Table Of Contents - Sony CDX-656 Service Manual

CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation exposure.
Flexible Circuit Board Repairing
• 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.
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
TEST DISC
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)
Notes on CD-R/CD-RW discs
• You can play CD-Rs/CD-RWs (recordable CDs/
rewritable CDs) designed for audio use on this unit
(fig. ).
H
• Some CD-Rs/CD-RWs (depending on the equipment
used for its recording or the condition of the disc) may
not play on this unit.
• 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
played on the audio CD player.
Look for this mark to distinguish CD-Rs/CD-RWs for audio use.
H
This mark denotes that a disc is not for audio use.
DISCRIMINATION OF OPTICAL PICK-UP
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.
KSS-720A
OPTICAL
PICK-UP
Part No. 8-820-103-11
SCREW that
installs LEAF
Part No. 7-627-553-37
SPRING (FEED)
SERVICING NOTES
1.
2.
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
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),
2-12. LSW Board, Spindle Motor (S) Sub Assy (M102) ........ 11
2-13. ELJ Motor Assy (Chucking) (M103) ............................. 11
3.
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
4.
5.
6.
6-1. Block Diagram - SERVO Section - .............................. 17
6-2. Block Diagram - BUS CONTROL/
6-3. Note for Printed Wiring Boards and
6-4. Printed Wiring Boards - RF/LSW Boards - ................. 20
6-5. Schematic Diagram - RF/LSW Boards - ...................... 21
6-6. Printed Wiring Boards
6-7. Printed Wiring Boards
6-8. Schematic Diagram - MAIN Board (1/2) - .................. 24
6-9. Schematic Diagram
6-10. Printed Wiring Boards - JACK Board - ........................ 26
KSS-721A
6-11. Schematic Diagram - JACK Board - ............................. 26
6-12. IC Pin Function Description ........................................... 30
7.
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
8.
Part No. 8-820-165-06
Part No. 3-909-607-01

TABLE OF CONTENTS

.......................................................... 2
GENERAL
................................................................... 4
Installation ....................................................................... 5
Connections ..................................................................... 5
DISASSEMBLY
(Elevator Height Sensor) (RV202) ................................. 7
Optical Pick-up (KSS-720A or KSS-721A) ................... 10
ASSEMBLY
MECHANICAL ADJUSTMENT
ELECTRICAL CHECK
.......................................... 15
DIAGRAMS
POWER SUPPLY Section - ........................................... 18
Schematic Diagrams ....................................................... 19
- MAIN Board (Component Side) - .............................. 22
- MAIN (Conductor Side)/SWITCH Boards - .............. 23
- MAIN (2/2)/SWITCH Boards - .................................. 25
EXPLODED VIEWS
ELECTRICAL PARTS LIST
CDX-656/656X
Ver. 1.1
.......................... 14
............................... 38
3