Omni 820 KSR User manual

.Maintenance
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Model,820,.KSR
:, '.' Jerrhi"raal'
'. Mamiel No.999853-9701 .
. , ~C£_R 1978"
T£XASINSTRUM EN Tiitp;
'4 . . ~
- 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.
No copies of the information or drawings snarf be made without the prior consent of
Texas
Instruments Incorporated. .
CHANGE NOTICES
R .. ilion
ECN
Description
Letter
Date Number Level
.
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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:
SECfIONI
SECTION II
::
SECTION III
SECTION IV
SECTION V
SECTION VI
SECTION VII
APPENDIX A
. APPENDIXB
APPENDIXC
APPENDIXD
APPENDIXE
APPENDIXF
General Description: This section contains a list of terminal specifications and
features, locates the major terminal components, and identifies the various terminal
versions and options.
InstaUation: This section provides instructions for selecting a suitable site for the
terminal, installing the supplies, making cable connections, applying power, per-
forming terminal checkout, and configuring the terminal.
Operation: This section provides a complete functional description of the terminal
including the use
of controls and indicators.
Theory of Operation: This section identifies the functional components of the
terminal and provides detailed discussions
of the operation of each functional
.component.
.Maintenance: This section contains preventative and corrective maintenance pro-
cedures, adjustment procedures, and removal and replacement procedures for all
replaceable assemblies.
Assembly Drawings and Parts Lists: This section contains assembly drawings and
parts lists for all replaceable assemblies.
Diagrams: This section contirins logic diagrams.
Character SetDotMatrix
Character and ControlCodes
TerminalOptions
and Accessories
Ribbon
and Paper Recommendations
InstaUation Instructions
For Option Kits
Glossary of LogicSignals
iii/iv

TABLE OF CONTENTS
Paragraph
Title Page
SECTION I. GENERAL DESCRIPTION
1.1 Introduction ............................................................ 1-1
1.2 Features and Specifications ................................................ 1-1
1.3 Options ...... : ......................................................... 1-1
1.4 Accessories ......................................... . . . . . . . . . . . . . . . . . . .. 1-3
1.5 Identification ........................................................... 1-3
SECTION II. INSTALLATION
2.1 Introduction ............................................................ 2-1
2.2 Space Requirements ..................................................... 2-1
2.3 PowerCordConnection ................................................... 2-2
2.4 PaperLoading .......................................................... 2-3
2.5 Ribbon Installation ........................................................ 2-4
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
Power-On Procedure ..................................................... 2-5
Power-OffProcedure ..................................................... 2-6
Operational Checkout and Printhead Adjustment
............................... 2-6
Configuration ParameterSelection
.......................................... 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 ParameterEntry
............................................ 2-15
Initiate Configuration
............................................... 2-15
Review Current Configuration
........................................ 2-15
Enable Mutually Exclusive Parameters
................................. 2-16
EnableON/OFFParameters
.......................................... 2-16
Disable ON/OFFParameters
......................................... 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

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
TABLE OF CONTENTS (Continued)
TItle ~
Operator's Panel .............. '.' '.' . ',' ........... , ........................ 3-1
Control Panel ....... '.. . . . . . . . . •. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-1
LINE/-/LCLSwitch ............................................ 3-1
VIEW/OFF Switch (Last CharacterVisibility .......................... 3-1
LINE ROY and CARR RCV Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-3
Tenninal Status Display (TSD)
.................................... 3-3
Special Function Keys
........................................... 3-6
TypewriterKeyboard ................................................ 3-6
Code Generating Keys
........................................... 3-6
lIEREIS Key .................................................. 3-7
Numeric Keypad Option
.............................................. 3-7
CONFIGURE/OPERATE Switch ...................................... 3-7
Audible Tone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-8
Printer
..... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...... '. . . . . . . . . .. 3-8
CharacterSet and Font
....................................... :........ 3-8
. FonnatParameters
.................................................. 3~8
End-of-Line Alann ................................................. 3-10
PrinterOperation
................................................... 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
MechanismFailure Detection
......................................... 3-11
DataBuffering and PrinterThroughput
................................. 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-DefmedConfiguration Sets
...................................... 3-20
Alternate CharacterSet-ASCII/APL
.................................. 3-21
Numeric Keypad
.................................................... 3-22
Operator's Reference Cards
............................................... 3-23
vi

Paragraph
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
TABLE OF CONTENTS (Continued)
Title Page
SECTION IV. THEORY OFOPERA nON
General .......................... ..................................... 4-1
Power Supply ........................................................... 4-2
Input Voltage Selection and Rectification
......... : ...................... 4-3
Soft-Start Circuit .................................... , ............... 4-4
Blocking OscillatorCircuit
............................................ 4-5
Reference Sensing Circuit
............................................ 4-5
Secondary Filtering and Regulation Circuits
.............................. 4-5
Power-Good Circuit ................................................. 4-6
Terminal ControllerSubsystem
............................................. 4-6
TMS 9980 Microprocessor ............................................ 4-7
Terminal ControllerMemory
.......................................... 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
SystemClock and Interrupt Logic
.................. . . . . . . . . . . . . . . . . . . .. 4-8
OperatorInterlace
....................................................... 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 MotorDrive
................................................ 4-12
Ribbon MotorDirection
............................................. 4-13
Terminal Controller/PrinterController Interface
............... . . . . . . . . . . . . . .. 4-13
Printer Controller Subsystem
.............................................. 4-15
PaperDrive Subsystem .................................................. 4-16
PaperMotorDriver Circuit ........................................... 4-16
Paper-Out Detection ................................................ 4-17
Printhead Carriage Drive Subsystem
........................................ 4-17
Printhead Positioning
............................................... 4-17
Carriage Jam Detection
.............................................. 4-19
CharacterPrinting
...................................................... 4-19
vii

Par8llJ'llPh
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
TABLE OF CONTENTS (Continued)
Title Page
SECI10N V. MAINTENANCE
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 CouplerTransmit 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 ofTerminal 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 orEmulator 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 ofPaper 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

APPENDIX A
APPENDIXB
APPENDIXC
APPENDIXD
APPENDIXE
APPENDIXF
INDEX
Table No.
TABLE OF CONTENTS (Concluded)
SECTION VI. ASSEMBLY DRAWINGS AND LISTS OF MATERIALS
SECTION VII. DIAGRAMS
APPENDICES
CharacterSetDot Matrix
USASCII/APL Codes
Model 820 KSR Tenninal Options and Accessories
Omni 800Model 820 Printer Ribbon and PaperRecommendations
Installation
of Optional Kits
Glossary
of Model 820 KSR Logic Signals
LIST OF TABLES
Title
1-1 Model 820 KSR Specifications ............................................. 1-2
2-1 Configuration Codes
..................................................... 2-9
2-2 113A/103, 202/212 Data SetCable (TI Part No. 993205-(01)
................... 2-19
3-1 LINE ROY and CARRRCV Indicators ...................................... 3-4
3-2 Status Codes
............................................................ 3-4
3-3 Interpreting Tenninal Status Display (TSD) Functions
........................... 3-5
3-4 Audible Tone Operation
..................... . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-8
3-5 . Interface Signals
......................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-13
3-6 Device Control Commands
............................................... 3-19
3-7 Forms Control Commands
................................................ 3-20
4-1 MotorDriver Acceleration Control Output ................................... 4-18
5-1 820 KSR Failure Analysis Chart
............................................ 5-8
5-2 Option PROM/ROM Part Numbers and Locations
............................. 5-11
5-3 Strappable Option on Logic PWB (999694-000
1) ............................. 5-11
ix

LIST OF ILLUSTRATIONS
Figure No. Title Page
1-1 Omni800 Model 820 KSR Terminal ......................................... 1-3
2-1
2-2
2-3
2-4
2-5
2-6
2-7
2-8
2-9
3-1
3-2
3-3
3-4
3-5
3-6
3-7
4-1
4-2
4-3
4-4
4-5
4-6
4-7
4-8
4-9
4-10
4-11
5-1
5-2
5-3
6-1
Physical Dimensions
................. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-1
Model 820 KSR RearPanel
................................................ 2-2
PaperLoading
.......................................................... 2-3
Ribbon Installation
....................................................... 2-4
Power-on Procedure Switches
.............................................. 2-5
Controls for Model 820 KSR Self-Test
....................................... 2-6
Self-TestResults
........................................................ 2-7
Communications Interface Cable Connections
................................ 2-18
DataTerminal Cable (TI Part No. 0993210-0001)
............................. 2-19
OMNI 800 Model 820KSR DataTerminal 3-2
The Operator's Panel
..................................................... 3-3
CONFIGURE/OPERATE Switch
........................................... 3-7
Format Parameters
....................................................... 3-9
APLKeyboard
......................................................... 3-22
Control Panel, USASCII/APL Option
...................................... 3-22
Numeric Keypad
....................................................... 3-23
Model 820 KSR, Simplified Functional Block Diagram
.. . . . . . . . . . . . . . . . . . . . . . .. 4-1
Power Supply Block Diagram
.............................................. 4-2
Input Voltage Selection and Rectification
..................................... 4-3
Soft-StartCircuit
........................................................ 4-4
Terminal ControllerSimplified Block Diagram
.............•... -............... 4-6
Keyboard Matrix SimplifiedDiagram
.................... :................... 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
Printhead Area, Guide Rods, and Ribbon Guide ................................ 5-2
Normal Results
of Barberpole Test .......................................... 5-5
Logic PWB Battery Details
............................................... 5-16
Model 820 KSR Illustrated Major Assemblies
................................. 6-2
x