SCD-XB780 — Sony Audio Service Manual (repair manual)

Model
SCD-XB780
Pages
84
Size
6.17 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
scd-xb780.pdf
Date

View Sony SCD-XB780 Service Manual online

SERVICE MANUAL
SUPER AUDIO CD PLAYER
AEP Model
UK Model
Korean Model
SCD-XB780
Ver 1.4  2010.12
SPECIFICATIONS
Model Name Using Similar Mechanism
NEW
CD Mechanism Type
CDM66B-DVBU6B
Base Unit Name
DVBU-6B
Optical Pick-up Name
KHM-234AMA
9-873-930-05
2010L05-1
Sony Corporation
C
 2010.12
Published by Sony Techno Create Corporation
 
2
SCD-XB780
This appliance is classified as a CLASS 1
LASER product.
This label is located on the rear exterior.
The following caution label is located
inside the unit.
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.
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.
TABLE  OF  CONTENTS
1.
SERVICING  NOTES
...............................................
3
2.
GENERAL
...................................................................
6
3.
DISASSEMBLY
3-1. Disassembly Flow ...........................................................
8
3-2. Case .................................................................................
9
3-3. Front Panel Section .........................................................
9
3-4. AUDIO Board, MAIN Board .......................................... 10
3-5. Mechanism Deck (CDM66B-DVBU6B) ....................... 10
3-6. Base Unit (DVBU-6B) .................................................... 11
4.
TEST  MODE
.............................................................. 12
5.
DIAGRAMS
5-1. Block Diagram  – RF/SERVO Section – ........................ 20
5-2. Block Diagram  – SERVO Section – .............................. 21
5-3. Block Diagram  – MAIN Section – ................................ 22
5-4. Block Diagram  – AUDIO Section – .............................. 23
5-5. Block Diagram  – DISPLAY/KEY CONTROL/
POWER SUPPLY Section – ........................................... 24
5-6. Notes for Printed Wiring Boards and
Schematic Diagrams ....................................................... 25
5-7. Schematic Diagram  – RF Board – ................................. 26
5-8. Printed Wiring Boards
– RF/LOADING Boards – .............................................. 27
5-9. Printed Wiring Board
– MAIN Board (Component Side) – .............................. 28
5-10. Printed Wiring Board
– MAIN Board (Conductor Side) – ................................ 29
5-11. Schematic Diagram
– MAIN (1/5)/ LOADING Boards  – ............................. 30
5-12. Schematic Diagram  – MAIN Board (2/5) – .................. 31
5-13. Schematic Diagram  – MAIN Board (3/5) – .................. 32
5-14. Schematic Diagram  – MAIN Board (4/5) – .................. 33
5-15. Schematic Diagram  – MAIN Board (5/5) – .................. 34
5-16. Schematic Diagram  – AUDIO/HP Boards – ................. 35
5-17. Printed Wiring Board
– AUDIO Board (Component Side) – ............................ 36
5-18. Printed Wiring Boards
 – AUDIO (Conductor Side)/HP Boards – ..................... 37
5-19. Printed Wiring Boards  – DISPLAY/KEY Boards – ...... 38
5-20. Schematic Diagram  – DISPLAY/KEY Boards – .......... 39
5-21. Printed Wiring Boards
– POWER/POWER SW/PT Boards – ............................ 40
5-22. Schematic Diagram
– POWER/POWER SW/PT Boards – ............................ 41
5-23. IC Pin Function Description ........................................... 49
6.
EXPLODED  VIEWS
6-1. Case Section .................................................................... 61
6-2. Front Panel Section ......................................................... 62
6-3. Chassis Section ............................................................... 63
6-4. Mechanism Deck Section (CDM66B-DVBU6B) .......... 64
6-5. Base Unit Section (DVBU-6B) ....................................... 65
7.
ELECTRICAL  PARTS  LIST
............................... 66
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation exposure.
3
SCD-XB780
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.
CLEANING OF OPTICAL PICK-UP LENS
In cleaning the lens of optical pick-up, use the air blower.
Never use a cotton swab for cleaning the lens of optical pick-up,
which otherwise causes a trouble.
NOTES  ON  HANDLING  THE  OPTICAL  PICK-UP
BLOCK  OR  BASE  UNIT
HOW  TO  OPEN  THE  TRAY  WHEN  POWER  SWITCH  TURNS  OFF
tray
tapering driver
cam (66)
1
Insert a tapering driver (3 mm in diameter) 
in the hole at the bottom of the unit,
turn the cam (66) fully in the direction of arrow 
A
.
A
SECTION  1
SERVICING  NOTES
4
SCD-XB780
DISPLAY  BOARD  SERVICE  POSITION
In checking the DISPLAY board, prepare jig (extension cable J-2501-200-A : 1.00 mm Pitch, 11 cores, Length 300 mm.)
MAIN board
DISPLAY board
CN801
Connect jig (extension cable J-2501-200-A)
to the DISPLAY board (CN801) and 
MAIN board (CN706).
CN706
Note:
 Follow the assembly procedure in the numerical order given.
INSTALLATION  OF  THE  TRANS BOARD
3
four screws
(PTTWH3
 
×
 
6)
2
power transformer
(T902)
4
3
four screws
(PTTWH3
 
×
 
6)
1
power transformer
(T901)
5
Solder  seventeen portions.
Note : Solder the TRANS board after installing power transformers (T901, T902)
to the chassis.
(To prevent the TRANS board from being cracked.)
5
SCD-XB780
RESETTING  OPERATION  AT  POWER  ON
If the power is turned on with a disc loaded in the set, a sequence of operation as shown below will be performed.
(The operation varies depending on the type of disc)    Condition: continue mode
(1) CD
 1.
Sled reverse move (sled in)
 2.
Disc detect
 3.
IC setting for CD
 4.
Servo error signal offset auto adjustment
 5.
Spindle kick for LD on
 6.
LD on
 7.
Focus search
 8.
Focus servo on
 9.
Spindle kick
 10. Spindle servo on
 11. E-F balance auto adjustment
 12. Tracking & sled servo on
 13. Focus bias auto adjustment
 14. Focus servo gain auto adjustment
 15. Tracking servo gain auto adjustment
 16. Jump to lead-in area
 17. Read TOC
 18. Stop
(2) SACD (single layer)
 1.
Sled reverse move (sled in)
 2.
Disc detect
 3.
IC setting for SACD
 4.
Servo error signal offset auto adjustment
 5.
Spindle kick for LD on
 6.
LD on
 7.
Focus search
 8.
Focus servo on
 9.
Spindle kick
 10. Spindle servo on
 11. E-F balance auto adjustment
 12. Tracking & sled servo on
 13. Focus bias auto adjustment
 14. Focus servo gain auto adjustment
 15. Tracking servo gain auto adjustment
 16. Jump to lead-in area
 17. Read TOC
 18. Stop
(3) SACD (dual layer)
 1.
Sled reverse move (sled in)
 2.
Disc detect
 3.
IC setting for SACD
 4.
Servo error signal offset auto adjustment
 5.
Spindle kick for LD on
 6.
LD on
 7.
Focus search
 8.
Focus servo on (layer 0)
 9.
Spindle kick
 10. Spindle servo on
 11. E-F balance auto adjustment (layer 0)
 12. Tracking & sled servo on (layer 0)
 13. Focus bias auto adjustment (layer 0)
 14. Focus servo gain auto adjustment (layer 0)
 15. Tracking servo gain auto adjustment (layer 0)
 16. Jump to lead-in area
 17. Read TOC
 18. Focus jump (layer 0
tlayer 1)
 19. E-F balance auto adjustment (layer 1)
 20. Tracking & sled servo on (layer 1)
 21. Focus bias auto adjustment (layer 1)
 22. Focus servo gain auto adjustment (layer 1)
 23. Tracking servo gain auto adjustment (layer 1)
 24. Focus Jump (layer 1
tlayer 0)
 25. Stop

Download Sony SCD-XB780 Service Manual (Repair Manual)

Here you can view online or download Sony SCD-XB780 Service Manual in pdf. This Service Manual can help you recover, restore, fix, disassemble and repair Sony SCD-XB780 Audio. Information contained in Sony SCD-XB780 service manual (repair manual) typically includes:

  • Disassembly, troubleshooting, programming, maintenance, remote, adjustment, installation and setup instructions.
  • Schematics, wiring and block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Parts list (bill of materials).