HT-CT550W, STR-CT550WT - 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.

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.

CAPACITOR  ELECTRICAL  DISCHARGE  PROCESSING 
When checking the board, for the electric shock prevention, con-
nect the resistors to both ends of respective capacitor (C935 or 
936) to discharge the capacitor (C935 or 936).

:/2 W

ADVANCE  PREPARATION  WHEN  CONFIRMING  OP-
ERATION
All of the units included in the HT-CT550W (SA-WCT550W/SS-
CT550W/STR-CT550WT (main unit)/EZW-RT50) are required to 
confi rming operation of the main unit. Check in advance that you 
have all of the units.

COMPLETING  SETTINGS  FOR  THE  WIRELESS  
SOUND SYSTEM
Procedure:
1.  Insert the two supplied wireless transceivers (EZW-RT50) into 

the wireless transceiver slot on the rear panel of both the re-
ceiver (STR-CT550WT) and the subwoofer (SA-WCT550W).

 

Rear panel of the receiver (STR-CT550WT)

Wireless transceiver
(EZW-RT50)

Rear panel of the subwoofer (SA-WCT550W)

Wireless transceiver
(EZW-RT50)

2. Press the [

?/1

] (Power) button on the receiver (STR-CT550

WT: main unit). 

3.  If wireless transmission is activated, the LINK/STANDBY in-

dicator on the subwoofer (SA-WCT550W) turns green. 

Note: Refer to the instruction manual for assistance if the LINK/STAND-

BY indicator on the subwoofer (SA-WCT550W) does not turn on.

US and Canadian models

- 120V 60Hz 50W

AEP and UK models

- 220-240V 50/60Hz 50W

Taiwan model

- 120V 50/60Hz 50W

NOTE  OF  REPLACING  THE  IC3100  ON  THE  MAIN  
BOARD  AND  THE  COMPLETE  MAIN  BOARD
When IC3100 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) between the main 
board and the heat sink.
Spread the compound referring to the fi gure below.