DSK-GTX999, HCD-GTX999 - Sony Audio Service Manual (repair manual). Page 3

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

Releasing Procedure:
1. Press 

[

?/1

] button to turn the power on.

2.  Press the [FUNCTION] button to select CD function.
3.  While pressing the [

x

] button, press the [

Z

] button for more 5 

seconds).

4.  The message “UNLOCKED” is displayed and the disc tray is 

unlocked.

Note: When 

“

LOCKED

”

 is displayed, the slot lock is not released by 

turning power on/off with the

 [

?/1

]

 button.

NOTE  THE  HANDLING  OF  HDD
1.  Note The Transported
Do not give set the high impact when you transport this set. HDD 
might be damaged by the impact.

2.  Note The Repairing
Do not move the set for state power on, and for at least 30 seconds 
after the set is power off. HDD might be damaged by the impact.

NOTE  THE  IC5  AND  IC13  ON  THE  USB  MICOM  
BOARD  REPLACING
IC5 and IC13 on the USB MICOM board cannot exchange with 
single. When these parts on the USB MICOM board are damaged, 
exchange the entire mounted board.

NOTE  THE  DISASSEMBLY  OF  USB  CONNECTOR  
BOARD
USB CONNECTOR board and HDD LED (A)/(B) board connec-
tion part are damaged easily. Note the printed pattern may peel, 
remove carefully.

NOTE  THE  IC202  ON  THE  MAIN  BOARD  
REPLACING
Excecute the following procedures immediately after the IC202 on 
the MAIN board is exchanged, and the cold reset is executed.

Procedure:
1.  Press the [

?/1

] button to turn the power on.

2.  Press the [TUNER/BAND] button to select TUNER (FM) 

function.

3.  Press the [TUNING MODE] button on the remote commander 

to preset menu displayed.

4.  Press the [M]/[m] buttons to select “FM2 88.00 MHz”.

5.  Press the [TUNER MEMORY] button on the remote com-

mander.

6.  Press the [M]/[m] buttons to select “FM9”.

7.  Press the [ENTER] button to preset memory.

Note: Do not disconnect the AC plug while this operation.

120V AC area in E model, 
Chilean and Peruvian models

3-294-738-0[]

Mexican model

3-294-738-1[]

Argentina model

3-294-738-2[]

Brazilian model

3-294-738-3[]