Omron 8025G User manual

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MAINTENANCE
MANUAL

8025 CRT TERMINAL
MAINTENANCE MANUAL
OMRON CORPORATION OF AMERICA
INFORMATION PRODUCTS DIVISION
432 TOYAMA DRIVE, SUNNYVALE, CA. 94086
[phone]
TWX 910-339-9341

OMRON PIN 88-036-XXX
No information contained herein may be
reproduced
or disseminated to any person
or company without the express written
permission of Omron Corporation of
America. Information Products Division.
October 1, 1975
(U)

FOREWORD
This manual gives accurate, usable information to help you get the best
service from your 8025 CRT Terminal.
It supplies you with the details needed to:
• become thoroughly familiar with the 8025
• operate the 8025
understand how the 8025 operates
• service the 8025
We have taken care to make this manual as complete, accurate,' and under-
standable as possible. Your comments and suggestions for increasing its quality
and effectiveness will be most welcome. A convenient, pre-addressed "Publication
Change Request" form for this purpose is provided on the next page.
To receive updated materials, ~our manual must be registered with Omron.
A pre-addressed form is also supplied for this purpose.
(iii)

TABLE OF CONTENTS
SECTION
PAGE
List of Figures
xiv
List of Tables
xvi
1 General Information
· · · · · 1-1
_1.1
General Description
· · · · · 1-1
1.1.1
Functional Description
1-1
1.1. 2 Mechanical
Description
Of
1-2
1.1. 3
Basic Operation
·
1-3
1.2
Specifications
· · · · · . . . . . . . . . 1-4
1.
2.1 Standard Terminal Specifications
1-4
1.3
Warranty Information
· · · · . .
1-8
1. 3.1 Claim
for Transit Damage
1-8
1. 3.2 Statement
of OM RON Warranty
1-8
1. 3. 3 Warranty Claims
Against OMRON
1-8
1. 3. 4
OMRON Designated Facility
1-9
1. 3. 5 Suppliers Warranties
1-9
1.4 Repair and Return of Equipment
1-10
1. 4.1 P"olicy · · · · · · · 1-10
1. 4.2
Equipment Failure
· · ·
1-10
1. 4.3
Non-repairable Determination
1-10
1.4.4 Equipment Return Procedure
1-10
1. 4.5 Packing and Packaging Procedure
1-10
1.5 List of OMRON Mnemonics 1-12
2
Installation
and Checkout 2-1
2.1 Unpacking Procedure
2-1
2.1.1
Inspection
2-1
2.1.2 Unpacking · 2-1
•
2.2
Off-line Checkout 2-2
2.2. 1 Mechanical
Inspection
2-2
2.2.2 Operational Check . . . . 2-7
2.3
Installation
. · · · · · · 2-7
2.3.1 Physical Requirements · . . . .
2-7
2.3.2 Electrical
Requirements
2-7
2.3.3 External Connections
2-8
2.3.4 RS-232 Speed Adjustment 2-8
2.4
On-line Checkout · · · · · · · . . • . 2-8
Ox)

SECTION
TABLE OF CONTENTS
(continued)
3 Operating Instructions
3.1 Operating Controls.
3.1.1 On-Off Switch.
3.1.2 Brightness Control
3.1.3 Baud Rate Switch
3.1.4 Parity Switch
. . .
3.2 The Display Screen.
3.3 Audio Indicators.
3.4
3.5
3.6
3.3.1 The Click Sound
3.3.2
The Beep Sound
Visual
Indicators
Basic Operating Modes
3.5.1
KSR Mode
3.5.2
ASR Mode
. . . .
Keyboard Keys
3.6.1
3.6.2
3.6.3
3.6.4
3.6.5
3.6.6
3.6.7
Operating Features
"Typewri ter" Keys . .
Numeric Pad
Keys
Escape (ESC) and Control (CTRL) Keys
Cursor Control Keys . . . . • • .
Next Line
(.J) Key . . . . .
Function Keys and Indicators
3.7 I~dividua1 Key Descriptions
3.7.1 A1phanumeric-Punctuation-Symbo1
3.7.2 Store Input Key/Indicator ...
3.7.3 Storage Transmit Key/Indicator
3.7.4 KSR Mode Key/Indicator
3.7.5 Print Key
3.7.6 Store Key ... .
3.7.7 Read Key ... .
3.7.8 Keyboard Disabled Indicator.
3~7.9 Received Parity Error Indicator
3.7.10 Frame Transmit Key
3.7.11 Local Copy Key/Indicator
3.7.12 Break Key ..••
3.7.13 Reset Key ...•.
3.7.14 Screen Erase Key
3.7.15 Control (Cl'RLJ Key
3.7.16 Shift Key
3.7.17 Lock Key
3.7.18 Space Bar.
3.7.19 Tab Key.
3.7.20 Line Feed Key
(x)
Keys
.' .
P
3-
3-
3-
3-
3-
3-
3-
3-
3-
3-
3-.
3-,
3-:
3-:
.. (-{
. 3-
i
'C~',)-i
• 3-L1
3-4
3-4
3-4
3-4
3-5
3-5
3-5
3-5
3-5
3-6
3-6
3-6
3-6
3-6
3-7
3-7
3-7
3-7
3-7
.... 0
3-7
. . Ii. .... :8
. V8
3-8

SECTION
TABLE OF CONTENTS
(continued)
3.7.21 Carriage Return (CR) Key
3.7.22 Delete (DEL) Key ..•.
3.7.23 Backspace (BS) Key
3.7.24 Cursor Control (HOME and Arrow) Keys
3.8 Operating Procedures .....
3.8.1
3.8.2
Turning the Terminal Qn and Off
Clear/Reset Functions
4 Theory of Operation
4.1 Terminal Block Diagram Analysis
4.1.1 Timing, Control, and Data Signals.
4.1.2 Typical Operating Sequences ..•
4.2 8025 CRT Terminal Input/Output Structure
4.2.1
4.2.2
4.2.3
Memory Cards .. . . . . . . . .
Program-Processor Controlled I/O Cards
DMA Transfer I/O Cards
4.3 Character Generation ....
4.3.1
4.3.2
Upper Case Characters
Lower Case Characters
4.4 Card/Section Descr"iptions
4.4.1 Power Supply
4.4.2 CRT Display ....
4.4.3 Timing Control Card
4.4.4 Processor Card
4.4.5 PROM Card .....
4.4.6 Buffered RAM (Refresh) Memory Card
4.4.7 Refresh Buffer Card.
4.4.8 Refresh Control Card
4.4.9 Cursor Control Card
4.4.10 Video Control Card
4.4.11 The Keyboard
4.4.12 RS-232 Interface Card
4.4.13 Terminator Card ...
5 (Not Applicable to 8025G Terminal)
6 Maintenance and Repair
6.1 Preventive Maintenance
Obj ecti ve . . • . 6.1. 1
6.1.2
6.1. 3
6.1.4
Required Equipment and Materials
General Procedure .
Specific Procedures . .
(xi)
. . . .
. . . .
PAGE
3-8
3-8
3-8
3-8
3-11
3-11
3-11
4-1
4-1
4-1
4-4
4-6
4-6
4-16
4-16
4-17
4-17
4-20
4-21
4-21
4-23
4-29
4-39
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4-48
4-56
4-58
4-62
4-67
4-71
4-79
6-1
6-1
6-1
6-1
6-1
6-2

. SECTION
TABLE OF CONTENTS
(continued)
7
6.2 Field Maintenance
6.2.1
6.2.2
6.2.3
6.2.4
6.2.5
Objective ..•.•.
Required Equipment
Rules
of Good Maintenance . . .
Field Troubleshooting Procedure . .
Removal and Replacement
Procedures
6.3 Bench Maintenance
6.3.1
6.3.2
6.3.3
6.3.4
6.3.5
"'-6.3.6
6.3.7
6.3.8
Adjustments
Objective .•.....•..••
Required Equipment and Materials
Rules of Good Maintenance .
Replaceable Parts . . . • . . • .
Workmanship . • . . . . • • • • . .
General
Troubleshooting Procedure
Specific Troubleshooting Procedures
Removal and Replacement Procedures
.
7.1 Required Equipment
7.2
7.3
7.4
+5 V dc Regulated Output
Click/Beep Volume
CRT Disp1ay.Adjustments
7.4. 1
7.4".2
7.4.3
7.4.4
7.4.5
7.4.6
7.4.7
7.4.8
Preliminary Procedure .
+55 V dc (B+) Adjust
Video Gain .• • . • .
Vertical Adjustments
Horizontal Adjustments
Centering Adjustments
Yoke Adjustments
Focus . . • • .
8 Drawings
CUl'sor Control
Display Monitor
Keyboard . .
L.E.D
....
Mother Board
Power Supply
Processor Card
PROM Card
Card
RAM Card ..•
Refresh Buffer Card
Refresh Control Card
Regulator Card .
RS-232 Interface Card
(xii)
• "#
"
. "
PAGE
6-3
6-3
6-3
6-4
6-4
6-13
6-19
.6-19
6-19
6-20
6-20
6-20
6-21
6-22
6-52
7-1
7-2
7-2
7-3
7-3
7-5
7-5
7-12
7-12
7-12
8-1
8-1
8-3
8-5
8-7
8-9
8-11
8-15
:~"
8-21
g
8-27

SECTION
Terminator Card
Timing Control Card
Video Control Card .
TABLE OF CONTENTS
(continued)
9 Component Parts List . . • .
Cursor Control Card
Keyboard •. .. • •
L.E.D ...•
Mother Board
Power Supply •
Processor Card •
PROM Card
RAM Card ..•
Refresh Buffer Card
Refresh Control Card
Regulator Card . • •
RS-232
Interface Card
Terminator Card
Timing Control Card
Video Control Card
10 References
10.1 EIA Standard RS-232.C
10.1.1 Transmit Vata (BA), Pin 2
10.1.2 Receive Vata (BB), Pin 3
10.1.3 Request to Send (CA), Pin 4
10.1.4 Clear to Send (CB), Pin 5 .
10.1.5 Data Set Ready (CC), Pin 6
10.1.6 Received Line Signal Detector (CF), Pin 8 .
10.1.7 Data .Terminal Ready (CD), Pin 20
10.1.8 Ring Indicator (CE), Pin 22 .
10.2 ISO Character Assignments
10.2.1 Mne~onics and Their Definitions
10.2.2 The ASCII Code
10.2.3 Tape Track Assignments
List of Abbreviations
Glossary
(xi it)
PAGE
8-29
8-31
8-33
9-1
9-1
. . . .. 9-3
9-4
9-4
9-5
9-6
9-7
9-9
9-11
9-12
9-13
9-14
9-15
9-16
9-18
10-1
10-1
10-1
10-1
. 10-1
10-1
10-1
10-1
. 10-1
10-2
10-3
10-3
10-4
10-5
A-I
G-1

FIGURE
1-1
1-2
1-3
1-4
2-1
2-2
2-3
2-4
2-5
2-6
2-7
2-8
3-1
4-1
4-2
4-3
4-4
4-5
4-6
4-7
4-8
4-9
4-10
4-11
4-12
4-13
4-14
4-15
4-16
4-17
4-18
4-19
LIST OF FIGURES
Keyboard arrangement • • • • •
Exterior of 8025 CRT terminal
Interior of 8025 CRT terminal
8025 CRT terminal, simplified block diagram
Cabinet mounting screws (front)
Cabinet mounting screws (rear) . • • • • •
. . . .
CRT display high voltage circuits (mounted below Monitor
Deflection Board) ••• • • , • • • •
Printed circuit card locations • • •
Monitor Deflection Board connections (viewed from top of terminal) •
Flat cable connections • • • • • •
Flat-line connector configurations •
8025 CRT terminal: rear panel connectors
8025 CRT terminal keyboard • • • • •
8025 CRT terminal block diagram
Example
of upper case character (H)
Example of upper case character (V)
Example of lower case character (h)
Example of lower case character (p)
Power supply block diagram
CRT display block diagram
CRT waveforms
Timing
control card block diagram
Timing
control card timing diagram .
Timing control card timing diagram
Processor card block diagram • • . •
Processor card (CPU) timing diagram
Buffered
PROM board block diagram •
Buffered RAM memory card block diagram •
Refresh buffer card block diagram
Refresh
buffer/control card timing diagram •
Refresh control card block diagram • •
Cursor
control card block diagram
(xiv)
..
. .
..
PAGE
1-1
1-2
1-3
1-3
2-1
2-2
2-3
2-4
2-4
2-5
2-6
2C-
3-9
4C;
4-18
4-19
4-20
4-21
4-22
4-24
4-26
4-31
4-33
4-35
4-40
4-43
4-45
4-47
4-C
:~~
4-59