MEX-V50DT - Sony Car Audio Service Manual (repair manual). Page 2

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.

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 

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.

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.

NOTE  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 tha optical 
pick-up block. Therefore, when checking the laser diode emission, 
observe from more than 30 cm away from the objective lens.

NOTE  FOR  THE  28-PIN  CONNECTOR
Do not use alcohol to clean the 28-pin connector connecting the 
front panel with the main body.
Do not touch the connector directly with your bare hand. Poor con-
tact may be caused.

ABOUT  THE  REPAIRING  OF  BOARD
When electric parts installed by this unit are defective, replace the 
complete mouted board. Individual electrical parts that the mount 
is done cannot be exchanged.

NOTE  FOR  TRANSPORTATION 
When this unit is transported, it is necessary to install two transpor-
tation screws. Please transport it after installing two transportation 
screws as shown in the fi gure below.

Part No. 

Description

A-1844-216-A  SCREW WITH WARNING LABEL

ATENCAO!!!

Warning label

u1

Transportation screw

u2

ATENCAO!!!

Manufactured under license 
from Dolby Laboratories.
Dolby and the double-D symbol 

are trademarks of Dolby Laboratories.

Windows Media is either a registered trademark or 
trademark of Microsoft Corporation in the United 
States and/or other countries.

This product contains technology subject to certain 
intellectual property rights of Microsoft. Use or 
distribution of this technology outside of this 
product is prohibited without the appropriate 
license(s) from Microsoft.

US and foreign patents licensed from Dolby 
Laboratories.

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

“DVD VIDEO,” “DVD-R,” “DVD-RW,” “DVD+R,” 
and “DVD+RW” are trademarks.

This product uses font data which is licensed to 
Sony by Monotype Imaging Inc. or its affiliates.

THIS PRODUCT IS LICENSED UNDER THE 
MPEG-4 VISUAL PATENT PORTFOLIO 
LICENSE FOR THE PERSONAL AND NON-
COMMERCIAL USE OF A CONSUMER FOR 
DECODING MPEG-4 VIDEO THAT WAS 
ENCODED BY A CONSUMER ENGAGED IN A 
PERSONAL AND NON-COMMERCIAL 
ACTIVITY AND/OR WAS OBTAINED FROM A 
VIDEO PROVIDER LICENSED BY MPEG LA 
TO PROVIDE MPEG-4 VIDEO. NO LICENSE IS 
GRANTED OR SHALL BE IMPLIED FOR ANY 
OTHER USE. ADDITIONAL INFORMATION 
INCLUDING THAT RELATING TO 
PROMOTIONAL, INTERNAL AND 
COMMERCIAL USES AND LICENSING MAY 
BE OBTAINED FROM MPEG LA, LLC. SEE 
HTTP://WWW.MPEGLA.COM

All other trademarks are trademarks of their 
respective owners.

This label is located on the drive unit’s internal 
chassis.