XAV-742 - Sony Car Audio Service Manual (repair manual). Page 4

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
The laser beam on this model is concentrated so as to be focused 
on the disc refl ective surface by the objective lens in the optical 
pickup block. Therefore, when checking the laser diode emission, 
observe from more than 30 cm away from the objective lens.

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)

NOTE  THE  CN101  AND  CN901  ON  THE  MAIN  BOARD  
REPLACING
CN101 and CN901 on the MAIN board cannot exchange with 
single. When these parts are damaged, exchange the complete 
mounted board.

NOTE  FOR  REPLACEMENT  OF  THE  DISPLAY,  KEY7    
AND  MOTOR  BOARDS
When repairing, the complete DISPLAY board, complete KEY7 
board and complete MOTOR board should be replaced since any 
parts in the DISPLAY, KEY7 and MOTOR boards cannot be re-
paired.

NOTE  THE  CN7301  ON  THE  D-SUB7  BOARD  RE-
PLACING
CN7301 on the D-SUB7 board cannot exchange with single. When 
this part is damaged, exchange the complete mounted board.

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.

Signal format 

system

Region 

code

Part No.

PAL

3

4-476-498-0[]

E (PAL) model

PAL

5

4-476-499-0[]

Russian model