CDX-656, CDX-656X - Sony Car Audio Service Manual (repair manual). Page 3

3

• Keep the temperature of the soldering iron around 270 ˚C dur-

ing 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.

• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-

aged by heat.

CAUTION

Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation exposure.

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2

...................................................................

4

Installation .......................................................................

5

Connections .....................................................................

5

2-1. Disassembly Flow ...........................................................

6

2-2. Case (Upper. T), Front Panel Assy .................................

6

2-3. Mechanism Deck (MG-251B-137) .................................

6

2-4. JACK Board ....................................................................

7

2-5. MAIN Board, Slide Variable Resistor

(Elevator Height Sensor) (RV202) .................................

7

2-6. ELJ Motor Assy (Elevator) (M104) ................................

8

2-7. Escutcheon (T) ................................................................

8

2-8. Chassis (U.S) Sub Assy ..................................................

9

2-9. Chassis Assy ....................................................................

9

2-10. RF Board ......................................................................... 10
2-11. Sled Motor Assy (251) (M101),

Optical Pick-up (KSS-720A or KSS-721A) ................... 10

2-12. LSW Board, Spindle Motor (S) Sub Assy (M102) ........ 11
2-13. ELJ Motor Assy (Chucking) (M103) ............................. 11

3-1. Assembly Flow ................................................................ 12
3-2. Optical Pick-up Complete Assy ...................................... 12
3-3. Gear (Lomini)/(Load 1) Assy ......................................... 13
3-4. Operation Check ............................................................. 13

.......................... 14

.......................................... 15

6-1. Block Diagram  – SERVO Section – .............................. 17
6-2. Block Diagram  – BUS CONTROL/

POWER SUPPLY Section – ........................................... 18

6-3. Note for Printed Wiring Boards and

Schematic Diagrams ....................................................... 19

6-4. Printed Wiring Boards  – RF/LSW Boards – ................. 20
6-5. Schematic Diagram  – RF/LSW Boards – ...................... 21
6-6. Printed Wiring Boards

– MAIN Board (Component Side) – .............................. 22

6-7. Printed Wiring Boards

– MAIN (Conductor Side)/SWITCH Boards – .............. 23

6-8. Schematic Diagram  – MAIN Board (1/2) – .................. 24
6-9. Schematic Diagram

– MAIN (2/2)/SWITCH Boards – .................................. 25

6-10. Printed Wiring Boards  – JACK Board – ........................ 26
6-11. Schematic Diagram – JACK Board – ............................. 26
6-12. IC Pin Function Description ........................................... 30

7-1. Case Section .................................................................... 33
7-2. Mechanism Deck Section-1 (MG-251B-137) ................ 34
7-3. Mechanism Deck Section-2 (MG-251B-137) ................ 35
7-4. Mechanism Deck Section-3 (MG-251B-137) ................ 36
7-5. Mechanism Deck Section-4 (MG-251B-137) ................ 37

............................... 38

This set can playback a CD-R, CD-RW for audio use. When test
this set, use the following test disc.
Test disc for CD-R: TCD-R082LMT (Part No.: J-2501-063-1)
Test disc for CD-RW: TCD-W082L (Part No.: J-2501-063-2)

• You can play CD-Rs/CD-RWs (recordable CDs/

H

• Some CD-Rs/CD-RWs (depending on the equipment

• You cannot play a CD-R/CD-RW that is not finalized*.

* A process necessary for a recorded CD-R/CD-RW disc to be

H

In this set, OPTICAL PICK-UP has been changed in the midway
of production. Perform the repairing after confirming the type by
discrimination without fail.
Also, the SCREW to install the LEAF SPRING (FEED) has been
changed simultaneously. Use the SCREW that suits each OPTICL
PICK-UP.

OPTICAL
PICK-UP

SCREW that
installs LEAF
SPRING (FEED)

Part No. 8-820-165-06

Part No. 3-909-607-01

Part No. 8-820-103-11

Part No. 7-627-553-37