Sinclair QL manuals

Sinclair QL Service Manual (45 pages)

Brand: Sinclair | Category: PC/workstation barebones | Size: 1.87 MB |

English

Table of contents

Sinclair QL Service Manual

2

SECTION 1

3

SYSTEM DESCRIPTION

3

DS R/W D0-D7

4

Function Code Output

4

Cycle Type

4

FC2 FC1 FC0

4

5. MEMORY ORGANISATION

7

7. MICRODRIVE

8

8. POWER SUPPLIES

9

FIGURE 1.3 QL BLOCK DIAGRAM

10

SECTION 2

11

DISASSEMBLY/ASSEMBLY

11

2. ASSEMBLY

12

SECTION 3

13

SYSTEM TEST

13

3.5 RS232C Loopback Test

14

3.2 Colour Test

14

3.3 Sound Test

14

3.4 Network Test

14

3.6 Keyboard Test

15

3.7 Joystick Test

15

3.8 Real-Time Clock Test

15

3.9 Microdrive 2 Test

15

3.10 Microdrive 1 Test

16

3.12 End of Test

17

SECTION 4

18

FAULT DIAGNOSIS AND REPAIR

18

2. FAULT DIAGNOSIS

19

F1...MONITOR

20

F2...TELEVISION

20

© 1983 Sinclair Research Ltd

20

SYMPTOM REMEDY

22

2.5 Video

23

2.6 Fault-Finding Guide

23

3. REPAIR

24

4. FIRMWARE UPGRADE

24

FIGURE 4.2 KEYBOARD FORMAT

25

FIGURE 4.3 HEAD CHASSIS

25

APPENDIX A TO SECTION 4

26

KNOWN BUGS AND THEIR REMEDIES

26

1. MONITOR CONNECTIONS

26

2. KNOWN BUGS

26

3. PRINTING PROBLEMS

27

4. SER OUTPUTS

28

5. HOW TO CURE A CRASHING QL

28

6. FLICKERING DISPLAYS

28

APPENDIX B TO SECTION 4

29

USER HINTS

29

APPENDIX C TO SECTION 4

30

MANDATORY MODIFICATIONS

30

APPENDIX D TO SECTION 4

32

MICRODRIVE FAULT FINDING

32

3.4 Erase Check

33

340 PAUSE 50

34

350 SAVE ser1

34

360 END DEFine

34

SECTION 5

36

PARTS LISTS

37

4. NOTES TO TABLES

38

Description Manufacturer/Type

39

Circuit Ref

39

MDV1 MDV2

39

Table of Contents

44

Sinclair devices