HCD-C20, HCD-G202, MHC-C20, MHC-G202 - Sony Audio Service Manual (repair manual). Page 3

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.......................................................................... 4

2-1. CD Door ............................................................................... 5
2-2. CD Mechanism Deck ............................................................ 5
2-3. Front Panel and Main Board ................................................. 6
2-4. Main Board and Tuner Board ............................................... 6
2-5. CD Tray ................................................................................ 7
2-6. CD Decoder Board ................................................................ 7
2-7. Base Unit .............................................................................. 8

................................ 9

................................. 9

5-1. Circuit Boards Location ...................................................... 14
5-2. Block Diagrams

• Tuner Section

(US, CND, E, SP, MY, MX, AUS models) ...................... 15

• Tuner Section (AEP, UK models) .................................... 17
• CD Section ....................................................................... 19
• Deck Section .................................................................... 21
• Main Section

(US, CND, E, SP, MY, MX, AUS models) ...................... 23

• Main Section (AEP, UK models) ..................................... 25
• Power Section

(US, CND, E, SP, MY, MX, AUS models) ...................... 27

• Power Section (AEP, UK models) ................................... 28

5-3. IC Block Diagrams .............................................................. 29
5-4. Printed Wiring Board —Main Section —

(US, CND, E, SP, MY, MX, AUS models) ......................... 34

5-5. Schematic Diagram — Main Section —

(US, CND, E, SP, MY, MX, AUS models) ......................... 39

5-6. Schematic Diagram — Main Section —

(AEP, UK models) .............................................................. 43

5-7. Printed Wiring Board —Main Section —

(AEP, UK models) .............................................................. 47

5-8. Printed Wiring Board — CD Section — ............................. 52
5-9. Schematic Diagram — CD Section — ............................... 57
5-10. Schematic Diagram — Panel Section — ......................... 61
5-11. Printed Wiring Board — Panel Section — ....................... 65
5-12. Printed Wiring Board — Tuner Section —

(US, CND, E, SP, MY, MX, AUS models) ....................... 71

5-13. Schematic Diagram — Tuner Section —

(US, CND, E, SP, MY, MX, AUS models) ....................... 75

5-14. Schematic Diagram — Tuner Section —

(AEP, UK models) ............................................................ 79

5-15. Printed Wiring Board — Tuner Section —

(AEP, UK models) ............................................................ 83

5-16. IC Pin Function ................................................................ 87

6-1. Top and Bottom Cabinet Section ........................................ 89
6-2. Front Panel Section ............................................................. 90
6-3. Cassette Mechanism Deck Section 1 .................................. 91
6-4. Cassette Mechanism Deck Section 2 .................................. 92
6-5. CD Mechanism Deck Section 1 .......................................... 93
6-6. CD Mechanism Deck Section 2 .......................................... 94
6-7. Base Unit Section (KSM-213BCM) ................................... 95

........................................ 96

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.

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.

AEP model

(Without voltage selector)

Singapore, Malaysia model

(With voltage selector)

UK model

US, Canadian model

Australian model

For detailed German, East European, CIS
model, refer to AEP model.

E, Mexican model

• Abbreviation

CND : Canadian model
MX : Mexican model
SP

: Singapore model

MY : Malaysia model
AUS : Australian model