SRS-X7 - 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.

DO  NOT  REPLACE  THE  LITHIUM  BATTERY 
(US and Canadian models only)
The LITHIUM BATTERY for US and Canadian models cannot 
be replaced. If it is necessary to replace the LITHIUM BATTERY, 
replace the entire unit with a new one.

NOTE  OF  REPAIRING  THE  BOARDS
When boards other than the MAIN board installed by this unit are 
defective, individual electrical parts that the mount is done cannot 
be replaced.
Replace the mounted board, or replace the whole parts including 
an applicable board.

NOTE  THE  CN301,  IC401  AND  IC402  ON  THE  MAIN  
BOARD  REPLACING
CN301, IC401 and IC402 on the MAIN board cannot replace 
with single. When these parts are damaged, replace the complete 
mounted board.

NOTE  OF  WiFi  MODULE  REPLACING
When the WiFi module is replaced, the MAC address and DTCP-
IP ID have been changed.
Print the page 5 and 7, and pass it to the customer with the repaired 
unit when you return the customer the repaired unit.

PROCESSING  OF  REPLACING  THE  WiFi  MODULE
When replacing the WiFi module (Ref. No. WIFI1), peel the de-
vice ID label stuck on the bottom side of the unit, and stick on the 
new device ID label enclosed with the new WiFi module (Ref. No. 
WIFI1).

1 Peel the device
 ID 

2 Stick on the new 
 

Device ID:       XXXXXXXXXXXX

MAC Address: XX-XX-XX-XX-XX-XX

 

As for US and Canadian models, device ID label may be stuck on 
the model number indication side.