CDX-757MX (serv.man2) - Sony Car Audio Service Manual (repair manual). Page 3

3

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

2

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

4

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

6

2-1.

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

7

2-2.

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

8

2-3.

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

8

2-4.

JACK Board .....................................................................

9

2-5.

MAIN Board, Slide Variable Resistor
(Elevator Height Sensor) (RV202) ..................................

9

2-6.

ELJ Motor Assy (Elevator) (M104) ................................. 10

2-7.

Escutcheon (T) ................................................................ 10

2-8.

Chassis (U.S) Sub Assy ................................................... 11

2-9.

Chassis Assy .................................................................... 11

2-10. RF Board ......................................................................... 12
2-11. Sled Motor Assy (251) (M101),

Optical Pick-up (KSS-721A) ........................................... 12

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

3-1.

Assembly Flow ................................................................ 14

3-2.

Optical Pick-up Complete Assy ...................................... 14

3-3.

Gear (Lomini)/(Load CAM) Assy ................................... 15

3-4.

Operation Check .............................................................. 15

....................... 16

........................................... 17

6-1.

Block Diagram  – SERVO Section – ............................... 18

6-2.

Block Diagram  – MAIN Section (1/2) – ........................ 19

6-3.

Block Diagram  – MAIN Section (2/2) – ........................ 20

6-4.

Printed Wiring Boards  – RF/LSW Boards – .................. 22

6-5.

Schematic Diagram  – RF/LSW Boards – ....................... 23

6-6.

Printed Wiring Boards
– MAIN Board (Component Side) – ............................... 24

6-7.

Printed Wiring Boards
– MAIN (Conductor Side)/SWITCH Boards – ............... 25

6-8.

Schematic Diagram  – MAIN Board (1/3) – ................... 26

6-9.

Schematic Diagram
– MAIN (2/3)/SWITCH Boards – ................................... 27

6-10. Schematic Diagram  – MAIN Board (3/3) – ................... 28
6-11. Printed Wiring Boards  – JACK Board – ......................... 30
6-12. Schematic Diagram – JACK Board – .............................. 31

7-1.

Case Section .................................................................... 38

7-2.

Mechanism Deck Section-1 (MG-251B-137) ................. 39

7-3.

Mechanism Deck Section-2 (MG-251B-137) ................. 40

7-4.

Mechanism Deck Section-3 (MG-251B-137) ................. 41

7-5.

Mechanism Deck Section-4 (MG-251B-137) ................. 42

................................ 43

Remove the CASE (LOWER. T) beforehand

1) Press the lever (ML.S) assy in the direction of arrow A.
2) Removal the magazine assy.

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

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-2502-063-1)
Test disc for CD-RW: TCD-W082L (Part No. J-2502-063-2)

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

on this unit. (fig. H)

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

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

• A CD-R/CD-RW to which a session can be added can be

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

H