via the
TMS 9980 address lines. An additional TMS 4732 ROM (socket XUII) is provided with the Device/Forms
Control (DFC) option.
4.3.2.2 Nonvolatile Memory. The Model 820 KSR uses a complementary metal oxide semiconductor
(CMOS) random access memory (RAM) and a battery to provide nonvolatile storage of configuration and
format parameters. The CMOS RAM contains 256 bytes of memory and is located on the terminal electronics
PWB (U12 and U13). The CMOS RAM is enabled by the memory control logic. When power to the Model
4-7
820 KSR is switched off, a + 3 volt, silver oxide battery provides power to the CMOS RAM (refer to Section
V for information on battery installation and replacement.)
4.3.2.3 Random Access Memory. The terminal electronics PWB has 1,024 OK) bytes of RAM for
temporary storage of data and workspace for data processing by the TMS 9980. The terminal processor RAM
consists of two lK by 4-bit TMS 4045 RAM devices in U4 and U5. The RAM is enabled by the memory
control logic.
4.3.2.4 Programmable Read Only Memory (Optional). The terminal electronics PWB provides two
programable read only memory (PROM) sockets, XU2 and XU3, which are used for optional character sets
and ftxed conftgurations. Refer to Section III for details on these options.
4.3.3 MEMORY CONTROL LOGIC. The memory control logic enables the TMS 9980 to address all
memory chips on the terminal electronics PWB through the use of select signals. The select signals are
created by a 256 by 8-bit PROM located at U25. The five most significant address lines (AO-A4), BWE
(buffered write enable), DBIN (data bus input), and BMEMEN (buffered memory enable) select a memory
location in the PROM. The contents of the selected address produce one of eight select signals. Refer to
Section VII, drawing 999692, sheet 4, which contains a truth table for the memory control PROM. The truth
table infers that when anyone memory is selected, all other memories are disabled. When the /BMEMEN
signal is high, indicating that the TMS 9980 is performing a nonmemory function, all outputs of the PROM
are high; hence, all memory chips are disabled. The BWE andDBIN inputs to the PROM have two states
listed for both RAMSEL (RAM select) and CMRAMSEL (CMOS RAM select); two states are necessary
because the RAM and CMOS RAM can be used to store data (BWE) as well as read data (DBIN).
4.3.4 SYSTEM CLOCK AND INTERRUPT LOGIC. The terminal electronics PWB employs a to-MHz
crystal-controlled oscillator to provide the clock pulses for the Model 820 KSR. The output of the system
clock is buffered and input to pin 34 of the TMS 9980. The clock for the Printer Controller (TMS 9940) is
provied by applying the output of the to-MHz oscillator into a divide-by-two device (U44) to produce a
5-MHz output.
The TMS 9980 can accept four levels of interrupts and a RESET. The RESET has the highest priority and is
always honored above all other processor actions. A RESET interrupt results when the PWRGOOD input
from the power supply switches to a low state, indicating that power has been interrupted. The level-l
interrupt is used for automatic system tests at the factory. The level-2 interrupt indicates that the TMS 9940
has acknowledged the transfer of data from the TMS 9980. The level-3 interrupt is used for communications
interrupt from the TMS 9902. The lowest level of interrupt, level 4, indicates an interrupt from an optional
auxiliary port interface. Refer to drawing 999692 for schematics of the interrupt logic.
4.4 OPERATOR INTERFACE
The upper PWB of the Model 820 KSR terminal contains the operator interface which consists of the
alphanumeric keyboard, the operator control panel, the terminal status display, terminal indicators, and
asociated support circuits. The operator interface components are connected to the terminal controller
processor through the keyboard interface (drawing 999692, sheet 6). The keyboard scan, matrix, terminal
status display and indicators, and the interface logic are described in the following paragraphs.
4-8
4.4.1 KEYBOARD/SWITCH SCAN. The keyboard is scanned once every four milliseconds. During each
scan the keyboard matrix is read, the terminal indicators are updated, and one of the seven-segment LED
displays on the operator's panel is updated. Three keyboard scans are required to completely update the
keyboard displays. At the beginning of the keyboard matrix scan, the terminal controller loads a digital word
into the shift registers in the interface logic. This word places a ZERO on row zero (RO) and a ONE on rows
one (Rl) through row eleven (Rll). Therefore, at the beginning of the scan, only row RO is enabled. After
reading the column outputs, the registers are right-shifted, meaning that only Rl is now enabled. The
columns are read again. The shift registers are right-shifted every time the columns are read until all of the
rows have been enabled once.
4.4.2 KEYBOARD MATRIX. The keyboard matrix encodes key/switch actuation information to be read
by the terminal controller. The matrix consists of twelve rows and eight columns that are part of the PWB
(drawing 999822, sheet 2). The rows are enabled (low) one at a time by the terminal controller. When a key
connected to an ·enabled row is actuated, current flows through the 6.8K ohm pull-up resistor, through the
key/switch, through the diode, and into the enabled row (see Figure 4-6). While the current is flowing, the
column output will be low.
The diode prevents current flow from an unenabled row to an enabled row when two switches on the same
column are actuated. The output of each matrix column is fed into a voltage comparator (U2, U3; drawing
999822, sheet 1). The reference voltage for the comparator is taken from a voltage divider. The reference
voltage should be about 1.74 volts. The output of the voltage comparator is routed through J 1 to the keyboard
interface logic. The row inputs from J1 are bufferd through two hex bus drivers (U7, U8; drawing 999822,
sheet 1).
ROWO------~~--------_+----------~----------+_----------
ROW1
--------~--------_+----------~----------+_----------
6.8K
n
- - - - " V\r---o 5 V
COLUMN 0
6.8K Sl
t---'vv'\r----o 5 V
COLUMN 1
Figure 4-6. Keyboard Matrix Simplified Diagram
4-9
4.4.3 TERMINAL STATUS DISPLAY AND INDICATORS. The tenninal status display (TSD) is
controlled by rows RO-R3 and R9-RII. Outputs R9-RII strobe the seven-segment LED displays by
forward-biasing transistors Q 1, Q2, Q3. These three transistors supply the current to the common-anode
segment LED diodes of the display. The display is driven by a BCD-to-seven-segment decoder/driver (VI;
drawing 999822, sheet 1). The four inputs (A-D) for the decoder/driver are RO-R3, respectively (see Figure
4-7). The other terminal indicators are controlled by R5-R7 and are activated by enabling their respective row
(low).
4.4.4 KEYBOARD INTERFACE. All references in this subsection apply to drawing 999692, sheet 6. The
keyboard interface connects the data bus of the terminal controller processor to the row inputs and the column
outputs of the keyboard. The keyboard interface also connects the data bus to the ribbon motor drive inputs.
The data bus is an eight-bit bidirectional bus. The terminal electronics PWB, which includes the keyboard
interface logic, is connected to the keyboard PWB by a 25-conductor ribbon cable (the center conductor is not
used). A simplified block diagram of the keyboard PWB is shown in Figure 4-8.
The keyboard interface logic is controlled by the eight inputs. The /IOSEL input enables the entire interface
logic when active (low). The BA5 input enables the ribbon motor drive interface logic when active (high) and
enables the row and column interface logic when inactive (low).
The rows are interfaced by three, 4-bit, parallel access, shift registers (V34, V35, V36). The registers are
parallel-loaded by applying the data to the data bus, activating /BMEMEN (low), and making a high-to-Iow
transition on /BWE. If BCRVOUT is high, the data is clocked onto RO-R7; and if it is low, the data is clocked
onto RS-R 11.
L'5V
~Q1
3.3K
ROW 11
~m
A5T2907
A5T2907
3,3K
ROW 10
ROW 9
ANODE
.--U1
,
ROINa - A
I
b
TO KEYBOARD
ROW 1 - 6
ROW BUffERS
ROW 2
-C
c
~
~
z
~
ROW 7
ROW 6
-
ROW 5
l
I
TI L312
M.S,O
ANODE
II
U5
TI L312
ANODE
II
U6
I
TI L312
LSD
d
e
r---,
270Q
:Ff1
. ROW 3 - D
U4
rt
A5T2907
}.3K
"\IV'.
'Yjlll I
l
I
.'III
•I
III
Q~
!
Figure 4-7. Tenninal Displays, Simplified Diagram
4-10
I
CRn
Tll220
270H
G~CR73
TIL220
2 70il
Gv
CR74
TIL220
-
0
......
TERMINAL STATUS
DISPLAY (TSDI
0100""(,0
a: a: a: a: a: a:
I
1I
r
-
-
--
I- I I- I I- I
I--I I- I I--I
I
.-~
(:J
w
en ~
L-~
L-I...-
t:
0
u.
co
'-STBD
STBl
STB2
"----- RD
Rl
R2
R3
R4
R5
KEYBOARD
R6
MATRIX
R7
R8
R9
,.....
~
R1D
Rll
CD Cl C2
\.
1
RDY
11
ALTN
CHAR
CARR
RCV)
r
T
C3
1
C4 C5 C6 C7
II
I
1JLL LL11
TERMINAL INDICATORS
Figure 4-8. Keyboard PWB Simplified Diagram
After the output of the columns is scanned, the output of the shift register is right-shifted. Shifting is
accomplished by making /BMEMEN inactive (high), activating KBDENA (high), and making a low-to-high
transition on BCRUCLK. The serial input on the shift register which outputs RO-R3 is tied high. This shifts
high data into the register .
The columns are interfaced by two, 3-state hex bus drivers (U37 and U38). The column outputs are read onto
the data bus line by activating /DBIN (low).
The ribbon motor drive is interfaced by a hex, D-type flip-flop. Data from data lines DO-3 is clocked onto the
flip-flop when /IOSEL is low, BA5 is high, BCRUOUT is low, and a high-to-Iow transition is made on
/BWE.
4-11
4.5 COMMUNICATIONS INTERFACE
The communications interface, controlled directly by the TMS 9980, utilizes a TMS 9902 Asynchronous
Communication Controller as well as CRU-addressable inputs and outputs. All communications interface
input signals are converted from EIA/C.C.I.T.T. levels to TIL levels as described in EIA standard
RS-232-C. The communications interface logic is shown on drawing 0999692, sheet 7, and discussed in
Section 3.
4.5.1 INTERFACE SIGNALS. The Model 820 KSR terminal supports the communications interface
signals described in Section 3.4 of this manual. All communication interface signals are routed from the
25-pin connector mounted on the rear of the terminal to connector 13 on the terminal electronics PWB by the
internal ElA cable assembly (drawing 0999742). The signals in this cable are designated by both the EIA and
C.C.I.T.T. circuit names. For example, the received data signal is designatedBB/J04.
4.5.2 SIGNAL-LEVEL CONVERSION. All inputs from 13 are converted from EIA/C.C.I.T.T. levels to
TTL logic levels by the logic elements in locations U47 and U49. All outputs to 13 are converted from TIL
logic levels to EIA/C.C.I.T.T.levels by the logic element in location U46.
4.5.3 ASYNCHRONOUS COMMUNICATION CONTROLLER. The TMS 9902 Asynchronous
Communication Controller (ACC) transmits and receives asynchronous, serial data and provides the
interface signals data set ready (DSR), request to send (RTS), and clear to send (CTS). The character
structure of the transmitted and received data is shown in Figure 4-9.
All remaining interface signals are under direct control of the terminal controller via the CRU interface,
utilizing the input device in location U45 and the output device in location U30.
4.6 RIBBON DRIVE SUBSYSTEM
4.6.1 RIBBON MOTOR DRIVE. The terminal processor also controls the speed and direction of the ribbon
drive motor. The ribbon drive motor is a four-phase pulse-modulated device operated in a stepping motor
unipolar, single-phase, voltage-switched mode. The motor steps each time a different phase winding is
energized. The ribbon motor drive circuit (drawing 999692, sheet 11) receives the inputs to the phase
windings, ROA-ROD, from a latch connected to the buffered data lines of the TMS 9980.
l n- r-r -. ,- -r-l r~START BIT
8 BITS
+v--
-v - -
,
rI -
,
,_ ,
,
,
,
I
L_
1 _1. _1. _
:1
----1--4
-r
-,,
,
,
I
J.. _
L
LSB
STOP BIT (2 STOP
BITS AT 110 BAUDJ
-SPACE· BINARY 0
,
I
I
_ L. _
MSB
L\..:.-__
MARK - BINAR'Y 1
PARITY BIT
AOOO1251
Figure 4-9. Asynchronous Data Fonnat
4-12
Clockwise rotation of the motor is induced by the following sequence:
Tcw = ROA
ROB
ROC
ROD
ROA
Counterclockwise rotation is ob~ained by the following sequence:
Tccw = ROA
ROD
ROC
ROB
ROA
Each motor phase is switched between + 33 volts and ground using a four-stage monolithic Darlington
amplifier. For eXarr1ple~ motor detent at RPHSA is achieved with ROA at a logic ONE. Current is sourced to
the base of the Darlington at input pin 6. The emitter-to-base (VBE) of the Darlington clamps at approximately 1.5 volts. When saturated, the Darlington switch clamps the output (pin 7) to approximately 1 volt.
When logic input ROA is returned to a logic ZERO, the Darlington is switched off and the inductive flyback
diode is clamped at approximately 1 volt above the supply voltage. The magnetic detent will maintain the
rotor at RPHSA detent until one of the phases is energized.
4.6.2 RIBBON MOTOR DIRECTION. Ribbon motor direction is determined by the order in which the
phase windings are energized. The ribbon mounted on the ribbon drive continues to move in one direction
until the ribbon supply reel is almost empty, at which time an eyelet in the ribbon actuates the ribbon reverse
switch (RIBREVSW) located on the ribbon drive deck. When the switch is actuated, a signal is applied to a
Schmitt trigger (drawing 999692, sheet 8) which is applied to tristate buffer U45 and read into the TMS 9980
on the CRUIN line. When the TMS 9980 detects RIBREVSW switch actuation, it reverses the order in which
the phase windings of the ribbon motor are energized and the motor reverses direction.
4.7 TERMINAL CONTROLLER/pRINTER CONTROLLER INTERFACE
The TMS 9980 terminal controller serially transfers operands to the TMS 9940 printer controller over the
CRUOUT line of the TMS 9980. The TMS 9940 gates in one bit of data from the TMS 9980 each time the
TMS 9940 CRUTC input is toggled by the TMS 9980 CRUCLK output. When all 16 bits of the command are
transferred to the TMS 9940, the TMS 9980 sends an interrupt which causes the TMS 9940 to transfer the
command from its multiple processor system interface (MPSI) register into its internal RAM. The TMS 9940
acknowledges the transfer by sending an interrupt back to the TMS 9980.
Figure 4-10 illustrates the signals necessary to transmit commands to the TMS 9940. The TMS 9980 places
the first command data bit to be transferred on the CRUOUT line; at the same time address lines A5 and A7
are set high (logic ONE) and A6 is set low (logic ZERO). This combination causes U20 to set low the MPSI
output which is passed through an inverter and is applied to an AND gate along with the CRUCLK signal.
Each time the CRUCLK line is pulsed, a CRUTC signal is applied to the TC input of the 9940.
When all 16 bits of the command have been transferred, the 9980 sets the A 7 line low, activating SLINT2
(slave interrupt 2). The SLINT2 signal causes an interrupt on the INT2 (interrupt 2) input of the 9940. When
the data from the MPSI register has been transferred to internal RAM and the command has been completed,
the 9940 sends an interrupt back to the 9980 on its MSINTlline. This interrupt is received by the 9980 as a
level-2 interrupt, completing the transfer of one command.
4-13
~
....
.,
=
IJC
~
"'...."
?
.,--3
9....
=
e:..
I
II
A5,A6,A7.1BMEMEN
BCRUCLK
~
~l
r--I
TMS
9940
CRU
DECODE
-.,
~
::r
.,
-=....
-.,
- -g.,
=
-.,
11
/CRUTC
-.
TACH PULSE
/lNT2AK
TERMINAL
CONTROLLER
TMS 9980
~
lSLI NT2
/INT2
LATCH
!SOLENOIDUSOLENOID
LATCH
:
DRIVERS
CHARACTER BUS
BCRUOUT (SERIAL 16 BIT DATA)
n
=
=
CHARACTER
GENERATOR
ROM
4
PRINTER
CONTROLLER
TMS 9940
DIRECTION INDICATOR
~
SLERRCD
COMPRESSED/NORMAL
~
~
I
(j
j
::r
-.,
~
~
DIRECTION
MSINTAK
~
IMSINTQ
LATCH
MSINTl
~
rJJ
!
~ ACCELERATION
f---
SO
t'l
S·
"S'......
4-PHASE MOTOR
CONTROL
~~
CURRENT
CONTROL
~
PAPER
MOTOR
DRIVERS
==
~
ill':'
t':'
.,
a
DRIVE ENABLE
CONTROL
4 CURRENT
LEVELS
I-- I-- f---
Q..
~.
~
!
CARRIAGE
MOTOR
AND
SENSOR
4.8 PRINTER CONTROLLER SUBSYSTEM
The printer controller subsystem (TMS 9940 emulator), also referred to as the slave MPU, is a 16-bit
microcomputer. The TMS 9940 single-chip microcomputer is, at the date this manual was printed, in the
final stages of development. Its functions are currently performed by an emulator. All references to the
printer controller (TMS 9940) in this section apply to the emulator in those terminals with an emulator, and
apply to the TMS 9940 single-chip device in terminals so equipped. Both printer controllers function
identically.
The TMS 9940, itself controlled by the terminal controller, controls all functions of the printer mechanism
except the ribbon drive motor and paper-out detection. The earlier printer controller (emulator) is contained
on two PWB' s. The later single-chip TMS 9940 printer controller is installed in socket U 17 of the terminal
electronics.
Figure 4-10 illustrates the relationship between the printer controller, the terminal controller, and the printer
mechanism. The slave printer controller receives commands from the terminal controller to print characters,
feed the printing paper, or move the printhead. The printer controller programs, stored in ROM, provides the
printer controller the instructions necessary to decode commands from the TMS 9980 and send, in turn, t4e
appropriate control signals to the printer mechanism.
The printer controller is responsible for the following functions:
•
Printhead positioning and velocity control
•
Detection of carriage jams
•
Character printing
•
Paper (forms) feed.
The printer controller positions the printhead via a carriage powered by a dcservo motor. Direction and
acceleration signals from the printer controller provide the input to the carriage motor; tachometer feedback
from the motor completes the servo loop. Characters to be printed and the column position where the
characters are to be printed are sent from the 9980 to the 9940. The printer controller decodes and develops
the necessary information to be input to a character ROM. The output of the character ROM provides the
input to the printhead drivers. A four-phase paper drive motor controlled by the printer controller is used to
move the paper vertically either up or down. Carriage jams are detected through a time-out sequence by the
printer controller.
When the Model 820 KSR is powered up, the terminal controller performs a series of automatic diagnostic
tests. When the diagnostics are complete, the 9980 sends a DRIVENA (drive enable) signal to U43 (refer to
drawing 999692, sheet 7). DRIVENA is ANDed with the PWRGOOD (power good) signal from the power
supply. If the DRIVENA and PWRGOOD signals both ate active, the network of Q 1, Q2 and Q3 produce the
+5VSW signal which enables all drive circuits discussed herein. Without the +5VSW'signal the printer
mechanism driver circuits remain disabled.
4-15
+5VSW signal which enables all drive circuits discussed herein. Without the +5VSW signal the printer
mechanism driver circuits remain disabled.
4.9
PAPER DRIVE SUBSYSTEM
4.9 .1 PAPER MOTOR DRIVER CIRCUIT. The printer controller receives paper motion commands from
the TMS 9980 terminal controller. The printer controller decodes the commands and develops the necessary
signals required to drive the paper motor. The paper motor is a four-phase, permanent magnet, stepping
motor. The speed of the motor is determined by the speed at which the phase signal input (POA-POD) from
the printer controller causes the motor to step. Motor direction is determined by the order in which the motor
phase windings are enabled. Each eight steps of the motor will cause the paper (form) to advance (or reverse)
one line.
The phases are enabled in pairs for stepping motion. When a phase line goes high, it switches on the
appropriate transistor which supplies current to the selected phase winding in the motor. The current enters
the motor through pins 1 through 4 of 1104 and returns through pins 1,3,4, and 5 of 1106 (drawing 999692,
sheet 10). For example, phase A and phase B are both on; after a period of time determined by the printer
controller, phase A is switched off and phase C is switched on. The motor rotates one step at that time. When
phase B is switched off, phase D is switched on, producing another motor step.
When the motor is not stepping, a detent or holding torque is requird to lock the motor at the position at which
it stops. The detent signal is enabled by the PDMCC (paper drive motor current control) line from the printer
controller. By applying higher current to the two-phase windings of the stepper motor enabled by the phase
signal input from the printer controller, the stepper motor is electrically "locked" into the last stepped
position. When the PDMCC line is disabled, the current through the selected phase windings will return to the
stepping level, and the stepping motor will begin to step when the phase signals begin to change.
The paper motor driver operates as a current-controlled, switching mode regulator in an integrating choke
circuit configuration. The current consists of a current-sensing comparator U 113; motor phase selector Q 116,
Q114, Q117, or Q115; and a power switch Q113. When PDMCC is low, a detent motor current is
established; when PDMCC is high, the motor current is increased to a level sufficient to develop motor torque
to meet the worst~case friction torque. Clockwise rotation is induced by the following sequence (based on
single-phase drive):
Tcw=POA
POB
POe
POD
POA
Counterclockwise rotation is induced by the following sequence:
Tccw = POA
POD
POe
POB
POA
For example, after power becomes good the +5VSW signal goes high and one or more motor phases can be
selected. If POA is high, the Darlington transistor Ql16 is switched on, which switches on transistor Ql19,
causing Ql13 to switch on and saturate. This causes current to be input to motor winding PDRV and out
PPHSA, where it is sinked by transistor Q116. When sufficient motor current is flowing, the voltage
developed across resistor R133 will cause the comparator to change states, causing Ul13-7 to go low. This
4-16
action switches off Q 119 which removes the base drive from Q 113. Motor current will now flow from the
anode of CR116, through PDRV, through PPHSA, through Q1l6 and sense resistor R133. The circuit
exhibits a long recovery time in this mode. As the current flowing through R133 decays, the voltage drop
acrpss R133 decreases until, eventually, the comparator will return to the original state, permitting U113-7 to
go high, which switches on QI19 and Q113.
The loop continues operating in a self-oscillating, chopping mode as long as one of the phase-select inputs is
enbled. As in the above example in which Q116 is switched off, QI13 switches off, providing the motor
winding inductance a fast recovery path through CR 116, through PDRV, through PPHSA, the zener CR 117 ,
CR 132, and through CR 124. Circuit operation is similar for any of the other selected phases. If more than one
phase is selected at a time, the current will divide approximately equally through the windings.
4.9.2 PAPER-OUT DETECTION. When the paper-out switch (PAPOUTSW) in the printing mechanism
is actuated, indicating that there is no paper in the mechanism, a Schmitt trigger produces an input to the
tristate buffer U45 (drawing 999692. sheet 8). The paper-out signal is then read by the 9980 on the CRUIN
line, and the 9980 displays an error code on the terminal status display. Operation cannot be restored until the
switch is opened; that is, paper is installed in the mechanism.
4.10 . PRINTBEAD CARRIAGE DRIVE SUBSYSTEM
4.10.1 PRINTHEAD POSmONING. The TMS 9980 is responsible for determining the position at which
a character is to be printed. and the 9940 is responsible for determining which direction.the printhead must
move to accomplish a 9980 command. The printer controller selects direction of printhead travel only for
incremental printing. When higher speed printing requires bidirectional printing, the 9980. determines
printhead direction for printing.
The character and position commands from the 9980 are sent serially to the printer controller via the CRU.
The printer controller responds to the position commands by sending a direction signal and one of four
possible acceleration commands. Motor direction is selected by the CMFWD (carriage motor forward) line.
The acceleration of the motor is determined by the ACC! and ACC2 lines; these two lines provide four
posible combinations of acceleration commands. Since carriage motor acceleration is a function of motor
current, the acceleration signals cause the motor driver circuit to act as a selectable, constant-current source
for the carriage motor. Table 4-1 lists the current output of the motor driver circuit for all four acceleration
combinations.
The printer controller is responsible for mairitaining the appropriate motor speed for the function commanded
by the TMS 9980. By comparing the time between tachometer signals with a reference, the printer controller
determines which acceleration signals are required to maintain correct printhead travel speed.
Motor speed and direction digital control signals· from the printer controller are converted to analog drive
signals by the Model 820 KSR carriage motor driver circuit (drawing 999692, sheet 9). Motor direction is
changed by reversing the motor voltage polarity with the CMFWD line. When the CMFWD line is high (logic
ONE), driver transistor Q 105 is switched on and driver transistor Q 106 is switched off. If the CMFWD line is
low (logic ZERO), indicating a reverse motor command, Q105 is off and QI06 is on.
4-17
TABLE 4·1. MOTOR DRIVER ACCELERATION CONTROL OUTPUT
ACCl
ACC2
Motor Current (Amperes)
0
0
0.00
0
I
0.66
I
0
1.43
I
I
2.86
The carriage motor driver circuit is a constant-current switching regulator. Current for the carriage motor,
when it is moving the printhead forward (left to right), is supplied by the +33 volt motor supply, through
QlO8 (which has been switched ON by QlO5), through the motor winding (CMTRA to CMTRB) , and to the
motor return line via Qll0 and current sensing resistor R125. If the motor is commanded to travel in the
reverse direction (right to left), the current path is now through QI09, the motor winding (CMTRB to
CMTRA) , Qlll, and to sensing resistor R125. The appropriate curentpath is selected by the CMFWD line.
The current sensing resistor R 125 produces an output proportional to the amount of current passing through
it. As the amount of current passing through R125 increases, the voltage drop across it increases. This change
is level shifted and input to pin 2 of voltage comparator U 113. The acceleration signals from the TMS 9940
provide a different reference to voltage comparator U 113 for each combination received. The output of this
comparator controls transistor Q 107 to provide current regulation switching for the carriage motor.
The motor draws current through current sense resistor R125 until the voltage drop across it produces a
difference signal into comparator U 113. When this occurs, Q lO7 is switched off which switches off the driver
transistor (QlO5 if forward direction or QI06 if reverse direction). When the current is switched OFF, the
voltage drop across R125 decreases and comparator UI13 switches QlO7 back ON. This, in tum, switches
ON the appropriate driver transistor, and the drive voltage is again applied to the carriage motor. The result is
a constant-current source which is regulated by the voltage reference selected by the TMS 9940 acceleration
signals.
The carriage motor is coupled with an optical tachometer assembly mounted on the rear of the motor casing.
The tachometer assembly is an integral part of the motor and cannot be removed. The tachometer
optoelectrics are supplied with a +5 volt supply through J5 (drawing 999692, sheet 8). The output of the
normal print tachometer is TOA I and TOB 1 which is fed to Schmitt trigger circuits and through the
compressed print option selection logic. The output of the selection logic is two pulses displaced 90 degrees
from each other. The printer controller clock (f994OCLK) gates the pulses into latch U42 and PROM U41.
The resulting output is a pulse on the SENSOR line that represents 0.2158 mm (8.33 mils) of printhead
movement in normal (not compressed) print mode and a signal (DIRECT) that indicates printhead direction
of travel. A logic high on the DIRECT line indicates printhead travel from left to right and a low represents
travel from right to left.
4-18
The TMS 9940 printer controller maintains a printhead position counter in its internal RAM. Each time the
SENSOR line is pulsed, the INTI interrupt flip-flop (drawing 999692, sheet 8) is set, which presents an
interrupt to the printer controller. The printer controller clears the interrupt with the INTIACK (interrupt 1
acknowledge) line. The register containing the printhead position is incremented or decremented (depending
upon the direction the printhead is traveling) with each INTI pulse.
The printer controller initially determines (upon power-up) printhead position by moving the printhead to the
left margin. Once the printhead has positioned itself to the left margin the printer controller uses the
tachometer feedback from the carriage motor to determine where the printhead is at any given time. When the
terminal is powered-up, the printer controller must assume the printhead has been able to move to the left
margin.
NOTE
If the printhead is obstructed when the terminal is powered-up, the printer
controller will assume the position where the printhead stopped is the left
bumper. This will cause all future printhead position information to be
incorrect. If this occurs, remove the obstruction and cycle the power off and
on.
4.10.2 CARRIAGE JAM DETECTION. Carriage jams are detected by the printer controller. When the
carriage motor circuit receives acceleration signals to move the printhead, the printer controller monitors the
sensor pulses from the terminal electronics PWB interface logic and starts a timer. If the printer controller
does not receive tachometer pulses within a specified time, a SLERRCD (slave error code) signal is sent to
the TMS 9980 on the CRO bus. The TMS 9980 is then interrupted by the TMS 9940 and a carriage jam error
code is displayed on the TSD. The audible tone is sounded for 1 second to alert the operator to an error.
4.11 CHARACTER PRINTING
The printer controller receives single-word commands from the 9980, indicating what characters are to be
printed. The 9940 operating system decodes the commands and generates a series of sequential addresses
which are applied to the character generator ROM located at 016 (drawing 999692, sheet 8). Each address
selected by the 9940 address lines (CGAO - CGAll) produces an eight-bit digital word at the output of the
character ROM. The output of the character ROM is gated into latch 015 with each SENSOR pulse. After the
contents have been in the latch 400 microseconds, the latch is cleared by the SLERRCD line.
The eight-bit digital output of the latch makes up one of the nine columns used to create a character by the
impact printhead. Each character is composed of nine seven-dot columns as illustrated in Figure 4-11 which
shows how the letter "E" is printed. The printhead prints one seven-dot column at a time. As the printhead
travels along the form, each column is printed until all nine columns for each character are printed. The dot
patterns for characters printed are illustrated in Appendix A. Dot patterns used with the various international
keyboard options are also shown in Appendix A.
The eight-bit digital output of the latch (SFI-SF8) is sensed by the printhead driver circuit (drawing 999692,
sheet 12) which closes the path for the selected solenoids in the printhead. Each transistor (0102 and 0103)
acts as a switch for a solenoid in the printhead. Each solenoid controls one wire of the seven in the printhead.
4-19
When an input is enabled, the circuit is closed and the selected wire impacts the printing paper through the
ribbon. The eighth input to the printhead driver (SF8) is an enabling line and must be enabled for the printhead
to function. Each time a column is to be printed the SF8 line must be enabled. Current regulation for the
printhead solenoids is provided by transistors Q101 through QI04 with comparator U107 providing current
regulation switching control to QI04. Diodes CR105 through CRill provide flyback protection from the
printhead solenoids when the circuit is opened.
PRINT
WIRES
PRINTHEAD
JEWEL
COLUMNS
1
2
3
4
5
~
2
3
en
4
w
Z
:::;
5
6
7
3
5
7
iii i i 'i
11
1
_H:LF~~~_UMNS8_"'I
I I ; I I 1111
IIIIIIIIIIIIIIIIIIIIIIIIIII
°14---14
2
SHAFT ENCODER DISPLACEMENT PULSES
A0001508
Figure 4-11. Printing The Letter "E"
4-20
SECTION V
MAINTENANCE
5.1
INTRODUCTION
Preventive maintenance procedures for the Model 820 KSR and the use of the self-test functions to isolate
faults to a replaceable assembly are explained in this section. The procedures for removal and replacement of
the electronic and mechanical assemblies of the Model 820 KSR, as well as methods of adjustment, are also
described.
5.2 PREVENTIVE MAINTENANCE
A preventive maintenance schedule and the methods for perfonning the necessary scheduled maintenance are
presented in the following paragraphs.
WARNING
Verify that power has ~n removed from the terminal before performing any maintenance (except self-tests).
5.2.1 PREVENTIVE MAINTENANCE SCHEDULE. To ensure satisfactory operation of the Model 820
KSR in nonnal service, the following schedule must be followed:
Procedure
Period
Vacuum the printhead area
Every month
Oil the top guide rod and clean ribbon guides and lower guide rod
Every 2 months
5.2.2 VACUUM THE PRINTHEAD AREA.
a.
Switch the tenninal power OFF.
b.
Raise the tenninal cover by grasping the left and right front comers and lifting up until the cover
stops.
c.
Carefully vacuum the paper chaff from the printhead and the ribbon path (see Figure 5-1).
d.
Close the tenninal cover and press down on the front comers to snap shut the closures.
5-1
5.2.3 OIL TOP GUIDE ROD AND CLEAN RIBBON GUIDES AND LOWER GUIDE ROD.
WARNING
Do not use cleaning agents containing chlorinated hydrocarbons, such as
carbon tetrachloride.
a.
Switch the tenmnal power OFF. Refer to Figure 5-1 for the location of the components mentioned
in the following steps.
b.
Clean both the top and bottom guide rods and all ribbon guides with a clean cloth dampened with
denatured alcohol (TI part number 02300(7).
c.
Lubricate the top guide rod only with oil supplied in the Model 820 KSR maintenance kit (service
kit TI part number 994472).
d.
Manually slide the printhead carriage back and forth several times to lubricate the printhead
carriage bearings.
'~
PRINTHEAD CARRIAGE
BEARINGS
~
TOPGUI~D
Q
BOTTOM GUIDE ROD
~
RIBBON PATH AREA
FWD
Figure 5-1. Printhead Area, Guide Rods, and Ribbon Guide
5-2
5.3 SELF-TESTS
The Model 820 KSR provides automatic self-test functions to verify correct terminal operation. Two
- types of self-tests are built into the Model 820 KSR:
•
Power-up diagnostic tests
•
Maintenance tests.
5.3.1 POWER-UP DIAGNOSTIC TESTS. The following sequence of tests is performed automatically by
the Model 820 KSR, in the order indicated, each time power is applied to the terminal.
5.3.1.1 Indicator Test. The indicator test is initiated at the beginning of the power-up sequence. The LED
indicators switch on, and the terminal status display (TSD) shows 888. The indicator test continues until the
power-up sequence is complete (approximately two seconds).
5.3.1.2 RAM Test. The terminal main processor exercises its random access memory (RAM) to verify that
data can be written to (recorded) and read (played back) from each memory location. A checkboard pattern is
written and read, followed by writing and reading of an inverted checkerboard pattern. If an error is detected,
a RAM failure error code is activated and is displayed on the TSD. The processor proceeds to the next test,
but there is no assurance that subsequent test results are valid if this test fails. (Note: a small portion of the
RAM, required to execute the test program, is not tested by the checkerboard pattern).
5.3.1.3 ROM Test. The terminal controller performs a cyclic redundancy character check (CRC) of its
standard read-only memory (ROM), plus any installed optional ROM's. The internal ROM of the printer
controller processor and the character generator (dot table) ROM are not tested. If the result of the CRC test is
unsatisfactory, a ROM failure error code is activated and displayed on the TSD. The processor proceeds to
the next test, but subsequent test results may not be valid if this test fails.
5.3.1.4 Nonvolatile Memory Test. The terminal controller computes the checksum of the contents of the
nonvolatile memory (configuration and format parameters). If an error is found, the processor reloads the
configuration memory with default configuration and format parameters, and a nonvolatile memory error
code is activated and displayed.
5.3.1.5 Audible Tone Test. Upon completion of the memory tests and memory initialization, the audible
tone is sounded for 80 milliseconds. The terminal controller and printer controller circuits then execute a
power-up sequence. The last portion of the sequence causes the printhead to align to the left margin.
If any power-up test failures occurred, the audible tone will sound for 1 second, and the appropriate error
code(s) will be displayed in the TSD. In either case the LED indicators assume their normal status.
5.4 MAINTENANCE TESTS
The maintenance tests must be manually initiated from the keyboard. Two maintenance tests may be
performed on the standard Model 820 KSR terminal:
•
Barberpole test
•
Communications test.
5-3
5.4.1 BARBERPOLE TEST. The barberpole test causes the printer mechanism to print all 95 characters of
the standard character set in a repetitive' 'barberpole" pattern at maximum print speed. The pattern is printed
within the defined margins.
To exercise the terminal logic to the fullest extent possible, the test pattern is generated by the terminal
controller, transmitted, and looped back internally (inside the EIA interface circuits and any optional line
interface) from the terminal transmitter output to the terminal receiver input before printing.
The barberpole test may be initiated using the following procedure:
a.
Set the LINE/-/LCL switch to LCL.
b.
Simultaneously press the CTRL, SHIFT, and 1 keys. The terminal will respond by printing the
barberpole pattern and displaying a status code 39 (test in progress) on the TSD.
c.
Terminate the test by pressing the RESET key.
Figure 5-2 shows an example of the barberpole test in standard (10 CPI) and compressed (16.5 CPI) character
spacing.
5.4.2 COMMUNICATIONS TEST.
5.4.2.1 Using EIA Plug.
NOTE
This test helps to isolate communications problems whether within the
Model 820 KSR terminal or outside the terminal.
The communications system of the terminal can be tested by using a test plug that connects to the EIA port in
the rest of the terminal. The plug accepts the signals from the transmit side of the terminal and returns the
same signals to the terminal receiver. The procedure for using the test plug is as follows:
a.
Set the CONFIGURE/OPERATE switch (on the keyboard under the terminal cover) and verify
that the following terminal parameters are set:
-
Full duplex reverse channel ON forteady (configuration code 14)
-
Baud- any baud rate.
b.
Set the CONFIGURE/OPERATE switch to OPERATE.
c.
Insert the test plug (TI part number 999925-000 1) into the communications interfac'e connector at
the rear of the terminal.
5-4
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10123456789:;(=)?@ABCDEFGHI.JKLMNOPQRSTUVWXYZt\]A_'abcdef9hijklmnoP"Ir-st
0123456789: ; <=>?@ABCDEFGHI.JKLMNOPI:;lRSTUVWXYZt\] .... _ 'abcdef9hiJ k 1 mnoP"Ir-stu
123456789:;<:=>?@ABCDEFGHI.JKLMNOPQRSTUVWXYZt:\]A_'abcdef9hijklmnopqr-stuv
23456789: ; <=)?@ABCDEFGHI.JKLMNOPQRSTUVWXYZC\J"_ 'abcdef9h iJ k 1 mnopqr-stlJvlIJ
3456789:;(=>?@ABCDEFGHI.JKLMNOPQRSTUVWXYZt:\JA_'abcdef9hijklmnoP"Ir-stuvlIJX
456789:;<=>?@ABCDEFGHI.JKLMNOPQRSTUVWXYZt\J~_'abcdef9hijklmnopqr-stuvlIJXY
56789: ; <=>?@ABCDEFGHI.JKLMNOPQRSTUVWXYZ[\J ...... _ 'abcdef9h iJ k 1 mrlopqr-stlJVIIJXYZ
6799: ; <=>?@ABCDEFGHI,JKLMNOPQRSTUVWXYZ[\J"_ 'abcdef9hij k 1 mnopqr-s tUVIIJXYZ {
789:;(=>?@ABCDEFGHI.JKLMNOPQRSTUVWXYZ[\J"'_'abcdef9hUklmnoP"Ir-stuvIIJXyz{1
,89:;<=:>?@ABCDEFGHI.JKLMNOPQRSTUVWXYZr\J"_'abcdef9hiJklmnopqr-stuvlIJxyz{l}
9: ; <=>?@ABCDEFGHI.JKLMNOPQRSTUVWXYZt\J .... _ 'abcdef9h i j k 1 mrlopqr-stuvlIJXYZ {l }: ; <=:>?@ABCDEFGHI.JKLMNOP!~RSTUVWXYZC \ J'" _ 'abcdefgh iJ k 1mnopqr-stlJvlIJXYZ { I }A. STANDARD PRINTING TEST
-./01~789: ; <=)~IEFGfI~xy2[\lA
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!atsU/()I+,-./Ol23456789:;(=)?!ABC
!al$%l'()I+,-./0123456789:i(=)?tA8CD
123456789:;<=)?tA8CDEFGfI~XYZ[\]"'_'abcdtf'hi,ikllllo~rst~{:} .. !al$%l'()I+,-./Ol234S6789:;<=)~
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!atsll'()I+,-./0123456789:;(=)?lA8CDEFG
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STATUS CODE 02 ON TSD
U11
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STATUS CODE 03 ON TSD
3 PRINT QUALITY
Ufj'-n PRINT'MISSII\J(; DOTS
1 PRINTHEAD TO PLATEN
ADJUSTMENT
2. WORN OUT RIBBON
3. RIBBO~J NOSE GUIDE
ADJUSTMENT
1
'}
1
MISSING CHM"ACTERS
PAPER FEU)
4
f--
,
NO PAPER FEED, BUT
CARRIAGE DRIVE OK
3
NO PAPER FEED, AND NO
CARRIAGE DRIVE
3
1
2
1
. NUMBER IN BOX INDICATES PROBABLE ORDER OF FAILURE
2
CHECK CONNECTIONS J6
AND J106
(;)
PROBABLE AREA
OF
FAILURE
v:
<:J
a
J[!
"<
a
"-
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~
I-
5. RIBBON DRIVE:
INOPERATIVE
6. UNIT OVERHEATS
-
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CHECK CONNECTIONS
J6 AND Jl01
CHECK FAN CONNECTION
J203
1
VI
CHECK XU17 PLUG
CONNECTOR AND SENSOR
(J8) CONNECTIONS
I
o
7. PRINTHEAD STOPS
CHECK ALL GROUND
CONNECTIONS ON KEYBOARD
AND MAIN ELECTRONIC PCB
8. ERRATIC OPERATIONS
(CHARACTERS PRINTED
WITHOUT KEYS BEING
DEPRESSED, RIBBON RUNS
CONTINUOUSL Y
9. FAN STOPPED
10. CARRIAGE MOVES AND
STOPS
REMARKS
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FAILURE
CATEGORY
(;)
0
1
2
11 . PAPER FEEDS OUT OF
TRACTORS
"NUMBER IN BOX INDICATES PROBABLE ORDER OF FAILURE
CHECK FOR FROZEN FAN
MOTOR
2
1. CLEAN AND LUBRICATE
CARRIAGE RODS
2. PRINTHEAD TO PLATEN
ADJUSTMENT
1
1
2
ADJUST LATERAL TRACTOR
TENSION (R.H. TRACTOR):
CHECK PAPER BOX ALIGNMENT WITH CHUTE
TABLE 5-2. OPTION PROM/ROM PART NUMBERS AND LOCATIONS
Option
TI Part Numbel'
Logic PWB (999694-0001)
Device
Socket
DFCOption
0996750-0004
ROM
XUlI
User-Defined Configuration
0999935-0001
0999935-0001
PROM
PROM
XU3
XUSO
(Spare)
(European Character Sets)
SeeTableC2
See Table C2
PROM
PROM
XU2
XU40
(Spare)
TABLE 5-3. STRAPPABLE OPTION ON LOGIC PWB (999694-0001)
Option
Jumper Location
To connect signal ground to
chassis ground
E222 toE223
To isolate signal ground from
chassis ground (STANDARD)
E221 toE222
5-11
5.6.2 REMOVAL AND REPLACEMENT OF THE KEYBOARD PLENUM. Remove the keyboard
plenum as follows:
a.
Unplug power cord.
b.
Lift open the terminal cover.
c.
Remove the keyboard bezel by grasping the extreme right and left edges and lifting up.
d.
Manually move the printhead to the right approximately 4 inches to the right of the center of the
platen.
e.
Using a standard slot screwdriver, disengage the four retainer clips at the front of the keyboard
plenum.
f.
Grasping the right and left front edges of th~ keyboard plenum, raise the front of the plenum
approxmately 10 degrees to clear the clip latches.
g.
While supporting the plenum at approximately 10 degrees, disengage the three rear latches
beginning with right rear latch.
h.
Lift the plenum clear of the terminal with slight forward motion and set it aside.
Replace the keyboard plenum as follows:
a.
Verify that the printhead is positioned approximately 4 inches to the right of the center of the
platen.
b.
Verify that the cable from the mechanism to the PWB is routed correctly and secured properly.
c.
Grasp the edges of the plenum and insert the rear of the plenum between the printhead and cables,
ensuring that the plenum fits over the rear fan plenum housing.
d.
Lift the front of the fan plenum approximately 10 degrees and insert the three rear tabs into their
respective slots inside the terminal.
e.
Gently push the front of the fan plenum down until it rests on the four front retaining tabs.
f.
Using a standard slot screwdriver, engage the retaining tabs into their respective latches.
g.
Replace the keyboard bezel and close the terminal cover.
5-12
5.6.3 REMOVAL AND REPLACEMENT OF TIlE FAN ASSEMBLY. Remove the fan assembly as
follows:
a.
Unplug power cord.
b.
Remove the terminal cover as described in subsection 5.6.1.
c.
Remove the keyboard plenum as described in subsection 5.6.2.
d.
Using a standard slot screwdriver, remove the single retaining screw located on top of the fan
plenum.
e.
Move the rear of the fan plenum toward the front of the terminal to remove it from under the hinge
nut plate. Disengage the feet and lift the plenum up and to the left to remove it from the base.
NOTE
Observe the routing of the fan cable so you can reinstall it the same way.
f.
Disconnect the fan cable (connector P203) at J203 on the PWB and remove the cable from the
snap-in type routing guides.
g.
Using a standard slot screwdriver, remove the two mounting screws and lift out the fan assembly.
h.
Slip the fan motor out of its bracket.
Replace the fan assembly as follows:
a.
Install the fan motor into the fan bracket.
b.
Mount the fan bIicket with the two mounting screws while tightly grasping the bracket around the
fan motor with needlenose pliers. Make sure that the fan blade can rotate freely before securing the
two mounting screws.
c.
Reroute the fan assembly cable on the logic PWB as it was originally routed.
d.
Reconnect connector P203 to the PWB.
e.
Repl~ce the fan plenum and the fan plenum retaining screw (ensuring that the two bottom plenum
feet are engaged with the base slots and secured with the hinge nut plate).
f.
Replace the keyboard plenum as described in subsection 5.6.2.
g.
Apply power and verify operation:
h.
Replace the terminal cover as described in subsection 5.6.1.
5-13
5.6.4 REMOVAL AND REPLACEMENT OF TIlE KEYBOARD ASSEMBLY (Keyboard PWB or
Emulator Decremeotor PWB's).
a.
Unplug power cord.
b.
Lift the tenninal cover.
c.
Remove the keyboard bezel by grasping the extreme right and left edges and lifting up the
bezel.
d.
Remove the keyboard plenum as described in subsection 5.6.2.
e.
Remove the 33 mm (l ~ inch) wide sheet metal ground strap attached to the front left comer
of the keyboard PWB by pulling it down and away from the plastic connector.
f.
Loosen the four keyboard PWB keepers along the rear edge of the PWB, using both hands to press
in at the base of the keepers while lifting the keyboard slightly.
g.
For Emulator and Decrementor PWB removal, disconnect connectors P1Ot, PI06, P105, PI04,
P6 and P8 from the Logic PWB (the PWB at the base of the case).
h.
Lift the tach motor cable, paper drive motor cable, and ribbon drive motor out of their cable
retainers on the right side of the case.
i.
Remove the 25-conductor ribbon cable from its connector on the Keyboard PWB.
j.
Snap the keyboard keepers up and away from the keyboard.
k.
Lift the keyboard assembly up from the rear and remove the Keyboard PWB out of its
plastic mounting assembly .
.I
If the Emulator PWB or Decrementer PWB is to be removed, disconnect the cables and slide
the two logic boards out of their plastic mounting assemblies.
Replace the keyboard assembly as follows:
a.
Place the Emulator/Decrementor PWB's or Keyboard PWB, as applicable, into the plastic
keyboard mounting assembly.
b.
Reconnect the 25-conductor ribbon cable to the Keyboard PWB.
c.
Snap the four keyboard assembly keepers back in place (if removed).
d.
Replace the tach motor cable, paper drive motor cable, and ribbon drive motor cable back
into their holders on the right side of the case.
5-14
e.
Reconnect connectors PlOl, Pl06, PlO5, Pl04, P6 and P8 (if removed).
f.
Reconnect the ground strap to the front left comer of the Keyboard PWB.
g.
Replace the plenum as described in subsection 5.6.2.
h.
Replace the keyboard bezel and close the terminal cover.
i.
Replace the power cord and apply power to verify operation.
5.6.5 REMOVAL AND REPLACEMENT OF THE LOGIC PWB (MaiD Electronic PWB). Remove
the Logic PWB as follows:
a.
Unplug power cord.
b.
Remove the keyboard assembly as described in subsection 5.6.4 (steps a. through L).
c.
Lift the keyboard assembly from the terminal.
d.
Remove the two ac power connectors located in the lower left comer of the Logic PWB at E281
and E271 and disconnect the fan cable from J203.
e.
Disconnect I/O interface connector P3 and the ground leads from the aluminum ground shield.
f.
Lift the Logic PWB from the terminal.
NOTE
When replacing the Logic PWB, refer to Tables 5-2 for location of the
option PROM's and other components which must be transferred to the
replacement PWB assembly. Table 5-3 lists strappable options.
Replace the Logic PWB as follows:
a.
Place the Logic PWB in the bottom of the terminal case.
b.
Attach the ac power connectors at E281 and E27l and reconnect the I/O interface connector P3,
fan connector P203, and ground leads to the aluminum ground shield.
c.
Reinstall the keyboard assembly by inserting the keyboard keeper posts in the slots provided on
the Logic PWB.
d.
Complete replacement of the keyboard assembly as described in subsection 5.6.4.
5-15
5.6.6 REMOVAL AND REPLACEMENT OF LOGIC PWB BATIERY. Remove the Logic PWB
battery as follows:
a.
Unplug the power cord.
b.
Remove the keyboard assembly as described in subsection 5.6.4 (steps a. through L).
c.
Disconnect the battery cable at J9located in the upper right comer of the Logic PWB.
d.
Gently deflect the battery clip tabs and remove the battery from the logic PWB. (Early models
have the battery RTVed in place and replacement should be likewise).
Replace the Logic PWB battery as follows:
a.
Insert a new battery (TI part number 999880-00(1) and reconnect the connector at J9 Figure 5-3
illustrates the PWB battery details.
b.
Reinstall the keyboard assembly as described in subsection 5.6.4.
5.6. 7 REMOVAL AND REPLACEMENT OF PWB FUSE (250V, 3A).
a.
Remove the keyboard assembly as described in subsection 5.6.4 (steps a through i).
b.
Replace the fuse (TI part number 416434-0303, LCf the PWB at F250.
c.
Reinstall the keyboard assembly as described in subsection 5.6.4.
312003) located in the front left comer of
RED
J:
--
1
I
--
I
BLACK
Pin 3
Pin4
Figure 5-3. Logic PWB Battery Details
5-16
< 4+
3 KEY
< 2 N.C.
<1-
5.6.8 REMOVAL AND REPLACEMENT OF PAPER DRIVE MOTOR. Remove the paper drive motor
as follows:
a.
Unplug the power cord.
b.
Remove the terminal cover as described in subsection 5.6.1.
c.
Open the paper drive tractor flaps and remove any paper from the terminal.
d.
Remove the keyboard plenum as described in subsection 5.6.2.
e.
Lift both ribbon spools off their spindles and carefully remove the ribbon from the ribbon guides.
Wind the excess ribbon onto either spool and set the ribbon spools aside.
f.
Using a standard slot screwdriver, remove single screw holding the ribbon guide on the right side
of the printer subassembly as shown in Figure 5-1. Lay the guide aside. Remove all cable ties from
the paper drive motor cable-to-cable bundle (observe location of the cable ties for subsequent
replacement).
g.
Using a standard slot screwdriver, loosen the two screws that hold the paper drive motor to the
printer subassembly frame.
h.
Grasp the motor with your right hand while removing the screws and washers with your left; take
care to avoid dropping the parts into the terminal base. Set the screws and washers aside.
1.
Pull the motor out of the pinion hole and gently lift the motor cable from around the carriage motor
(located below the paper drive motor), the cable clip, and the cable holders of the keyboard
keepers.
j.
Set the motor on a bench or table top and remove connectors PI06 and PI04.
Replace the paper drive motor as follows:
a.
Insert the paper drive motor shaft into the hole provided in the printer mechanism frame and seat
the motor flange flush with the mechanism side plate. Apply silicone grease (TI Part Number
0232334-6050) between the rivet on the end of the gear and the motor flange.
b.
Push in on the motor and the plastic tractor drive and rotate the motor slightly back and forth until
the motor flange and the tractor drive fit flush against the frame.
c.
Align the mounting holes.
d.
Insert the top front screw through the gear bearing housing and frame until the screw engages the
motor flange. Start the screw with a screwdriver.
5-17
e.
Insert the rear bottom screw through the gear bearing housing and frame and align it in the motor
flange. Start the screw by hand.
f.
Tighten both screws.
g.
Route the cable around and under the rear of the carriage motor (located below the paper drive
motor) and along the right side of the carriage motor. Insert the cable into the cable restraint and
close the restraint.
h.
Place the cable into the two keyboard keepers on the right side. Replace the cable ties removed in
step f. of the removal procedure.
I.
Connect PI 04 and PI 06 to J104 and J106 on the Logic PWB. Ensure that the connectors are seated
all the way down or erratic terminal operation may result.
j.
Replace the right ribbon guide, ensuring that the paper drive motor cable is safely captured
between the guide and the side plate.
k.
Replace the ribbon; replace the keyboard plenum as instructed in subsection 5.6.2; and replace the
terminal cover as described in subsection 5.6.1.
5.6.9 REMOVAL AND REPLACEMENT OF THE TRACTOR ASSEMBLY. Remove the tractor
assembly as follows:
a.
Remove the terminal cover as described in subsection 5.6.1.
b.
Remove the inside E-ring from the round tractor support rod by applying pressure between the rod
and the ring with a screwdriver. Once the ring begins to detach, hold it with your free hand to
prevent it from flying off.
c.
Remove the outer snap ring by hand.
d.
Loosen the locking device on the tractors and slide the round rod to the left and out of the
mechanism.
e.
Use a standard slot screwdriver to remove the left bearing which supports the tractor square drive
shaft. Carefully avoid dropping washers and nuts into the terminal base and do not lose the hub and
spring located on that end of the bar.
f.
Remove the tractor assembly from the mechanism. (If the tractor drive gear remains on the end of
the bar, slide it off and set it aside).
g.
Slide the tractors off the bar; take care not to bend the bar.
5-18
Replace the tractor assembly as follows:
a.
Slide the tractors onto the square drive bar. Verify that the locking device for the left tractor is on
theleft and the locking drive for the right trctor is on the right and that the alignment mark on both
tractors' drive sprockets align with same corner of the square drive shaft.
b.
With the tractor doors facing you, place the drive gear (gear fitted tightly on the shaft) on the right
end of the shaft with the semicircle portion of the gear adjacent to each flat surface of the shaft.
c.
Insert the gear and shaft into the bearing on the right side plate.
d.
Replace the hub with spring on the left end of the drive shaft with the semicircles of the hub
adjacent to each drive shaft surface. Slip the bearing onto the hub and fasten the left side plate.
e.
Slide the round rod (non-grooved end first) from left to right through the left side plate, through the
tractors, and through the right side plate.
f.
Using needlenose pliers, replace the E-ring on the round rod, ensuring it is located inside the left
side plate.
g.
Replace the outer snap ring on the round rod outside the left side plate.
h.
Position the paper tractors as required and reload printing paper.
5.6.10 REMOVAL AND REPLACEMENT OF THE PRINTHEAD. Remove the printhead as follows:
a.
Disconnect the powr cord at the power receptacle located at the rear of the Model 820 KSR.
b.
Lift the terminal cover.
c.
Remove the keyboard plenum as described in subsection 5.6.2·.
d.
Remove and save the plastic cable retainer clip at the pointer where the printhead cable is folded
beneath the printhead.
e.
Using a small wrench or pliers, remove the two long hex nuts located behind the printhead
and facing the ribbon guides.
f.
Grasp the printhead and pull it towards the front of the terminal until the two mounting bolts clear
the mounting frame.
g.
Disconnect the printhead ribbon cable connector (120) from the connector at the bottom of the
printhead.
5-19
Replace the printhead as follows:
CAUTION
When handling the new printhead, take care not to damage the springs after
removing the foam shipping material. Grasp the printhead only by the
mounting plate or the plastic needle housing. 00 NOT handle the printhead
by the springs around the circumference of the printhead.
a.
Connect the printhead ribbon cable connector (J20) to the connector at the bottom of the printhead.
b.
Position the printhead so that the mounting screws align with the mounting holes in the support
frame and slide the printhead toward the platen as far as it will go.
c.
Start the two long nuts on the mounting screws and hand tighten.
d.
With a small wrenclJ or pliers tighten the long nuts 1/6 turn past hand tightened.
e.
Replace the plastic cable clip, starting the clip at the end with the notched comer.
f.
Replace the plenum as described in subsection 5.6.2 and reconnect the power cord to the rear of
the terminal.
g.
If the printhead smudges the paper during printing and the .problem cannot be corrected with the
form thickness adjustment, it may be necessary to adjust the ribbon guide at the nose of the
printhead as described in subsection 5.6.11.
h.
Close the terminal cover.
5.6.11 PRINTHEAD RIBBON GUIDE ADJUSTMENT.
a.
Lift the terminal cover and rotate the printhead adjustment lever all the way towards the keyboard.
b.
Remove the ribbon as described in step 5.6.8.e above.
c.
Loosen the two screws on either side of the nose of the printhead and slide the ribbon guide away
from the platen, exposing the printhead nose through the ribbon guide window.
d.
Place a shim (file card or equivalent) between the platen and the printhead nose.
e.
Using the adjustments lever, push the printhead nose against the shim until it is held firmly against
the platen.
f.
Slide the ribbon guide toward the platen holding it flush against the shim and tighten the screws.
Using the adjust lever remove the shim.
5-20
g.
Replace the printing ribbon and set the printhead adjust lever for pro~r printing.
5.6.12 REMOVAL AND REPLACEMENT OF mE RIBBON DRIVE SUBASSEMBLY. Remove the
ribbon drive subassembly as follows:
a.
Unplug the power cord.
b.
Remove the terminal cover as described in subsection 5.6.1.
c.
Remove the printing ribbon spools from the ribbon spindles and guides and set aside.
d.
Remove the three screws that attach the ribbon drive subassembly to the printer mechanism frame.
e.
Tilt the subassembly backward to rest in the rear cavity of the terminal base.
f.
Remove the two spade lugs from the ribbon reverse switch, noting their orientation for reconnection to the replacement unit.
g.
Cut the cable tie that secures the motor cable to the rear bar of the printer mechanism frame and the
cable ties attaching it tothe rest of cable, noting position of cable ties.
h.
Disconnect cable connector PlOl from the Logic PWB (the main PWB) and carefully lift the cable
out of the keyboard keepers, the cable restraint and from around the carriage motor.
Replace the ribbon drive subassembly as follows:
a.
Lay the replacement assembly in the rear cavity of the terminal base.
b.
Attach the two spade lugs to the ribbon reverse microswitch of the ribbon drive subassembly.
Verify that the the connections are oriented the same as the unit that was removed or the ribbon
will not reverse automatically.
c.
Attach a cable tie to hold the motor cable to the rear frame bar of the print mechanism.
d.
Hold the ribbon drive subassembly in place and install the three screws that secure the subassembly
to the rear of the print mechanism framework.
e.
Route the ribbon drive motor cable around and under the carriage motor and through the cable
restraint. Using cable ties replace those removed in step g of the removal instructions.
f.
Connect PlOl at J101 on the Logic PWB, ensuring that the connector is snugly joined.
g.
Place the cables in the keyboard keeper cable retainer.
5-21
h.
Replace the printing ribbon. It may be necessary to readjust the subassembly (by loosening the
three mounting screws and moving the assembly to front or rear and retightening the screws) so
that the ribbon passes through the center of the slots in the shift arm.
1.
Replace the terminal cover as instructed in subsection 5.6.1.
5.6.13 REMOVAL OF THE CARRIAGE MOTOR AND MECHANISM (Or Wire Rope Or
Mechanism).
a.
Unplug the power cord.
b.
Remove the terminal cover and plenums as described in subsections 5.6. I, 5.6.2 and 5.6.3,
respectively.
c.
Disconnect the ground strap on the left side of the mechanism that is attached to the PWB
ground plane. .
d.
Disconnect the ground lug at the rear of the terminal to the left of the EIA connector.
e.
Disconnect all the connectors at the rear of the Logic PWB, (including the printhead ribbon
cable) and lift the cables out of the cable restraint and keyboard keepers. Remove all cable
ties, noting their positions.
f.
Push the idler pulley support to the right until the slot on the bottom of the support catches on the
right sideplate of the print mechanism frame.
g.
Insert a slotted screwdriver at an angle next to the upper printbead carriage rod to remove the front
two mounting screws.
h.
Remove the two rear mounting screws.
i.
Lift the entire printer mechanism subassembly up and out of the terminal. 00 NOT LIFf
THE MECHANISM BY THE SQUARE TRACTOR DRIVE SHAFT.
j. .
Remove the wire rope from the capstan by disengaging the end of the wire rope from either end of
the capstan and unwrapping the wire.
k.
Remove the ground strap screw from the front of the motor and remove the ground strap.
1.
Loosen the motor strap retaining screw inside the bottom of the right sideplate.
m.
Press down on the top of the motor strap to disengage the strap from the sideplate.
n.
Remove the carriage motor.
5-22
o.
Remove the plastic cradle from the carriage motor by removing the screw that holds the cradle to
the motor.
p.
Remove the two wires from the motor terminal, noting their orientation for connecting the
replacement unit.
Replace the carriage motor and mechanism as follows:
a.
Connect the motor drive cable spade lugs to the carriage motor terminals as they were connected to
the old motor.
b.
Attach the plastic cradle to the motor.
c.
Position the motor against the sideplate.
d.
Hook the motor strap onto the tab in the sideplate and tighten the retaining screw.
e.
Replace the ground strap onto the front of the motor with the screw that previously held it.
f.
Turn the wire rope capstan so that the rear wire rope is at the top.
g.
Insert the ball of the top wire rope end into the slot. The tip of a screwdriver may be required to
press the ball for a snug fit.
h.
Holding the wire rope between your left thumb and forefinger, turn the capstan clockwise 6 1/2
turns.
1.
Guide the wire rope into the capstan grooves. When complete, the outer capstan slot should be
pointing up.
J.
Wrap the lower end of the wire rope counterclockwise around the capstan starting with the groove
adjacent to the last one filled by the upper rope end.
k.
Insert the ball into the capstan slot.
1.
Loop the printhead cable and the motor cables over the tractor drive bar to keep them out of the
way during installation of the printer mechanism subassembly.
m.
Replace the printer mechanism into the terminal base so that mounting screw holes are aligned
with the mounting holes in the base. DO NOT LIFT THE MECHANISM BY THE SQUARE
TRACTOR DRIVE SHAFT.
n.
Insert the mounting screws and partially tighten them.
5-23
o.
Gently return the idler pully support to the operating position by lifting the right end while holding
the support to the right with your free hand, preventing the pulley from snapping back.
p.
Route and connect all the cables, including the ground lugs to the left of the EIA connector and the
ground strap on the left side. Replace all cable ties removed in step e. of the removal procedure.
q.
Replace the plenums and terminal cover as described in subsections 5.6.3, 5.6.2 and 5.6.1,
respectively.
5-24
SECTION VI
ASSEMBLY DRAWINGS AND LISTS OF MATERIALS
TI Drawing Number
NA
993205
993210
993211
994238 999686
999687
999689
999690
999691
999694
99%95
999712
999730
999732
999735
999736
999738
999742
999779
999780
999787
999790
999791
999819
999820
999835
999837
999872
999873
999876
999913
999918
999925
Title
Figure 6-1. Model 820 KSR Illustrated Major Assemblies
Cable Assembly , 202/212
Cable Assembly, Data Terminal
Cable Assembly, EIA Extension
Carriage Drive Assembly
820 KSR Terminal, 10/16 CPI
Ribbon Drive Assembly
Mechanism
820 Terminal, Basic
Keyboard Assembly, Full ASCII
Terminal Electronics PWB
820 KSR Terminal, 10 CPI
Keyboard Assembly, Standard ASCII
Motor Assembly, Paper Drive
Printhead Assembly, 30 volt
Cable Assembly, Ribbon Reverse/Paper-Out
Cable Assembly, Carriage Drive
Motor Assembly, Ribbon Drive
Cable Assembly, EIA (internal)
Decrementer PWB
Gear Assembly, Paper Advance
9940 Emulator PWB's
Cable Assembly, Keyboard
Cable Assembly, Printhead
-Fan Assembly
Terminal Electronics PWB with Ground Plane
Cable Assembly, Power Distribution
Cable Assembly, 9940 Emulator
Ground Plane Assembly
Cable Assembly, Mechanism Ground
Cable Assembly, Primary Power
Carriage Assembly, Printhead
Terminal Cover Assembly
Test Plug
6-1
Page No.
6-1
6-3
6-5
6-7
6-9
6-14
6-18
6-21
6-31
6-42
6-46
6-74
6-78
6-85
6-87
6-91
6-92
6-94
6-96
6-98
6-99
6-101
6-104
6-106
6-108
6-109
6-112
6-114
6-115
6-117
6-119
6-121
6-123
6-126
15
12
13
16
10
11
4
I
.~
~8
1.
2.
3.
4.
5.
6.
7.
8.
Terminal Cover
Terminal Base
Keyboard Bezel
Plenum, PWB
Keyboard PWB
Card Frame, Keyboard/Option
Emulator/Dec rementer Kit
Terminal Electronics
9.
10.
11.
12.
13.
14.
15.
16.
Kit, Battery, Package
Fan Plenum
Fan Assembly
Printer Mechanism Assembly
Paper Advance Bearing
Tractor, Paper, Precision
Motor Assembly, Paper Drive
Ribbon Guide
6
17.
18.
19.
20.
21.
22.
23.
24.
Nose Guide, Printhead
Ribbon Drive
Ribbon Spools
Strap, Motor
Carriage Drive Motor Assembly
Cradle, Motor
Carriage Assembi\" Printhead
Printhead Assembly, 30V
Figure 6-1. Model 820 KSR mustrated Major Assembles.
6-2
I
8
I
7
I
6
!
5
WIRE
[[] tA.BLE CLAMPSCRc.WS 'RETA'KE'RCUPS(.
SCREWS INCLUDED WITH ITEM Z
.J
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SECTION VII
DIAGRAMS
This section contains the logic diagrams for the Model 820 KSR major assemblies.
TI Drawing Number
999692
999710
999777
999785
999883
Page No.
Title
Terminal Electronics
ASCII Keyboard
Decrementer
9940 Emulator
Interconnection, 820 KSR
7-1
7-2
7-16
7-19
7-21
7-23
8
LOGIC REfERENCE DESIGNATOR
FIRST USED
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1. RESISTRNCE VALUES RRE IN OHMS
2. RESISTORS RRE ,.25 101, 5 peT
3.
5
6
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NOTFS UNUtSS OlHf RWIS[ SPf.Uf lEU
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CAPRCITORS ARE • +80-20 PCT
4. DIODES ARE IN,i002
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TABLE ON SHEET 11
E23
R7 - A9
R20
R23
U7
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C33
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4
DRIVER REFERENCE DESIGNATORS
FIRST USED
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D
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Fipft B-1. Model 820 KSR Control Character Keyboard Layout
B-1
Table B-2. UKASCD Code Chart
COLUMN 0
ROWO NUL
SOH
1
2 STX
ETX
3
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4
5
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ENG
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6
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Tables B-2 thru B-6list and define optional character set codes.
B-2
m
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Table B-3. German ASCll Code Chart
COLUMN
ROWO
1
2
3
4
5
6
7
8
9
A
B
C
0
1
NUL
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ACK
BEL
BS
HT
LF
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B-3
Table B-4. Swedish/Finnish ASCII Code Chart
COLUMN
ROW 0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0
1
2
3
4
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ACK
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BS
HT
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VT
FF
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SO
SI
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B-4
Table B~5. Danish/Norwegian Code Ch~
COLUMN 0
ROW 0 NUL
1 SOH
2 STX
3 ETX
4 EOT
ENO
5
ACK
6
BEL
7
8 BS
HT
9
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A
VT
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D CR
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1
so
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Table 8-6. Standard Katakana Code Chart
CONTROL
FOR BOTH
KANA & ASCII
~-..-A-~
COLUMN 0
ROW 0 NUL
1 SOH
2 STX
3 ETX
4 EOT
5 ENQ
6 ACK
7 BEL
8 BS
9 HT
A LF
B VT
C FF
0 CR
E SO
F SI
U.S. ASCII MODE
2
OLE SP
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DC2 "
DC3 #
DC4 $
NAK %
SYN &
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CAN (
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3
4
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6
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2
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,DEL
APPENDIXC
MODEL 820 KSR TERMINAL OPTIONS AND ACCESSORIES
Tables Cl and C2 list available options, accessories, and their part numbers and their configuration
abbreviations.
TABLE C-l. MODEL 820 KSR TERMINAL OPTIONS
Configuration
Description
TI Part Number
Abbreviation
KEYBOARD ASSEMBLY OPTIONS (One Only)
Keyboard Assembly, Full ASCII
Keyboard Assembly, Full ASCII, with Numeric Pad
Keyboard Assembly, APL
Keyboard Assembly, APL, with Numeric Pad
Keyboard Kit, Katakana
Keyboard Kit, Katakana, with Numeric Pad
Configuration PROM Option Kit, Configuration PROM
Printer Control Option Kit,
Device/Forms Control Kit,
Device/Forms Control (Katakana)
0999691-0101
0999691-0102
0999691-0201
0999691-0202
0999859-000 1
0999859-0002
0999761-0001
KFS
KFN
KAS
KAN
KKS
KKN
MDP/MPP
0999845-0001
0999906-000 I
MFG
MFG
Character Set Suboptions (One Only)
Kit, Character Set, United Kingdom, ASCII
Kit, Character Set, Denmark/Norway, Full ASCII
Kit, Character Set, Sweden/Finland, Full ASCII
Kit, Character Set, France, ASCII
Kit, Character Set, Germany, Full ASCII
0999849-0001
0999850-0001
0999851-000 I
0999852-0001
0999866-000 I
UKF
DNF
SFF
FRF
GRF
Stand Options
Stand, w/o Top
Basket Kit, Paper-Stand
0999841-0001
0999839-0001
Keyboard Assembly Options (Field-Installed Only)
Kit, Keyboard Assembly, Full ASCII
Kit, Keyboard Assembly, Full ASCII, with Numeric Pad
Keyboard Kit, Katakana
Keyboard Kit, Katakana, with Numeric Pad
0999691-810 I
0999691-8102
0999859-800 1
0999859-8002
KFS
KFN
KKS
KKN
0999761-8001
MDP/MPP
0999845-8001
0999906-800 I
MFG
MFG
Configuration PROM Option (Field-Installed Only)
Kit, c:onfiguration PROM
Kit, Printer Control Option
Kit, Device/Forms Control
Kit, Device/Forms Control, Katakana
Priater ClMftpresseci Print Option (Field-Installed Only)
Kit, Compressed Print
0999867-0001
Charader Set Subeptions (Field-Installed Only)
Kit, Character Set, United Kingdom, Full ASCII
Kit, Character Set, Denmark/Norway, Full ASCII
Kit, Character Set, Sweden/Finland, Full ASCII
Kit, Character Set, France, Full ASCII
Kit, Character Set, Germany, Full ASCII
Emulatoc Kit
0999849-800 I
0999850-8001
0999851-8001
0999852-8001
0999866-8001
0999903-800 I
C-l
UKF
DNF
SFF
FRF
GItF
TABLE C-2. MODEL 820 KSR TERMINAL ACCESSORIES
Part Number
Base Description
Basket, Kit, Paper
Ribbon, Black Nylon Matrix 60 yd.
Ribbon, Black Nylon Matrix 60 yd.
Ribbon, Black Nylon Matrix 40 yd.
Ribbon, Black Nylon Matrix 40 yd.
Manual, Maintenance
Manual, Operator's
Kit, Acoustic Enhancement
Window, Tenninal
0999838-0001
0996704-0001
0996704-0002
0996241-0001
0996241-0002
0999853-9701
0999854-970 I
0999886-000 1
0999713-0001
(single)
(6 pack)
(single)
(6 pack)
Aceessory Cables
0993211·0001
0993210-0001
2262093-0001
0999891-0001
0996289-0001
0996290-0001
0996348-0001
0993205-0001
0996688-0001
Cable Assembly, EIA Extension
Cable Assembly, Data Terminal
Cable Assembly, 990 Computer
Cable Assembly, Auxiliary ElA Device
Cord Set, Power, Domestic
Cord Set, Power, Western Europe
Cord Set, Power, w/o Connector
Cable Assembly, 202/212
Cable Assembly, Power, Electrical (AustraIian)
C-2
APPENDIXD
OMNI 800 MODEL 820 PRINTER
RIBBON AND PAPER RECOMMENDATIONS
RIBBON
The Omni 800* Model 820 Printer is furnished with a black nylon matrix, impact printer ribbon wound on
dual spools. Replacement ribbons may be purchased from Texas Instruments in packs of six under part
number 09%704-0002.
To prolong the life of your printhead, u~ only the above print ribbon or an equivalent available from
Addressograph Multigraph Corporation under part number 116-2800-163.
PAPER
The Model 820 Printer will accept standard, dual-sprocket-punched, continuous, business form paper in any
width from 3 to 15 inches (76.2 to 38.1 mm).
Multiple-part business forms, one original and up to five copies, can be printed on paper with the following
weight specifications:
Single Part Forms
Multiple Part Forms
Carbon Paper
-15 to 20 pounds
-Original: 12 to 15 pounds
Copies: 9 to 12 pounds
LastCopy: 15pounds
- 7.5 pounds with medium hardness.
NOTE
Total form thickness should not exceed 0.021 inch (0.53 mm).
*Trademark of Texas Instruments Incorporated
D-I
APPENDIXE
INSTALLATION OF OPTIONAL KITS
This appendix contains installation instructions for the following accessory and option kits:
Tenninal Stand Kit (999841-0001)
Acoustic Enhancement Kit (999886-0001)
Terminal Paper Basket (999938-0001)
£-1
TI Publication 99910-9701
Issued 1 August 1978
INSTALLATION INSTRUCTIONS
Omni 800 TERMINAL STAND KIT
Kit Part Number 0999841-000 1
1.
GENERAL
The Omni BOO* Terminal Stand kit consists of a specially
designed table and all necessary hardware for attachment of a
Texas Instruments Model 810 or Model 820 to the stand.
2.
I.
2.2
INSTALLATION INSTRUCTIONS
The following instructions explain how to attach an Omni
800 printer. The procedure varies from the Model 810 to the
Model 820, so choose the appropriate instruction for your
model.
2.1
MODEL 810 PRINTER INSTALLATION
a.
Disconnect the ac power cable and the communications cable (if installed).
b.
Install levelling screws in each corner of the legs
as shown in Figure 1.
c.
Install the modesty panel with four 6-32 screws
and lockwashers as shown, and be sure the lockwashers are next to the screw heads.
d.
Install the spacer panel and ring lug end of the
ground cable with four 6-32 screws and lockwashers as shown. Be sure the lockwashers are
next to the screw heads and the ground cable is at
the rear of the left leg.
e.
Mount the Model 810 printer on the stand with
four 10-12 self-tapping screws as shown in the
figure.
f.
Remove the right rear screw and lockwasher
from the printer rear paper chute.
g.
Attach the ground cable lug to the printer with
the screw and lockwasher removed in step f. Be
sure the lockwasher is installed between the
paper chute and the ground cable lug.
h.
Place the printer and stand in the desired operating location and adjust the leg levelers as
required to level the printer.
Reconnect the ac power cable and communications cable as required.
MODEL 820 PRINTER INSTALLATION
a.
Disconnect the ac power cable and the communications cable (if installed).
b.
Install levelling screws in each corner of the legs
as shown in Figure 2.
c.
Install the modesty panel with four 6-32 screws
and lockwashers as shown, and be sure the lockwashers are next to the screwheads.
d.
Install the spacer panel with four 6-32 screws
and lockwashers as shown, and be sure the lockwashers are next to the screwheads.
e.
Mount the Model 820 printer on the stand with
four 10-32 UNC X 1% panhead screws and No.
10 external tooth washers.
Do not substitute longer screws; damage to
the machine may result.
*Trademark of Texas Instruments Incorporated
E-2
f.
Place the printer and stand in the desired operating location and adjust the leg levelers as
required to level the printer.
g.
Reconnect the ac power cable and communications cable as required.
1____
10
2
o
7
CAUTION
USE WITH MODEL
810 TERMINAL ONLY
1.
2.
3.
4.
5.
Spacer panel
6-32 x % self tapping SCTew and
external tooth washer (8 places)
10-12 self tapping x 1 Ig screw (4 places)
Right leg
Leveler {4 places}
to.
Left leg
Modesty panel
Ex isting I>rinter screw"
Ground cable
External tooth- washer
.
Not supplied in Kit
6.
7.
8.
9.
Figure 1. Model 810 Terminal Stand Kit
E-3
2
7
I
l
CAUTION
1.
2.
3.
4.
5.
6.
7.
8.
Spacer panel
6-32 x Yo self tapping screw and
external tooth washer (8 places)
10-32 UNC x 1% panhead screw (4 places)
Right leg
Leveler (4 places)
Left leg
Modesty panel
No. 10 external tooth washer· (4 places)
Figure 2. Model 820 Terminal Stand Kit
E-4
TI Publication 999900-9701
Issued 25 September 1978
INSTALLATION INSTRUCTIONS MODEL 820 KSR
ACOUSTIC ENHANCEMENT KIT INSTALLATION
Kit Part Number:999886-0001
INSTALLATION INSTRUCTIONS
The following instructions explain how to attach the Model
820 KSR Acoustic Enhancement Kit to the Model 820 KSR
Terminal.
999721-0001 PAD INSULATOR
COVER
TOP
999707
1.
Remove release paper from pad.
2.
Making sure slot in pad is lined up with opening
in base-stick pad to base.
SCREW
972679·0013
WASHER SMALL
411027-0806
999899-0001 COVER ASSEMBLY AIR EXHAUST
(2 PLACES)
Locating the cover hooks into the ftrst and last air
exhaust slots, snap cover into place.
999898-0001 DAMPER ASSEMBLY
1.
2.
SCREW
972679-0013
'NASHE R LARGE
Open cover and remove stay external 999749
from stay plate 999751.
99915-0001
(2 PLACES)
Remove cover, false 999762 (2).
STAY
PLATE
999751
3.
Placing Damper Assembly 999898 on cover top
999707 mount assembly using the following
hardware:
+
+
STAY EXTERNA
999749
972679-0013 (4) screw
411027-0806 (2) washer small
999915-0001 (2) washer large
Using the large washer over the square hole
tighten all 4 screws compressing the rubber seal,
leaving a .03/.06 gap between Damper Assembly and cover.
~
TEXAS INCORPORATED
INSTRUMENTS
.
DIGITAL SYSTEMS DIVISION
P.O. BOX 1444 HOUSTON. TEXAS 77001
E-S
TI Publication 0999937-9701
Issued 1 September 1978
INSTALLATION INSTRUCTIONS
Omni 800* MODEL 820 KSR DATA TERMINAL
TERMINAL PAPER BASKET
Part No. 0999838-0001
1.
GENERAL
The Tenninal Basket Kit consists of the basket and all necessary hardware to attach the paper basket to the Model 820
KSR tenninal.
2.
INSTALLATION
1.
Lift the cover of Model 820 KSR and disconnect the cover stay (located in right rear of printer) by moving
top of stay to right and off of pivot pin attached to cover (see Figure 1). DO NOT let cover open more than
90° to base.
2.
Attach ground cable (location: inside right rear of printer) by faston connection on one end and using
lockwasher and nut on other end as shown (see Figure 2).
3.
Attach stay (which was disconnected in Step 1) to cover and close printer.
4.
Insert basket hooks into slotted boles in rear of printer and rotate down into rest position (see Figure 3).
LOCKWASHEA
I
Figure 2
Figure 1
Figure 3
*Trademark of Texas Instruments Incorporated
E-6
APPENDIXF
GLOSSARY OF MODEL 820 KSR LOGIC SIGNALS
AO through A12
A13
IAccl
IAcc2
IAUXOPINT
IAUXOPINTAK
IBAS, BAS, BA8, BA9 through BAl2
BCRUCLK
BCRUOUT
IBDIRECf
BOO through BD3
BELL
IBMEMEN
IBP3
IBSENSOR
IBWE
ICE I
CE2
CELIF
CEOPf
CGAO through CGA11
CMFWD
ICMRAMSEL
CMTRA
CMTRB
COCHR
CRUIN
ICRUTC
DO through 07
DBIN
DIRECf
DFWT
DRIVENA
DTACH
DX
9980 address bus
9980 address line/CRUOUT
Acceleration I
Acceleration 2
auxiliary option interrupt
auxiliary option interrupt acknowledge
buffered address line (9980)
buf~ered communication register unit clock (9980)
buffered communication register unit output (9980)
buffer carriage motor direction indicator
buffered data lines. (9980)
bell enable
buffered memory enable
buffered phase 3 clock (9980)
buffered sensor
buffered write enable
chip enable 1 (9902 enable)
chip enable 2
chip enable line interface
chip enable option
character generator address bus
carriage motor forward direction
CMOS RAM select
Carriage Motor Termination A
Carriage Motor Termination B
compressed character
communication register unit input
9940 MPSI clock
9980 data bus
data bus in
carriage motor direction indicator
driver enable
DY
FI-F8
FWD
HLD2
HOL2A
character generator data lines
Carriage motor forward
9940 hold
9940 hold acknowledge
F-l
HOLD
ICO through IC2
INTI
INT2
/INTIAK
INT2AK
/IOSEL
KBDO through KBD7
KBDENA
/KBDIN
/KBLDCLK I
KBLDCLK2
/KBSHCLK
LIFCfL
/MPSI
MSINTI
/MSINTAK
MSINTQ
/P3
/PAPOUT
PAPOUTSW
PDMCC
PDRV
POA through POD
PPHSA
PPHSB
PPHSC
PPHSD
/PROMISEL
/PROM2SEL
PWRGOOD
RO-RII
/RAMSEL
RDRV
READY
REV
ROA through ROD
RDLCK
/ROMISEL
/ROM2SEL
IROM3SEL
RPHSA
RPHSB
RPHSC
RPHSD
9980 hold
9980 iJ;lterrupt c~es
. interrupt 1 (9940)
interrupt 2 (9940)
interrupt acknowledg~(9940)
interrupt 2 acknowledge (9940)
I/O select
keyboard data bus
keyboard enable
keyboard input enable
keyboard load clock 1
keyboard load clock 2
keyboard shift clock
line interface control
9980 CRU I/O select line (multi-processor system interface)
master/slave interrupt I
master/slave interrupt acknowledge
printer controller to terminal
9980 phase 3 clock
paper out
paper-out switch
paper drive motor current control
paper drive
phase A, B, C, D (paper drive)
paper motor phase A
paper motor phase B
paper motor phase C
paper motor phase D
programmable ROM I select
programmable ROM 2 select
power good
keyboard row select lines
RAM select
ribbon drive
9980 ready
carriage motor reverse
Ribbon motor phase A through D
ribbon drive latch clock
ROM chip I enable
ROM chip 2 enable
ROM chip 3 enable
ribbon motor phase A
ribbon motor phase B
ribbon motor phase C
ribbon motor phase D
F-2
SENSOR
/RIBREV
RIBREVSW
SF I through SF8
/SLERRCD
/SLINT2
/SLIO
/STLCFG
/STPWRGOOD
/SYSTSTINT
/TCARDET
TC
{TCTS
TD
/TDSR
/TDTR
/TRI
TRTS
TSCRD
TSCXD
TXMTDAT
TRCVDAT
TOAI,TOBI,T0A2,TOB2
5 MHz
10 MHz
/9902INT
/994OCLK
+5VDVR
+5VSW
+33VHD
+33MTR
+33VMTRFZD
sensor
ribbon reverse
ribbon reverse switch
solenoid drive signals (printhead drive)
slave error code
master to slave interrupt (see MSINTI)
select I/O (CRU)
system test line configure
system test power good
system test interrupt
terminal carrier detect
terminal clear to send
terminal data set ready
terminal data terminal ready
terminal ring indicator
terminal request to send
terminal secondary channel receive data
terminal secondary channel transmit data
terminal transmit data
terminal receive data
tach phase A/B normal/compressed
5 MHz (9940 clock)
10 MHz (9980 clock)
9902 interrupt
9940 clock
+5 volt drivers
+5 volt switched
+ 33 volt printhead
+33 volt motor
+33 volt motor fuzed
F-3
INDEX
Title
Page
Title
Page
A.
Accessories ............... . . . . . . . . . .. 1-3
Acoustic Coupler Transmit
Level Adjustments ..................... 5-5
Alternate Character Set - ASCII/APL ..... 3-21
Assemblies Removal and Replacement . . .. 5-7
Asynchronous Communication
Controller .......................... 4-12
Audible Tone ......................... 3-8
Audible Tone Operation .......... ,..... 3-8
Audible Tone Test ..................... 5-3
Automatic New Line .................. 3-10
(TI Part No. 993205-0(1) ..............
Device Control Commands .............
Device/Forms Control (DFC) ...........
Disable ON/OFF Parameters ...........
2-19
3-19
3-18
2-16
E.
EIAPlug ..... , ...................... 54
End-of-Line Alarm ................... 3-10
Enable Mutually Exclusive Parameters .... 2-16
Enable ON/OFF Parameters ............ 2-16
F.
B.
Failure Analysis Chart .................. 5-8
Features and Specifications .............. 1-1
Format Parameters ., . . . . . . . . . . . . . . . . .. 3-8
Forms Control Commands ............. 3-20
Full-Duplex Operation . . . . . . . . . . . . . . .. 3-15
Barberpole Test ....................... 54
Blocking Oscillator Circuit ..... ~ . . . . . . .. 4-5
C.
CarriageJ~Detection ................ 4-19
Character Printing .... ;...... . . .. . . . .. 4-19
Character Set and Font .. . . . . . . . . . . . . . .. 3-8
Code Generating Keys .................. 3-6
Communications Interface ... . . . . . . . . .. 3-12
Communications Interface ....... . . . . .. 4-12
Communications Interface
Cable Connection . . . . . . . . . . . . . . . . . . .. 2-18
Communications Mode (11-15) ....... . .. 2-8
Communications Rate ................. 2-10
Communications Test .................. 54
Compressed Print . . . . . . . . .. . . . . . . . . .. 3-19
Configuration Codes ................... 2-9
Configuration Errors .................. 2-17
Configuration Parameter Entry .......... 2-15
Configuration Parameter Selection ........ 2-8
Configuration Report .................. 2~ 15
Configuration Report .. ;................ 5-6
Con~guration Set Selection (01-09) ....... 2-8
CONFIGURE/OPERATE Switch ..... ... 3-7
Console Operation .................... 3-18
Control Characters .................... 3-10
Control Panel ......................... 3-1
G.
General Description .................... 1-1
H.
Half-Duplex with Reverse Channel
Operation ........................... 3-17
Half-Duplex (Without Reverse Channel)
Operation ........................... 3-16
HERE IS Key ... . . . . . . . . . . .. . . . . . .... 3-7
I.
Identification ......... ~ ............... 1-3
IndicatorTest ......................... 5-3
Initiate Configuration ................. 2-15
Input Voltage Selection
and Rectification ...................... 4-3
Installation ........................... 2-1
Interface Signal Levels ................ 3-14
. Interface Signals .................... 3-12
Interface Signals ..................... 3-13
Interface Signals ....... . . . . . . . . . . . . .. 4-12
Interpreting Terminals Status
DiSplay (TSD) Functions ................ 3-5
D.
Data Buffering and Printer Throughput
Data Set Cable
K.
. .. 3-11
Keyboard Interface
I-I
................... 4-10
INDEX (Continued)
Title
Title
Page
Keyboard Matrix
Keyboard/Switch Scan
0
0
0
0
0
•
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
4-9
4-9
Paper-Out Detection
Parity (31-38)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2-11
3-1
3-15
3-3
3-4
3-14
0
0000000000000000000
0000000000000000000000000
0
0
0
0
0
0
0
0
0000000000000000000000.00
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
5-1
5-3
3-11
4-8
0
000000000000000000000
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
4-18
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
•
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
o.
0
0
0
0
0
0
0
0
0
0
0
.00000
•
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
4-7
5-3
3-22
3-7
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
•
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
•
0
0
0
0
0
0
0
0
0
0
0
0
0
••
0
0
0
0
0
0
0
•
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2-17
2-14
00000000000000
0
00
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
4-17
2-10
2-2
4-6
2-6
2-5
4-2
5-3
5-1
5-1
3-10
3-8
4-15
3-10
4-17
4-17
5-20
0000000000000.000000000000
No
0
0
0
0
Nonvolatile Memory o.
Nonvolatile Memory Test
Numeric Keypad
Numeric Keypad Option
0
0
Mo
Maintenance
Maintenance Tests
Mechanism Failure Detection
Memory Control Logic
Motor Driver Acceleration
Control Output
0
Power Cord Connection
Power-Good Circuit .
Power-Off Procedure
Power-On Procedure
Power Supply
Power-Up Diagnostic Tests
Preventive Maintenance
Preventive Maintenance Schedule
o.
Printable Characters
Printer
Printer Controller Subsystem
Printer Operation
Printhead Carriage Drive
Subsystem
Printhead Positioning
Printhead Ribbon Guide Adjustment
Program theABM, LTA, and
ENTER Key
Programmable Parameters
(ABM, LTA, ENTER) o.
Programmable Read Only
Memory (Optional)
L.
Line Control (61-64)
LINE/-/LCL Switch
LINE Mode
LINE RDY and CARR RCV Indicators
LINE RDY and CARR RCV Indicators
LocalMode
Page
0
4-8
Ro
Oil Top Guide Rod and Clean Ribbon Guides
and Lower Guide Rod
Operation
Operational Checkout and
Printhead Adjustment
Operator Interface
~
Operator's Panel
Operator's Reference Cards
Option PROM/ROM Part Numbers
and Locations
Options .
Options
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0000000000000000000000000000
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
•
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
o.
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
•
0
5-2
3-1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0000000000000000000000000000
0
0
0
0
0
•
0
0
0
0
2-6
4-8
3-1
3-23
0
5-11
1-1
3-18
00
0
0
0
0
00
0
0
0
0
0
0
0
0
0
0
0
0
0000000000000000
000000000000000
Po
Paper Drive Subsystem
Paper Loading
Paper Motor Drive Circuit
Paper-Out Condition
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
000000000;
0
0
0
0
;
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
000000000000000
0
000000000000
0
RAM Test
Random Access Memory
Read Only Memory
Reference Sensing Cfrcuit
Removal and Replacement
of the Fan Assembly
Removal and Replacement
of the Keyboard Assembly (Keyboard PWB
or Emulator Decrementor PWB's) o. o.
Removal and Replacement of the Logic PWB
(Main Electronic PWB)
Removal and Replacement
of the Keyboard Plenum
Removal and Replacement of Logic
PWB Battery
Removal and Replacement of Paper
Drive Motor
0
0
4-16
2-3
4-16
3-11
000000000000000000000000
0000000000000000000000000
1-2
5-3
4-8
4-7
4-5
5-13
5-14
5-15
5-12
5-16
5-17
INDEX (Concluded)
Title
Page
Title
Removal and Replacement of PWB Fuse
(250V,3A) ......................... 5-16
Removal and Replacement
of the Printhead ...................... 5-19
Removal and Replacement of the
Ribbon Drive Subassembly ............. 5-21
Removal and Replacement
of Tenninal Cover ..................... 5-7
Removal and Replacement
of the Tractor Assembly ............... 5-18
Removal of the Carriage Motor and Mechanism
(Or Wire Rope Or Mechanism) .......... 5-22
Review Current Configuration .......... 2-15
Ribbon Drive Subsystem ............... 4-12
Ribbon Installation ......... . . . . . . . . . .. 2-4
Ribbon Motor Direction ............. .. 4-13
Ribbon Motor Drive ................ .. 4-12
ROM Identification Report .............. 5-6
ROM Test ........................... 5-3
~age
Standby Mode ....................... 3-14
Status Codes ............... . . . . . . . . .. 3-4
Strappable Option on Logic PWB
(999694-0001) ....................... 5-11
System Clock and Interrupt Logic ......... 4-8
T.
Terminal Control (81-89) .............. 2-13
Terminal Controller Memory ............ 4-7
Tenninal Controller/Printer
Controller Interface ................... 4-13
Terminal Controller Subsystem ....... :... 4-6
. Terminal Status Display
and Indicators ............. . . . . . . . . .. 4-10
Tenninal Status Display (TSD) ........... 3-3
Tenninate Configuration ............... 2-17
Theory of Operation .. . . . . . . . . . . . . . . . .. 4-1
TMS 9980 Microprocessor .............. 4-7
Transmission Control (71-72) ........... 2-12
Troubleshooting . . . . . . . . . . . . . . . . . . . . .. 5-7
Typewriter Keyboard .. . . . . . . . . . . . . . . .. 3-6
S.
Secondary Filtering and Regulation
Circuits ... . . . . . . . . . . . . . . . . . . . . . . . . .. 4-5
Self-Tests ............................. 5-3
Setting the Top-of-Form ............... 3-11
Signal-Level Conversion ............... 4-12
Soft-Start Circuit ...................... 4-4
Specifications ........................ 1-2
Space Requirements ..... '. . . . . . . . . . . . .. 2-1
Special Function Keys .................. 3-6
U.
User-Defined Configuration Sets
........ 3-20
V.
Vacuum the Printhead Area . . . . . . . . . . . .. 5-1
VIEWIOFF Switch
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USER'S RESPONSE SHEET
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Manual Title:
Model 820 KSR Terminal Maintenance Manual
Manual Date: 7 December 1978
Date of This Letter: _ _ _ _ _ __
User's Name: _ _ _ _ _ _ _ _ _ _ _ _ _ __
Telephone: _ _ _ _ _ _ _ _ __
Company: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __
Office/Department: _ _ _ _ _ __
Street Address: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __
City jState/Zip Code: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __
Please list any discrepancy found in this manual by page, paragraph, figure, or table number in
the following space. If there are any other suggestions that you wish to make, feel free to
include them. Thank you.
Location in Manual
Commen t/Suggestion
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NO POSTAGE NECESSARY IF MAILED IN U.S.A.
FOLD ON TWO LINES (LOCATED ON REVERSE SIDE), STAPLE AND MAIL
FOW
FIRST CLASS
Permit No. 6189
HOuston. Texas
BUSINESS REPLV MAIL
No postage necessary if mailed in the United States
Postage will be paid by
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TEXAS INSTRUMENTS INCORPORATED ;
DIGITAL SYSTEMS DIVISION
P.O. BOX 1444
ATTENTION: TECHNICAL PUBLICATIONS
MIS 670
FOLD
HOUSTON. TEXAS 77001
Sales and Service Offices of Texas Instruments are located
throughout the United States aOGht major countries
overseas. Contact the DigitaiSystems Division, Texas
Instruments Incorporated, P.O. Box 1444, Houston,
Texas 77001, or call (713) 491-5115, for the location of .~
..o...... .
the office nearest to you.
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Texas Illstruments reserves the right to change its product
offerings at any time :"ithout notice.
and~rvice,
TEXAS IN STRUMENTS
INCORPORATED
Printed in U.S.A.
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