Table Of Contents - Sony HCD-MC3AV Service Manual

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SERVICING NOTES
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, observe
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 repeatedly.
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be damaged
by heat.
TE
L 13942296513
Flexible Circuit Board Repairing
• Keep the temperature of the soldering iron around 270 ˚C during
repairing.
• Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
• Be careful not to apply force on the conductor when soldering or
unsoldering.
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TABLE OF CONTENTS

1. GENERAL
FRONT PANEL ···································································· 5
REAR PANEL ······································································· 6
2. DISASSEMBLY
······························································· 8
3. TEST MODE
··································································· 16
4. MECHANICAL ADJUSTMENTS
5. ELECTRICAL ADJUSTMENTS
Deck Section ········································································ 21
CD Section ··········································································· 25
6. DIAGRAMS
6-1. Block Diagram CD Section ············································ 27
Block Diagram Main Section ········································· 29
Block Diagram Audio Section ········································ 31
6-2. Circuit Boards Location ··················································· 33
6-3. Printed Wiring Board BD Section ·································· 35
6-4. Schematic Diagram BD Section ···································· 37
6-5. Printed Wiring Board CD Motor Section ······················· 39
6-6. Schematic Diagram CD Motor Section ·························· 41
6-7. Printed Wiring Board Audio Section ······························ 43
6-8. Schematic Diagram Audio Section ································· 45
6-9. Printed Wiring Board Leaf SW Section ························· 47
6-10. Schematic Diagram Leaf SW Section ···························· 49
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6-11. Printed Wiring Board Main Section ······························· 51
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6-12. Schematic Diagram Main (1/5) Section ························· 53
6-13. Schematic Diagram Main (2/5) Section ························· 55
6-14. Schematic Diagram Main (3/5) Section ························· 57
6-15. Schematic Diagram Main (4/5) Section ························· 59
6-16. Schematic Diagram Main (5/5) Section ························· 61
6-17. Printed Wiring Board Panel Section ······························· 63
6-18. Schematic Diagram Panel Section ································· 65
6-19. Printed Wiring Board Surround Amp Section ················ 67
6-20. Schematic Diagram Surround Amp Section ··················· 69
6-21. Schematic Diagram Power Section ································ 71
6-22. Printed Wiring Board Power Section ····························· 73
6-23. Waveforms ········································································ 75
6-24. IC Pin Function Description ············································· 76
6-25. IC Block Diagrams ··························································· 84
7. EXPLODED VIEWS
8. ELECTRICAL PARTS LIST
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····················································· 86
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