HT-CT150, HT-CT350, SA-WCT150, SA-WCT350 - 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.

WCT150: US and Canadian models

4-166-506-0

[]

WCT350: US and Canadian models

4-174-743-0

[]

WCT350: AEP model

4-174-931-0

[]

WCT350: UK model

4-174-933-0

[]

WCT350: Russian model

4-174-934-0

[]

WCT150: Saudi Arabia model

4-177-835-0

[]

WCT150: Chilean and Peruvian 
 

models

4-184-061-0

[]

WCT150: Singapore model

4-184-062-0

[]

WCT350: Singapore model

4-184-063-0

[]

WCT350: Taiwan model

4-184-064-0

[]

WCT350: Thai model

4-184-065-0

[]

ADVANCE  PREPARATION  WHEN  CONFIRMING  OP-
ERATION
When the operation of the subwoofer (SA-WCT150/WCT350) is 
confi rmed, it is necessary to connect subwoofer (SA-WCT150/
WCT350) and satellite speaker (SS-CT150/CT350).
Confi rm the subwoofer (SA-WCT150/WCT350) and satellite 
speaker (SS-CT150/CT350) are prepared beforehand when you 
repair.

NOTE  THE  IC3500  AND  IC3501  ON  THE  HDMI  BOARD  
REPLACING
IC3500 and IC3501 on the HDMI board cannot exchange with sin-
gle. When these parts are damaged, exchange the entire mounted 
board.

NOTE  OF  REPLACING  THE  IC340  AND  IC400  ON  THE  
MAIN  BOARD  AND  THE  COMPLETE  MAIN  BOARD 
When IC340 and IC400 on the MAIN board and the complete 
MAIN board are replaced, it is necessary to spread the compound 
(THERMAL COMPOUND G747) (Part No. J-2501-221-A) be-
tween the main board and the heat sink.
Spread the compound referring to the fi gure below.

CAPACITOR  ELECTRICAL  DISCHARGE  PROCESSING 
When checking the board, for the electric shock prevention, con-
nect the resistors to both ends of respective capacitor (C903) to 
discharge the capacitor (C903).

:/2 W

• JIG
  When disassembling the set, use the following jig (for speaker 

removal).

  Part No. J-2501-238-A  JIG FOR SPEAKER REMOVAL