This is the 42 pages manual for sony cdx 656 service manual. Read or download the pdf for free.
If you want to contribute, please mail your pdfs to info@audioservicemanuals.com.
Page: 1 / 42
Extracted text from sony cdx 656 service manual (Ocr-read)
Page 1
2
CDX-656/656X
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED
LINE WITH MARK 0 ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BY SONY.
ATTENTION AU COMPOSANT AYANT RAPPORT
Ã- LA SÉCURITÉ!
LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE 0
SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE
DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ
DE FONCTIONNEMENT. NE REMPLACER CES COM-
POSANTS QUE PAR DES PIÈCES SONY DONT LES
NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.
AEP/UK model:
When replacing the chassis (U.S) sub assy of mechanism deck
which have the CAUTION LABEL attached, please be sure to
put a new CAUTION LABEL (3-223-913-11) to the chassis (U.S)
sub assy.Flexible Circuit Board Repairing
- Keep the temperature of the soldering iron around 270 ËšC 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. CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation exposure.
SERVICING NOTES
NOTES ON HANDLING THE OPTICAL PICK-
UP BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer electro-
static breakdown because of the potential difference generated by
the charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic breakdown 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.
NOTES ON LASER DIODE EMISSION CHECK
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 emis-
sion, observe from more than 30 cm away from the objective lens.
US/Canadian model:
If the optical pick-up block is defective, please replace the whole
optical pick-up block.
Never turn the semi-fixed resistor located at the side of optical
pick-up block.
DISC MAGAZINE GETTING OUT PROCEDURE
ON THE POWER SUPPLY IS OFF
Remove the CASE (LOWER. T) beforehand
1) Press the lever (ML.S) assy in the direction of arrow A.
2) Removal the magazine assy.
Note: Take out the magazine only when the tray is completely within the
magazine. If the disk or tray is sticking out, turn on the power and
eject the magazine.
Lever (ML.S)
Magazine assy
A
OPTICA L PICK-UP
BLOCK
SEMI-FIXED
RESISTOR
Page 2
3
CDX-656/656X
TABLE OF CONTENTS
SERVICING NOTES
.......................................................... 2
1. GENERAL ................................................................... 4
Installation ....................................................................... 5
Connections ..................................................................... 5
2. DISASSEMBLY
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) .......................................... 10
2-12. LSW Board, Spindle Motor (S) Sub Assy (M102) ........ 11
2-13. ELJ Motor Assy (Chucking) (M103) ............................. 11
3. ASSEMBLY
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. MECHANICAL ADJUSTMENT .......................... 14
5. ELECTRICAL CHECK .......................................... 15
6. DIAGRAMS
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. EXPLODED VIEWS
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. ELECTRICAL PARTS LIST ............................... 38
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.
H Look for this mark to distinguish CD-Rs/CD-RWs for audio use.
This mark denotes that a disc is not for audio use.