GTK-N1BT - Sony Audio Service Manual (repair manual). Page 4

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.

NOTE  OF  REPLACING  THE  TUNER  BOARD
When the TUNER board is defective, exchange the complete 
mounted board.

NOTE  OF  REPLACING  THE  SMPS  BOARD
When the SMPS board is defective, exchange the complete mount-
ed board.

NOTE  OF  REPLACING  THE  IC105,  IC302,  IC604,  IC803,  
IC804  AND  IC806  ON  THE  MAIN  BOARD
IC105, IC302, IC604, IC803, IC804 and IC806 on the MAIN 
board cannot exchange with single. When these parts are damaged, 
exchange the complete mounted board.

NOTE  OF  OPERATION  CHECK
It is possible to perform the operation check in the state that fan 
motor (Ref. No. M1) is removed. But perform the operation check 
in the state that fan motor (Ref. No. M1) is connected, when per-
forming the operation check at high volumes.

CHECKING  THE  OPERATION  AFTER  REPAIR
After repair completion, connect the “iPhone” etc. corresponding 
to this unit, and check the operation of playback, charge, etc.

Canadian

z

–

AEP

z

–

UK

z

–

120V AC area in E

z

z

Australian

z

–

Russian

z

–

Mexican

–

z

Argentina

z

z

Chilean and Peruvian

z

–

Singapore and Malaysia

z

–

Thai

z

–

Indian

z

z

NOTE  OF  REPLACING  THE  IC606  ON  THE  MAIN  BOARD  
AND  THE  COMPLETE  MAIN  BOARD
When IC606 on the MAIN board or the complete MAIN board 
are replaced, it is necessary to spread the compound between the 
MAIN board and the heat sink.
Spread the compound referring to the fi gure below.

CAPACITOR  ELECTRICAL  DISCHARGE  PROCESSING
When checking the board, the electrical discharge is necessary for 
the electric shock prevention.
Connect the resistor to both ends of respective capacitors.

• MAIN 

board

 C715, 

C801

:/2 W

:/2 W

• SMPS 

board

 

C914, C967, C969

:/2 W

:/2 W

:/2 W