MEX-BT4700U, MEX-BT4750U - Sony Car Audio Service Manual (repair manual). Page 2

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 soldering iron around 270 °C during 
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.

0  OR  DOTTED  LINE  

0  ON  THE  SCHEMATIC  DIAGRAMS  AND  IN  

CAUTION
Use of controls or adjustments or performance of procedures 
other than those specifi ed herein may result in hazardous radia-
tion exposure.

This label is located on the bottom of the
chassis.

  .............................................   3

  ..................................................................   6

3-1.  Disassembly  Flow ..........................................................   14
3-2. Cover 

...............................................................................  14

3-3. Sub 

Panel 

Assy 

................................................................  15

3-4. CD 

Mechanism 

Block 

.....................................................  15

3-5. MAIN 

Board 

...................................................................  16

3-6. SERVO 

Board 

.................................................................  16

3-7. Chassis 

(T) 

Sub 

Assy 

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

3-8.  Roller Arm Assy ..............................................................   17
3-9. Chassis 

(Op) 

Assy 

...........................................................  18

3-10.  Chucking Arm Sub Assy .................................................   18
3-11. Sled Motor Assy 

..............................................................   19

3-12.  Optical Pick-up Block .....................................................   19
3-13. Optical Pick-up ...............................................................   19

4-1.  Block Diagram - AUDIO Section (1/2) - ........................   20
4-2.  Block Diagram - AUDIO Section (2/2) - ........................   21
4-3. Block 

Diagram 

- PANEL, POWER SUPPLY Section - ...........................   22

4-4.  Printed Wiring Boards - MAIN Section (1/2) - ..............   24
4-5.  Printed Wiring Boards - MAIN Section (2/2) - ..............   25
4-6.  Schematic Diagram - MAIN Section (1/4) - ...................   26
4-7.  Schematic Diagram - MAIN Section (2/4) - ...................   27
4-8.  Schematic Diagram - MAIN Section (3/4) - ...................   28
4-9.  Schematic Diagram - MAIN Section (4/4) - ...................   29
4-10.  Printed Wiring Boards - SUB Section - ..........................   30
4-11.  Schematic Diagram - SUB Section - ..............................   31
4-12.  Printed Wiring Boards - KEY Section - ..........................   32
4-13.  Schematic Diagram - KEY Section - ..............................   33

5-1. Main 

Section 

...................................................................  39

5-2.  Front Panel Section .........................................................   40
5-3.  CD Mechanism Deck Section (MG-101Z-188//Q) ........   41

  ..............................   42

Accessories are given in the last of the electrical parts list.

The Bluetooth word mark and logos are owned 
by the Bluetooth SIG, Inc. and any use of such 
marks by Sony Corporation is under license. 
Other trademarks and trade names are those of 
their respective owners.

ZAPPIN is a trademark of Sony Corporation.

iPod is a trademark of Apple Inc., registered in 
the U.S. and other countries.

iPhone is a trademark of Apple Inc.

Windows Media, and the 
Windows logo are trademarks 
or registered trademarks of 
Microsoft Corporation in the 

United States and/or other countries.

MPEG Layer-3 audio coding technology and 
patents licensed from Fraunhofer IIS and Thomson.

This product is protected by certain intellectual 
property rights of Microsoft Corporation. Use or 
distribution of such technology outside of this 
product is prohibited without a license from 
Microsoft or an authorized Microsoft subsidiary.

Content providers are using the digital rights 
management technology for Windows Media 
contained in this device (“WM-DRM”) to protect 
the integrity of their content (“Secure Content”) so 
that their intellectual property, including copyright, 
in such content is not misappropriated.
This device uses WM-DRM software to play 
Secure Content (“WM-DRM Software”). If the 
security of the WM-DRM Software in this device 
has been compromised, owners of Secure Content 
(“Secure Content Owners”) may request that 
Microsoft revoke the WM-DRM Software’s right 
to acquire new licenses to copy, display and/or 
play Secure Content. Revocation does not alter the 
WM-DRM Software’s ability to play unprotected 
content. A list of revoked WM-DRM Software is 
sent to your device whenever you download a 
license for Secure Content from the Internet or 
from a PC. Microsoft may, in conjunction with 
such license, also download revocation lists onto 
your device on behalf of Secure Content Owners.