HCD-GX255, HCD-RG170, HCD-RG470, MHC-GX255, MHC-RG170, MHC-RG470 - Sony Audio Service Manual (repair manual). Page 4

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5

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6

3-1.

Disassembly Flow ...........................................................

8

3-2.

Case (Top) .......................................................................

9

3-3.

Door (CD) ........................................................................

9

3-4.

Front Panel Section ......................................................... 10

3-5

Mechanical Deck (CWM43FF13) ................................... 10

3-6.

CD Mechanism Deck (CDM74KFS-F1BD81C
(Except MX model)/CDM74KFS-F1BD84
(MX model)) .................................................................... 11

3-7.

Back Panel Section .......................................................... 11

3-8.

MAIN Board .................................................................... 12

3-9.

BD Board/CD Board ....................................................... 12

3-10. DRIVER Board, SW Board ............................................. 13
3-11. Optical Pick-up Block (KSM-215DCP) .......................... 13
3-12. SENSOR Board ............................................................... 14
3-13. MOTOR (TB) Board ....................................................... 14
3-14. MOTOR (LD) Board ....................................................... 15

.............................................................. 16

............................ 20

6-1.

Block Diagram  – CD SERVO Section – ........................ 21

6-2.

Block Diagram  – AUDIO/VIDEO Section – ................. 22

6-3.

Block Diagram  – AMP Section – ................................... 23

6-4.

Block Diagram
– PANEL, POWER SUPPLY Section – .......................... 24

6-5.

Printed Wiring Board
– CD Board – (Except MX model) ................................. 26

6-6.

Schematic Diagram
– CD Board – (Except MX model) ................................. 27

6-7.

Printed Wiring Board  – BD Board – (MX model) ......... 28

6-8.

Schematic Diagram  – BD Board – (MX model) ............ 29

6-9.

Printed Wiring Boards  – CHANGER Section – ............. 30

6-10. Schemtic Diagram  – CHANGER Setion – ..................... 31
6-11. Printed Wiring Board  – MAIN Board – (Suffix-11) ...... 32
6-12. Schematic Diagram  – MAIN Board (1/3) –

(Suffix-11) ....................................................................... 33

6-13. Schematic Diagram  – MAIN Board (2/3) –

(Suffix-11) ....................................................................... 34

6-14. Schematic Diagram  – MAIN Board (3/3) –

(Suffix-11) ....................................................................... 35

6-15. Printed Wiring Board  – MAIN Board – (Suffix-12) ...... 36
6-16. Schematic Diagram  – MAIN Board (1/3) –

(Suffix-12) ....................................................................... 37

6-17. Schematic Diagram  – MAIN Board (2/3) –

(Suffix-12) ....................................................................... 38

6-18. Schematic Diagram  – MAIN Board (3/3) –

(Suffix-12) ....................................................................... 39

6-19. Printed Wiring Board  – POWER Board –

(GX255/RG170) .............................................................. 40

6-20. Schematic Diagram  –POWER Board –

(GX255/RG170) .............................................................. 41

6-21. Printed Wiring Board  – POWER Board –

(RG470: AEP, EE, RU) ................................................... 42

6-22. Schematic Diagram  – POWER Board –

(RG470: AEP, EE, RU) ................................................... 43

6-23. Printed Wiring Board  – POWER Board –

(RG470: E2, E51, AR, MX) ............................................ 44

6-24. Schematic Diagram  – POWER Board –

(RG470: E2, E51, AR, MX) ............................................ 45

6-25. Printed Wiring Boards

– AUDIO, MIC, HEADPHONE Boards – ...................... 46

6-26. Schematic Diagram

– AUDIO, MIC, HEADPHONE Boards – ...................... 47

6-27. Printed Wiring Boards  – CD-G Section –

(MX model only) ............................................................. 48

6-28. Schematic Diagram  – CD-G Section –

(MX model only) ............................................................. 49

6-29. Printed Wiring Board  – PANEL Section (1/2) ............... 50
6-30. Printed Wiring Board  – PANEL Section (2/2) ............... 51
6-31. Schematic Diagram  – PANEL Section (1/2) .................. 52
6-32. Schematic Diagram  – PANEL Section (2/2) .................. 53
6-33. Printed Wiring Boards  – TRANS Section –

(GX255/RG170) .............................................................. 54

6-34. Schematic Diagram  – TRANS Section –

(GX255/RG170) .............................................................. 55

6-35. Printed Wiring Boards  – TRANS Section –

(RG470: AEP, EE, RU) ................................................... 56

6-36. Schematic Diagram  – TRANS Section –

(RG470: AEP, EE, RU) ................................................... 57

6-37. Printed Wiring Boards  – TRANS Section –

(RG470: E2, E51, AR, MX) ............................................ 58

6-38. Schematic Diagram  – TRANS Section –

(RG470: E2, E51, AR, MX) ............................................ 59

7-1.

Overall Section ................................................................ 77

7-2.

Back Panel Section .......................................................... 78

7-3.

Front Panel Section ......................................................... 79

7-4.

Key Section ..................................................................... 80

7-5.

Chassis Section ................................................................ 81

7-6.

Transformer Section ........................................................ 82

7-7.

CD Mechanism Deck Section-1
(CDM74KFS-F1BD81C (Except MX model)/
CDM74KFS-F1BD84 (MX model)) ............................... 83

7-8.

CD Mechanism Deck Section-2
(CDM74KFS-F1BD81C (Except MX model)/
CDM74KFS-F1BD84 (MX model)) ............................... 84

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•

Abbreviation
AR : Argentina model
E2 : 120V AC Area in E model
E51 : Chilean and Peruvian model
EE : East European model
MX : Mexican model
RU : Russian model