HCD-VZ30AV, MHC-VZ30AV - Sony Audio Service Manual (repair manual). Page 3

3

• Abbreviation

EA

: Saudi Arabia model.

SP

: Singapore model.

MY

: Malaysia model.

TH

: Thai model.

HK

: Hong Kong model.

CH

: Chinese model.

4-227-555-0s

4-227-555-1s

4-227-555-2s

4-227-555-3s

4-227-555-4s

EA

MY, SP

HK

TH

CH

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6-1. Circuit Boards Location ·············································· 24
6-2. Block Diagrams ··························································· 25
6-3. Schematic  Diagram     Video CD Section (1/2) ·········· 29
6-4. Schematic  Diagram     Video CD Section (2/2) ·········· 30
6-5. Printed  Wiring Board     Video CD Section ················ 31
6-6. Printed  Wiring Board     BD Board ···························· 32
6-7. Schematic  Diagram     BD Board ······························· 33
6-8. Printed  Wiring Boards     Sensor/Motor Section ········ 34
6-9. Schematic  Diagram     Sensor/Motor Section ············ 35
6-10. Printed  Wiring Board     Audio Board ························ 36
6-11. Schematic  Diagram      Audio Board ·························· 37
6-12. Printed  Wiring Board     Leaf SW Board ··················· 38
6-13. Schematic  Diagram     Leaf SW Board ······················ 38
6-14. Printed  Wiring Board     Main Board ························· 39
6-15. Schematic  Diagram     Main Board (1/2) ··················· 40
6-16. Schematic  Diagram     Main Board (2/2) ··················· 41
6-17. Printed  Wiring Board     Panel Board ························· 42
6-18. Schematic  Diagram     Panel Board ···························· 43
6-19. Printed  Wiring Board     Sub Panel Board ·················· 44
6-20. Schematic  Diagram     Sub Panel Board ···················· 45
6-21. Waveforms ··································································· 46
6-22. Printed  Wiring Board     Mic Board ··························· 46
6-23. Schematic  Diagram     Mic Board ······························ 47
6-24. Printed  Wiring Board     Front AMP Board ················ 48
6-25. Schematic  Diagram     Front AMP Board ·················· 49
6-26. Printed  Wiring Board     Surround AMP Board ········· 50
6-27. Schematic  Diagram     Surround AMP Board ············ 51
6-28. Printed  Wiring Boards     Trans Board ······················· 52
6-29. Schematic  Diagram     Trans Board ···························· 53
6-30. IC Block Diagrams ······················································ 54
6-31. IC Pin Function Description ········································ 56

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1.

Check the area of your repair for unsoldered or poorly-soldered
connections.  Check the entire board surface for solder splashes
and bridges.

2.

Check the interboard wiring to ensure that no wires are
"pinched" or contact high-wattage resistors.

3.

Look for unauthorized replacement parts, particularly
transistors, that were installed during a previous repair.  Point
them out to the customer and recommend their replacement.

4.

Look for parts which, through functioning, show obvious signs
of deterioration.  Point them out to the customer and
recommend their replacement.

After correcting the original service problem, perform the following safety
checks before releasing the set to the customer.

5.

Check the B+ voltage to see it is at the values specified.

6.

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.