CDX-GT475ER, CDX-GT475UR, CDX-GT525UR - Sony Car Audio Service Manual (repair manual). Page 3

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 fl exible board is easily damaged and should be handled with 
care.

NOTES  ON  LASER  DIODE  EMISSION  CHECK
Never look into the laser diode emission from right above when 
checking it for adjustment. It is feared that you will lose your sight.

If the optical pick-up block is defective, please replace the whole 
optical pick-up block.
Never turn the semi-fi xed resistor located at the side of optical 
pick-up block.

UNLEADED  SOLDER
Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution:  Some printed circuit boards may not come printed with 

the lead free mark due to their particular size)

Unleaded solder has the following characteristics.
•  Unleaded solder melts at a temperature about 40 °C higher 

than ordinary solder.

 

Ordinary soldering irons can be used but the iron tip has to be 
applied to the solder joint for a slightly longer time.

 

Soldering irons using a temperature regulator should be set to 
about 350 °C.
Caution: The printed pattern (copper foil) may peel away if 

the heated tip is applied for too long, so be careful!

• Strong 

viscosity

 

Unleaded solder is more viscous (sticky, less prone to fl ow) 
than ordinary solder so use caution not to let solder bridges 
occur such as on IC pins, etc.

•  Usable with ordinary solder
 

It is best to use only unleaded solder but unleaded solder may 
also be added to ordinary solder.

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

 ..................................................................   7

3-1. Disassembly 

Flow 

...........................................................  11

3-2.  Mini Fuse (Blade Type) (10A/32V) (FU1), Cover .........   12
3-3.  Sub Panel Block ..............................................................   12
3-4.  CD Mechanism Deck (MG-101CA-188) .......................   13
3-5.  Connection Cable (Automobile) (

) (USB1) ..............   13

3-6. MAIN 

Board 

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

3-7. SERVO 

Board 

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

3-8.  Chassis (T) Sub Assy ......................................................   15
3-9. Roller 

Arm 

Assy 

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

3-10. Chassis (OP) Assy ...........................................................   16
3-11.  Chucking Arm Sub Assy .................................................   16
3-12. Sled Motor Assy ..............................................................   17
3-13.  Optical Pick-up Section ..................................................   18
3-14. Optical Pick-up ...............................................................   18

4-1.  Block Diagram - SERVO Section - ................................   19
4-2.  Block Diagram - MAIN Section - ...................................   20
4-3.  Block Diagram - PANEL/POWER SUPPLY Section - ...   21
4-4.  Schematic Diagram - MAIN Section (1/5) - ...................   23
4-5.  Schematic Diagram - MAIN Section (2/5) - ...................   24
4-6.  Schematic Diagram - MAIN Section (3/5) - ...................   25
4-7.  Schematic Diagram - MAIN Section (4/5) - ...................   26
4-8.  Schematic Diagram - MAIN Section (5/5) - ...................   27
4-9.  Printed Wiring Board - MAIN Section (1/2) - ................   28
4-10.  Printed Wiring Boards - MAIN Section (2/2) - ..............   29
4-11.  Printed Wiring Board - KEY Board -..............................   30
4-12.  Schematic Diagram - KEY Board - ................................   31

5-1. Main 

Section 

...................................................................  40

5-2.  Front Panel Section .........................................................   41
5-3.  CD Mechanism Deck Section (MG-101CA-188) ..........   42

 ..............................   43

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