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

SECTION I
GENERAL DESCRIPTION
1.1 INTRODUCTION
The Texas Instruments Omni 8()()* Model 820Keyboard-Send Receive (KSR)Tenninal shown in Figure 1-1
consists basically of
• Aprinterwhichprovides one original and up to five copies of data received via a communications
interface.
• Anoperator'spanelwhichpennitsentry of dataon the keyboardfortransmission to a host system
or otherterminals via a communications interface.
1.2 FEATURES AND SPECIFICATIONS
The Model 820 KSR is a compactself-containeddata tenninal, similarin appearance to an office typewriter,
whichcommunicates 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 atspeeds up to 150 characters persecond (CPS). Printing is done by means of aserial, wire-matrix
impact mechanism which prints on conventional paper and features multiple copy, wide carriage, and
optional fonns handling capabilities. An internal buffermemory enables the Model 820 KSR to receive burst
data at transmission rates which exceed its maximum printing speed.
The control electronics consistsprimarily 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 operatorcontrols. The modularconstruction
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-
Device/forms control-
Numeric Keypad -
*Trademark of Texas Instruments Incorporated
provides 16.5and 10.0charactersper 25.4 mm (l inch) horizontal pitch
provides extensive tenninal and fonnat capabilities, includinghorizontal
and vertical tabs, margin and fonn length control,printerON/OFF, etc.
an I8-key cluster, including a user-programmable ENTER key, similar
to a calculatorkeyboard for fast numberentry.
1-1

Table 1-1. Model 820 KSRSpecifications
POWER REQUIREMENTS
VOLTAGE: 90-130 Vac, 47-63 Hz, single phase
180-260 Vac, 47-63 Hz, single phase
POWER: 50 VA max, idle
75 VA average printing
150 VA max. executing form feed
PHYSICALDiMeNSIONS
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: 18.6kg (41 pounds) excludingoptions
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
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:
CHARAC-
TERSET:
CHARAC-
TERSPER
LINE:
CHARAC-
TERSPAC-
ING:
LINE
SPACING:
PAPER
DRIVE:
PAPER
FEED:
PAPER
WIDTH:
Wire matrix impact
150characters per second
9 x 7 dot matrix
95 ASCII plus 33 control character gra-
phics plus parity error symbol
132 max.
10per 25.4 mm (1 in.)
6 per 25.4 mm
(1 in.)
2 pinfeed tractors (4 pin)
Rear or bottom
76.2mm (3.0 in.) to 377.8 mm (14.875 in.)
1-2
PAPER
TYPE:
RIBBON:
LINE FEED
TIME:
Continuous feed, fanfold, or multipart
(original + 5 copies)
54.8 m (60 yards) or 36.58 m(40 yards),
auto reversing
30 milliseconds
PAPER SLEW RATE: 190.5
mm (7.5 in.) per second
ADJUSTMENTS: Forms width, thickness, and align-
ment
FORM LENGTH: 279.4 mm (11 in.)
DETECTION: Paper-out. carriage jam
KEYBOARD
TYPE: Full ASCII
LAYOUT: Typewriter
ROLLOVER: N-Key
INDICATORS: Terminal and Communications status
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 re-
verse 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
OPTIONS
PRINTER: Compressed print (16.5 characters-perinch)
CONTROL: Device/Forms Control
KEYBOARD: 18 key
nl,Jmeric keypad
APLIASCIl
International keyboards
INTERFACE: dccurrent loop
. 300-baud acoustic coupler
CONFIGURATION: User-specifiable default para-
meter sets
(up to eight) User-
specifiable protected parameter
sets (up to eight)

Figure 1-1. Omni 800Model 820 KSR Terminal
Alternate character sets-APL and Katakana
International keyboards- England, France, Germany, Denmark/Norway, and Sweden/Finland
keyboards and charactersets.
CommunicationsInterface-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-for userconvenience
• Noise enhancement kit -significantly reduces noise
• Interface cables-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
BasicModel820 KSR
115voltoperation
220 voltoperation
Standard EIA
RS-232.-C interface
Standardprinter
(10 charactersper inch)
Compressed printoption
(10 and 16.5
characters per inch)
Device/FormsControl (DFC) option
KEYBOARD OPTIONS
KFS Standard full ASCII
KFN Standard full ASCII with numeric pad
KAS APL/ASCII
KAN APL/ASCII withnumeric pad
KKS Katakana/ASCII
KKN Katakana/ASCII with numeric pad
COMMUNICATION OPTIONS
CAC 3OO-baud acoustic coupler
CTY 20-mAdc current loop
CONFIGURATION OPTIONS
MOP Default configuration option
MPP 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 containerand 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 particularcare not to block the cooling fan
intake and exhaustlouvers 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 printeroutut papermust also beprovided if the optional paperbasket 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 theoptional floor mounting stand is notused. 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.
14-------533MM------- .... !,
(21 IN}
14-----------660MM---------~
(26IN)
Figure2-1. PhysicalDimensions ,
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 cordreceptacle at the rear of the Model 820 KSR and proceed as follows:
a. Ensure that the powerON/OFFswitch is
in the OFF (down) position.
b. Attach the female connector
of the powercord to the tenninal power cord receptacle (next to the
ON/OFF switch).
c. Attach the male connector
of the powercord 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
COMMUNICATIONS
INTERFACE CONNECTOR
POWER CORD RECEPTACLE
ON/OFF POWER SWITCH
Figure2-2. 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 ormultipart forms meeting the specifications of
TI Publication0999860-9701, Omni BOO ModelB20PrinterRibbon and PaperRecommendations (Appendix
D) may be used. Referring to Figure 2-3, locate the controls forforms thickness adjustment(adjustlever) and
forms width adjustment(flaps) and proceed as follows:
PA 1 H 8
Figure 2-3. Paper Loading
a. Lift the terminal coverand open theflaps on both papertractors.
b. Using the printhead adjustlever, move the printhead away from the platen.
c. Feed the paperinto eitherthe rearpaperchute (path A) with the printing side
of the paperdown 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. Checkthat the papersupply is aligned inthe paperchute and that the paperdoes not rub the side
of
the paperchute.
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 0999860-
9701, Omni 800 Model 820 PrinterRibbon and PaperRecommendations (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 adjustlever, move the printhead away from the platen.
c. Place the full ribbon spool on eitherhub
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. Checkthat the empty spool ribbon eyelet
is between the spool and the shiftarm and thatthe 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 statusdisplay 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 upperedge
of the keyboard). Close the terminal cover.
TERMINAL
STATUS
DISPLAY (TSD)
LlNE/. /LCL SWITCH
CONFIGURE/OPERATE SWITCH
Figure 2-5. Power-on ProcedureSwitches
c. Set the powerON/OFF switch to the ON position (up).
d. Ascertain that the following events occur:
• Theterminal status display (TSD) shows8BB and the LED indicators are illuminated
-The printhead aligns to the left margin
-The audible tone sounds
• TheTSD showsD [J : (orthe left margin setting if the leftmargin is not set to column 1)
and the LED indicators go off.
2-5

2.7 POWER-OFFPROCEDURE
To remove powerfrom the terminal, simply set the powerON/OFF switch to the OFFposition (down). The
Model 820
KSR retains operating andformat parameters in a nonvolatile memory sothat the terminal is ready
to operate when poweris again applied.
2.8 OPERATIONALCHECKOUT AND PRINTHEAD ADJUSTMENT
Referring to Figure 2-6, locate theCTRL, SHIFT, !/1, andRESETkeys on the operators panel andproceed as
follows:
CAUTION
Do not operate the printer without ribbon and paper installed. Printhead
damage will occurand the warranty may be voided.
Texas Instruments
OMNi 800
820 KSR TERMINAL
[BREAK}
~~~
u u u
[RESEi
-
LINE ALTN CARR 0
ROY CHAR
RCV
0 0 0
LINE SO-Sl VIEW
GJ
§ §
E]
[FORM}
LCL
LOCK OFF
AOV
r----HT--t--VT--+FORI
SET CLEAR SET CLEAR SIZI
BOJ(I]GJITJG
GGJGJGJGJI
8§GJGJGJGJ
BQGJGJC
Figure2-6. Controls for Model 820 KSR Self-Test
2-6