SA-WCT780 - Sony Audio Service Manual (repair manual). Page 5

ADVANCE  PREPARATION  WHEN  CONFIRMING  OP-
ERATION
All of the units included in the HT-CT780 (SA-WCT780/SA-
CT780/Remote control) are required to confi rming operation of 
SA-WCT780. Check in advance that you have all of the units.

NOTE  OF  REPLACING  THE  SW-KEY  BOARD
When the SW-KEY board is defective, replace the complete 
mounted board.

NOTE  OF  REPLACING  THE  IC100  ON  THE  SW-MAIN  
BOARD
IC100 on the SW-MAIN board cannot replace with single. When 
this part is damaged, replace the complete mounted board.

NOTE  OF  REPLACING  THE  IC104  ON  THE  SW-MAIN  
BOARD  AND  THE  COMPLETE  SW-MAIN  BOARD
When IC104 on the SW-MAIN board and the complete SW-MAIN 
board are replaced, it is necessary to spread the compound between 
the SW-MAIN board and the heat sink.
Spread the compound referring to the fi gure below.

NOTES  ON  THE  WIRELESS  CONNECTION (LINK)  AFTER  
REPAIRS  ARE  COMPLETE
When the parts below is replaced, the wireless connection (LINK) 
of the Bar speaker and Subwoofer will be disconnected.
Before returning repaired products to the customer, follow the pro-
cedure below to LINK the Bar speaker and Subwoofer.
Also, if only the Bar speaker or Subwoofer is brought in for repair 
and the parts below are replaced, be sure to inform the customer 
when returning the repaired products that the customer must LINK 
the Bar speaker and Subwoofer.
(Indicate that the LINK procedure is described in the operating 
instructions)

Parts in which the LINK will be disconnected due to re-
placement:
• 

Complete SW-MAIN board

• 

RF modulator (SWA12-4V RX) (Ref. No. RF1)

Set up the wireless subwoofer 
connection again.

1

2

Select [WS] with j „ (select), then 
press ENTER.

3

Select [LINK] with j „ (select), then 
press ENTER.

4

When [START] appears on the 
display, press ENTER.
[SEARCH] appears, and the Bar 
Speaker searches for a device that 
can be used with Link. Proceed to 
the next step within 1 minute.
To quit the Link function while 
searching for a device, press BACK.

5

Press LINK on the subwoofer.
The on/standby indicator on the 
subwoofer lights up in green. [OK] 
appears on the display of the Bar 
Speaker.
If [FAILED] appears, check to ensure 
the subwoofer is turned on and 
perform the process again from 
step 1.

6

Press MENU.
The menu turns off.

– Press the Ò/Æ (on/standby) 

button of the subwoofer to turn 
off the power and check 
whether the ventilation opening 
of the subwoofer is blocked or 
not.

Ç