Sony SCD-XB940 Manuale utente

SERVICE MANUAL

SUPER AUDIO CD PLAYER

AEP Model

UK Model

SPECIFICATIONS

SCD-XB940

Model Name Using Similar Mechanism NEW

CD Mechanism Type CDM55B-DVBU3

Base Unit Name DVBU3

Optical Pick-up Name KHM-220AAA/J1N

– Continued on next page –

Photo: Black type

Ver 1.1 2002.05

9-929-212-12 Sony Corporation

2002E0500-1 Home Audio Company

C2002.05 Published by Sony Engineering Corporation

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK 0OR DOTTED

LINE WITH MARK 0ON 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.

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.

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.

CAUTION

Use of controls or adjustments or performance of procedures

other than those specified herein may result in hazardous ra-

diation exposure.

TABLE OF CONTENTS

1. SERVICING NOTES ............................................... 4

2. GENERAL ................................................................... 5

3. DISASSEMBLY ......................................................... 8

4. DIAGRAMS

4-1. Notes for Printed Wiring Board and

Schematic Diagram ......................................................... 11

4-2. Printed Wiring Board – TK Board –.............................. 12

4-3. Schematic Diagram – TK Board – ................................ 13

4-4. Printed Wiring Board

– MAIN Board (Component Side) – .............................. 14

4-5. Printed Wiring Board

– MAIN Board (Conductor Side) – ................................ 15

4-6. Schematic Diagram – MAIN Board (1/6) – .................. 16

4-7. Schematic Diagram – MAIN Board (2/6) – .................. 17

4-8. Schematic Diagram – MAIN Board (3/6) – .................. 18

4-9. Schematic Diagram – MAIN Board (4/6) – .................. 19

4-10. Schematic Diagram – MAIN Board (5/6) – .................. 20

4-11. Schematic Diagram – MAIN Board (6/6) – .................. 21

4-12. Printed Wiring Board – AUDIO Board – ...................... 22

4-13. Schematic Diagram – AUDIO Board – ......................... 23

4-14. Printed Wiring Board – HP Board – .............................. 24

4-15. Schematic Diagram – HP Board –................................. 24

4-16. Printed Wiring Board – LOADING Board –................. 25

4-17. Schematic Diagram – LOADING Board – ................... 25

4-18. Printed Wiring Board – DISPLAY Board – .................. 26

4-19. Schematic Diagram – DISPLAY Board – ..................... 27

4-20. Printed Wiring Board – POWER Board – ..................... 28

4-21. Schematic Diagram – POWER Board –........................ 29

4-22. Printed Wiring Boards

– AC SW/TRANSFORMER Boards – ........................... 30

4-23. Schematic Diagram

– AC SW/TRANSFORMER Boards – ........................... 31

5. EXPLODED VIEWS................................................ 36

6. ELECTRICAL PARTS LIST ............................... 40

The laser diode in the optical pick-up block may suffer electro-

static 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.

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.

MODEL IDENTIFICATION

– Back Panel –

SECTION 1

SERVICING NOTES

NOTES ON HANDLING THE OPTICAL PICK-UP

BLOCK OR BASE UNIT

Part No.

HOW TO OPEN THE TRAY WHEN POWER SWITCH

TURNS OFF

There are two different methods to open the tray.

• Method-1

Insert a screw driver (3) into the aperture of the unit bottom, and

turn it in the direction of the arrow (to OUT direction).

tray

screw driver (3)

*To close the disc table, turn the screw driver (3)

in the reverse direction

(

to IN direction

)

Model Part No.

AEP 4-227-711-0

UK 4-227-711-1

tray

cam (CDM55)

screw driver (3)

• Method-2

1Insert a screw driver (3) into the aperture of the unit bottom,

and move the cam (CDM55) in the direction of arrow A.

2Pull the tray in the direction of arrow B.

ABOUT THE “E01” DISPLAY

“E01” is displayed when the above occurs in communication with

a system controller (IC605) and a display controller (IC203) at the

time of starting.

In this case, please check soldering, disconnection, etc. of each

IC.

Ver 1.1

SECTION 2

GENERAL This section is extracted from

instruction manual.

4connector

(CN992)

4connector

(CN351)

7two claws

2loading panel ass’y

qd front panel section

9knob (AMS)

6seven screws

(BV/RING)

qa connector

(CN201)

qs DISPLAY board

q; eight screws

(BVTP2.6 ×8)

7two claws

3wire (flat type) (10 core

)

(CN601)

5holder

1Pull out the tray.

(Refer to page 4, “HOWTO OPEN THE

TRAY WHEN POWER SWITCH TRANS OFF”.)

q; five screws

(BVTP2.6 ×8)

COVER (4095269)

FRONT PANEL SECTION

Note: Follow the disassembly procedure in the numerical order given.

SECTION 3

DISASSEMBLY

1two screws

3cover (4095269

)

AUDIO/MAIN BOARD

MECHANISM DECK (CDM55B-DVBU3)

6three connectors

(CN301, 304, 351)

2two wires (flat type) (18 core)

(CN602, 603)

3two connectors

(CN605, 610)

4five screws

(BVTT3 ×8)

5MAIN board

9two PC board holders

7three screws

(BV/RING)

2wire (flat type) (10 core)

(CN601)

2two wires (flat type) (16 core)

(CN608, 611)

q; AUDIO board

8screw

(BVTT3 ×8)

1Pull out the tray.

(Refer to page 4, “HOW TO OPEN THE

TRAY WHEN POWER SWITCH TRANS OFF”.)

5screw

(BVTT3 ×8)

6mechanism deck

(CDM55B-DVBU3)

4connector

(CN605)

3two wires (flat type) (18 core)

(CN602, 603)

2loading panel ass’y

1Pull out the tray.

(Refer to page 4, “HOW TO OPEN THE

TRAY WHEN POWER SWITCH TRANS OFF”.)

TRAY

1Remove the tray. (Careful of the claw.)

claw

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