Table Of Contents - Sony HCD-VX90AV Service Manual

1. SERVICING NOTE
.......................................................... 4
2. GENERAL
.......................................................................... 7
3. DISASSEMBLY
3-1. Loading Panel ....................................................................... 9
3-2. Front Panel ............................................................................ 9
3-3. Cassette Lid and Tape Mechanism ...................................... 10
3-4. CD SW Board and Panel Board .......................................... 10
3-5. Disc Tray ............................................................................. 11
4. TEST MODE
..................................................................... 12
5. MECHANICAL ADJUSTMENTS ..........................
6. ELECTRICAL ADJUSTMENTS
7. DIAGRAMS
7-1. Circuit Boards Location ...................................................... 18
7-2. Block Diagrams
• CD Section ....................................................................... 19
• Video Section ................................................................... 21
• Deck Section .................................................................... 23
• Main Section .................................................................... 25
• Power Section .................................................................. 27
• Display Section ................................................................ 29
7-3. Printed Wiring Board - BD Section - ................................. 33
7-4. Schematic Diagram - BD Section - ................................... 35
7-5. Schematic Diagram - Deck Section - ................................ 37
7-6. Printed Wiring Board - Deck Section - .............................. 39
7-7. Printed Wiring Board - Video Section - ............................. 41
7-8. Schematic Diagram - Video (1/3) Section - ....................... 43
7-9. Schematic Diagram - Video (2/3) Section - ....................... 45
7-10. Schematic Diagram - Video (3/3) Section - .................... 47
7-11. Printed Wiring Board - Main Section - ........................... 49
7-12. Schematic Diagram - Main (1/4) Section - ..................... 51
7-13. Schematic Diagram - Main (2/4) Section - ..................... 53
7-14. Schematic Diagram - Main (3/4) Section - ..................... 55
7-15. Schematic Diagram - Main (4/4) Section - ..................... 57
7-16. Printed Wiring Board - Leaf SW Section - ..................... 59
7-17. Schematic Diagram - Leaf SW Section - ........................ 59
7-18. Printed Wiring Board - Panel Section - ........................... 61
7-19. Schematic Diagram - Panel (1/2) Section - ..................... 63
7-20. Schematic Diagram - Panel (2/2) Section - ..................... 65
7-21. Schematic Diagram - Surround Section - ....................... 67
7-22. Printed Wiring Board - Surround Section - ..................... 68
7-23. Schematic Diagram - Front Amp Section - ..................... 69
7-24. Printed Wiring Board - Front Amp Section - .................. 71
7-25. Schematic Diagram - CD Motor Section - ...................... 73
7-26. Printed Wiring Board - CD Motor Section - ................... 75
7-27. Schematic Diagram - Trans Section - ............................. 77
7-28. Printed Wiring Board - Trans Section - ........................... 78
7-29. IC Block Diagrams ........................................................... 79
7-30. IC Pin Functions ............................................................... 82

TABLE OF CONTENTS

8. EXPLODED VIEWS
8-1. Case Section ........................................................................ 92
8-2. Chassis Section ................................................................... 93
8-3. Front Panel Section ............................................................. 94
8-4. CD Mechanism Deck Section-1 (CDM38L-5BD34L) ....... 95
8-5. CD Mechanism Deck Section-2 (CDM38L-5BD34L) ....... 96
8-6. Base Unit Section (BU-5BD34L) ....................................... 97
8-7. TC Mechanism Section-1 (TCM230AWR2/230PWR2) .... 98
8-8. TC Mechanism Section-2 (TCM230AWR2/230PWR2) .... 99
9. ELECTRICAL PARTS LIST ..............................
13
............................... 13
NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK
OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostatic
break-down because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused on
the disc reflective surface by the objective lens in the optical pick-
up block. Therefore, when checking the laser diode emission, ob-
serve from more than 30 cm away from the objective lens.
LASER DIODE AND FOCUS SEARCH OPERATION
CHECK
Carry out the "S curve check" in "CD section adjustment" and check
that the S curve waveform is output four times.
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