Input/Output Interfaces - Facit 4431 Service Instruction

TABLE OF CONTENTS continues
7.3.4
7.3.4.1
7.3.4.2
7.4
7.4.1
7.4.2
7.4.3
7.4.3.1
7.4.3.2
7.4.3.3
7.4.3.4
7.4.3.5
7.4.3.6
7.5
7.5.1
7.5.2
7.5.3
8
8.1
8.2
8.3
9
9. 1
9. 1. 1
9.2
9.3
9.4
9.5
9.5.1
9.5.2
9.5.3
9.6
9.7
9.8
APPENDIX 1
APPENDIX 2
APPENDIX 3
APPENDIX 4
APPENDIX 5
APPENDIX 6
APPENDIX 7
APPENDIX 8
APPENDIX 9
APPENDIX 10
APPENDIX 11
APPENDIX 12
NON-MASKABLE INTERRUPT _ _ _ _ _ _ _ _ _ _ _ _ _ _ 19
Non-smooth scroll or full screen window
I
Smooth scroll or scrolling window 20
VIDEO GENERATOR
I
CHARACTER FONT
DISPLAY SEQUENCING 21
DISPLAY TIMING GENERATION I
Single wide characters 22
Double wide characters
I
Double high characters
Effect of the attribute bits
Retrace blanking 23
Brightness control and video output
I
INPUT/OUTPUT INTERFACES 24
BAUD RATE CLOCK GENERATION
DART OPERATIONS
KEYBOARD COMMUNICATION
M 0 N I T 0 R A N D P 0 W E R S U P P L Y
GENERAL
MONITOR
POWER SUPPLY _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 25
S E R V I C E
TROUBLESHOOTING AND FAULT ISOLATION
POWER-UP SELF-TEST
SUBASSEMBLY DIAGNOSIS
KEYBOARD FAULT DIAGNOSIS
TESTING THE MONITOR--------------- 26
DISASSEMBLY 27
MONITOR REPLACEMENT
MAIN LOGIC BOARD REPLACEMENT
ACCESS TO KEYBOARD
ADJUSTING THE MONITOR
POWER SUPPLY _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 28
TROUBLESHOOTING BY SYMPTOM 29
I
4431 CPU CIRCUIT DIAGRAM 1(5) _ _ _ _ _ _ _ _ _ _ _ 30
4431 MEM CIRCUIT DIAGRAM 2(5) 31
4431 SG CIRCUIT DIAGRAM 3(5) 32
4431 VG CIRCUIT DIAGRAM 4(5) 33
4431 I/0 CIRCUIT DIAGRAM 5(5) 34
4431 MAIN LOGIC BOARD 35
4431 KEYBOARD SCHEMATIC 36
4431 KEYBOARD/KEY CAP ASSY. 37
4431 MONITOR SCHEMATIC 38
4431 MONITOR PRINTED CIRCUIT BOARD 39
4431 POWER SUPPLY SCHEMATIC 40
4431 POWER SUPPLY PRINTED CIRCUIT BOARD 41
43