DOWNLOAD Sony SCD-XB790 Service Manual ↓ Size: 5.78 MB | Pages: 78 in PDF or view online for FREE

Model
SCD-XB790
Pages
78
Size
5.78 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
scd-xb790.pdf
Date

Sony SCD-XB790 Service Manual ▷ View online

SERVICE MANUAL
SUPER AUDIO CD PLAYER
AEP Model
UK Model
SCD-XB790
Ver 1.0  2003.04
SPECIFICATIONS
Model Name Using Similar Mechanism
SCD-XB780
CD Mechanism Type
CDM66B-DVBU6B
Base Unit Name
DVBU-6B
Optical Pick-up Name
KHM-234AMA
9-877-171-01
Sony Corporation
2003D0500-1
Home Audio Company
C
 2003.04
Published by Sony Engineering Corporation
When a super audio CD is played
Playing frequency range  2 Hz to 100 kHz
Frequency response 
2 Hz to 50 kHz (–3 dB)
Dynamic range 
104 dB or more
Total harmonic distortion rate
0.0018 % or less
Wow and flutter 
Value of  measurable limit (±0.001 %
W. PEAK) or less
When a CD is played
Frequency response 
2 Hz to 20 kHz
Dynamic range 
99 dB or more
Total harmonic distortion rate
0.002 % or less
Wow and flutter 
Value of measurable limit (±0.001 %
W. PEAK) or less
Output connector
*Output only the audio signals of the CD
ANALOG OUT
DIGITAL (CD)
OUT
OPTICAL*
DIGITAL (CD)
OUT
COAXIAL*
PHONES
Jack type
Phono
jacks
Square
optical
output
connector
Coaxial
output
connector
Stereo
phone jack
Output level
2 Vrms
(at 50 kilohms)
–18 dBm
0.5 Vp-p
10 mW
Load impedance
Over 10 kilohms
Light emitting
wave length:
660 nm
75 ohms
32 ohms
(         )
General
Laser 
Semiconductor laser
(Super Audio CD: 
λ = 650 nm)
(CD: 
λ = 780 nm)
Emission duration: continuous
Laser radiant power:         5.47 uW at 650 nm
*These output is the value measured at a distance of about
  200mm from the objective lens surface on the optical pick-up.
Power requirements 
230 V AC, 50/60 Hz
Power consumption 
25 W
Dimensions (w/h/d) 
430 
× 111 × 283 mm incl. projecting
parts
Mass (approx.) 
5.8 kg
Supplied accessories
• Audio connecting cord
Stereo cable (1)
•Remote commander RM-SX700 (1)
• R06 (size-AA) batteries (2)
Design and specifications are subject to change without notice.
2
SCD-XB790
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-XB790
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-XB790
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.)
Page of 78
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  • DOWNLOAD Sony SCD-XB790 Service Manual ↓ Size: 5.78 MB | Pages: 78 in PDF or view online for FREE
  • Here you can View online or download the Service Manual for the Sony SCD-XB790 in PDF for free, which will help you to disassemble, recover, fix and repair Sony SCD-XB790 Audio. Information contained in Sony SCD-XB790 Service Manual (repair manual) includes:
  • Disassembly, troubleshooting, maintenance, adjustment, installation and setup instructions.
  • Schematics, Circuit, Wiring and Block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Exploded View and Parts List.