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4431
Service instruction
Facit 4431 Service Instruction
Video terminal
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Table of Contents
Power On/Performance Check
E C E I V
Power and Signal Wiring
I N S P E C T I 0 N
Installation
Initial Setting-Upi
Access to Main Logic Board in Display Unit
Access to Keyboard Pcb
Keyclick/Bell Volume Adjustment
Jumpers on the Main Logic Board
Facit 4431 Selection (W2)
National Keyboard Selection (W4,5,6)
Keyboard Pcb
Main Logic Board
Standard/Extended Character Generator (W3)
Production Test (W4)
Disable/Enable Save (W5)
Composite Video Output
General Features of Set-Up Mode
Features
Current Loop Interface
V.24/Rs-232-C Printer Interface
V.24/Rs-232-C Communication Interface
Set-Up Mode Summary
Microprocessor Control
Video Generator
Micro-Processor Control Uniti
Wait State Generation
Ear Om
Screen Attribute Latch
Program Memory Access
Display Refresh Memory
WRITING to the ASCII (Character) DISPLAY MEMORY
READING the ASCII ·(Character) DISPLAY MEMORY
WRITING/READING the ATTR (Attribute) DISPLAY RAM
Crt Controller (Crtc)
Dot Oscillator
Memory Share Signal
Non-Maskable Interrupt
Character Font
Smooth Scroll or Scrolling Window
Video Generator
Display Timing Generationi
Display Sequencing
Single Wide Characters
Double Wide Characters
Double High Characters
Effect of the Attribute Bits
Retrace Blanking
Brightness Control and Video Output I
M 0 N I T 0 R a N D P 0 W E R S U P P L y
Power Supply
Monitor
Baud Rate Clock Generation
General
Keyboard Communication
Dart Operations
Power Supply
Keyboard Fault Diagnosis
Subassembly Diagnosis
Power-Up Self-Test
Troubleshooting and Fault Isolation
E R V I C E
Troubleshooting by Symptom
Appendix 2
4431 Cpu Circuit Diagram 1(5)
4431 Mem Circuit Diagram 2(5)
Appendix 3
4431 Sg Circuit Diagram 3(5)
Appendix 4
4431 Vg Circuit Diagram 4(5)
Appendix 5 4431 I/0 Circuit Diagram 5(5)
Appendix 6
Appendix
4431 Keyboard Schematic
Appendix 10
Appendix 10 4431 Monitor Printed Circuit Board
Display Refresh Memory/Specifications
Display Refresh Memory
Specifications
Input/Output Interfaces
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I
'DETAILED LIST OF CONTENT AT PAGES 42-43
~
SERVICE INSTRUCTION 4431
Edition
1
Pub 1 • No.
1160
82 17-12/8
Eng.
DECEMBER 1982
K.F.
Printed in Sweden
VIDEO TERMINAL ...... _ _
Facit AB · Technical Service Department · S-597 00 ATVIDABERG ·SWEDEN
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Display Refresh Memory/Specifications
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Table of Contents
Troubleshooting
E R V I C E
25
TROUBLESHOOTING BY SYMPTOM
29
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