HCD-GX25, HCD-RG220, MHC-GX25, MHC-RG220 - Sony Audio Service Manual (repair manual). Page 4

4

Main Unit ................................................................................ 5
Remote Control ....................................................................... 6

2-1.   Case (Top) ........................................................................... 9
2-2.   CD Door .............................................................................. 9
2-3.   CD Mechanism Block ....................................................... 10
2-4.   Front Panel Section ........................................................... 11
2-5.   Tape Mechanism Deck ...................................................... 12
2-6.   Panel Board, 1 Stream Led Board, Remote Board ............ 12
2-7.   Game Jack Board, H/P Jack Board ................................... 13
2-8.   Back Panel Section ............................................................ 13
2-9.   Main Board ....................................................................... 14
2-10. Power Amp Board ............................................................. 14
2-11. SW Board, Driver Board ................................................... 15
2-12. Base Unit ........................................................................... 15
2-13. Sensor Board ..................................................................... 16
2-14. Motor (TB) Board ............................................................. 17
2-15. Motor (LD) Board ............................................................. 17
2-16. BD Board .......................................................................... 18

..................................................................... 19

................................. 22

5-1.   IC Pin Descriptions ........................................................... 23
5-2.   Block Diagram –CD Section– ........................................... 27
5-3.   Block Diagram –Tuner/Tape/Panel Section– .................... 28
5-4.   Block Diagram –Amp/Power Supply Section– ................. 29
5-5.   Note for Printed Wiring Boards

     and Schematic Diagrams .................................................. 30

5-6.   Waveforms ......................................................................... 30
5-7.   Circuit Boards Location .................................................... 30
5-8.   Printed Wiring Board –CD Mechanism Section (1/2)

    (HCD-GX25/RG220: Except AEP, UK, Russia Model)– . 31

5-9.   Printed Wiring Board –CD Mechanism Section (1/2)

    (HCD-RG220: AEP, UK, Russia Model)– ........................ 32

5-10. Schematic Diagram –CD Mechanism Section (1/2)– ....... 33
5-11. Printed Wiring Boards –CD Mechanism Section (2/2)– ... 34
5-12. Schematic Diagram –CD Mechanism Section (2/2)– ....... 35
5-13. Schematic Diagram –Main Section (1/4)– ........................ 36
5-14. Schematic Diagram –Main Section (2/4)– ........................ 37
5-15. Schematic Diagram –Main Section (3/4)– ........................ 38
5-16. Schematic Diagram –Main Section (4/4)– ........................ 39
5-17. Printed Wiring Board –Main Section– .............................. 40
5-18. Printed Wiring Boards and Schematic Diagram

    –Jack Section– ................................................................... 41

5-19. Printed Wiring Boards –Panel Section– ............................ 42
5-20. Schematic Diagram –Panel Section– ................................ 43
5-21. Schematic Diagram –Power Amp Section (1/2)– ............. 44
5-22. Schematic Diagram –Power Amp Section (2/2)– ............. 45
5-23. Printed Wiring Board –Power Amp Section

    (HCD-GX25/RG220:
    Except AEP, UK, Russia, EA Model)– ............................. 46

5-24. Printed Wiring Board –Power Amp Section

    (HCD-RG220: AEP, UK, Russia Model)– ........................ 47

5-25. Printed Wiring Board –Power Amp Section

    (HCD-RG220: EA Model)– .............................................. 48

5-26. Printed Wiring Board –Transformer Section

    (HCD-GX25/RG220:
    Except AEP, UK, Russia, EA Model)– ............................. 49

5-27. Printed Wiring Board –Transformer Section

    (HCD-RG220: AEP, UK, Russia Model)– ........................ 50

5-28. Printed Wiring Board –Transformer Section

    (HCD-RG220: EA Model)– .............................................. 51

5-29. Schematic Diagram –Transformer Section

    (HCD-GX25/RG220: Except EA Model)– ....................... 52

5-30. Schematic Diagram –Transformer Section

    (HCD-RG220: EA Model)– .............................................. 53

5-31. IC Block Diagrams ............................................................ 54

6-1.   Main Section ..................................................................... 56
6-2.   Front Panel Section (1) ...................................................... 57
6-3.   Front Panel Section (2) ...................................................... 58
6-4.   Front Panel Section (3) ...................................................... 59
6-5.   Main Board Section .......................................................... 60
6-6.   CD Mechanism Deck Section (1) ..................................... 61
6-7.   CD Mechanism Deck Section (2) ..................................... 62
6-8.   Base Unit Section .............................................................. 63

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