DAV-HDX678WF, DAV-HDX975WF, HCD-HDX678WF, HCD-HDX975WF - Sony Audio Service Manual (repair manual). Page 5

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.

The laser diode in the optical pick-up block may suffer electrostat-
ic 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.

RELEASING  THE  TRAY  LOCK
The disc tray lock function for the antitheft of an demonstration 
disc in the store is equipped.

Releasing Procedure:
1.  Press the [

?/1

] button to turn on the system.

2.  Press the [FUNCTION] button repeatedly to select “DVD”.
3.  While pressing the [

s

] button, press the [

A

] button until “UN-

LOCKED” displayed on the fl uorescent indicator tube (around 
5 seconds).

Note:  When “LOCKED” is displayed, the tray lock is not released by 

turning power on/off with the [?/1] button.

RELEASING  THE  DEMO  PLAY  LOCK
Releasing Procedure:
1.  Press the [

?/1

] button to turn on the system.

2.  Press the [FUNCTION] button repeatedly to select “DVD”.
3.  While pressing the [

s

] button, press the [

H

] button until 

“DEMO OFF” displayed on the fl uorescent indicator tube 
(around 5 seconds).

Note:  When “DEMO ON” is displayed, the set is not possible to turn off 

the system.

NOTE  OF  REPLACING  THE  IC1103  ON  THE  MAIN  
BOARD
IC1103 on the MAIN board cannot exchange with single. When 
IC1103 on the MAIN board is damaged, exchange the entire 
mounted board.

NOTE  OF  REPLACING  THE  C3011  AND  C3031  ON  
THE  MAIN  BOARD
C3011, C3031 and IC in the table below on the MAIN board have 
been changed at the same time by the midway of production.
Replace a part referring to how to distinguish the fi gure  below 
when you exchange C3011 or C3031.

Note:  Service parts of pertinent IC are only CDX9883M.

IC3100, IC3150, 
IC3300, IC3400, IC3500

C3011, C3031

Former type

CXD9883M

1-216-947-11
ELECT
47uF  20%  35V

New type

CXD9883AM

1-165-726-31
ELECT
56uF  20%  16V