STR-KM22, STR-KM55, STR-KM77 - Sony Audio Service Manual (repair manual). Page 4

Notes on chip component replacement
• 

Never reuse a disconnected chip component.

• 

Notice that the minus side of a tantalum capacitor may be da-

 

maged by heat.

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 viscou-s (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.

Special Component Notice
The components identifi ed by mark 

9 contain confi dential

information.
Strictly follow the instructions whenever the components are
repaired and/or replaced.

NOTE  OF  REPLACING  THE  IC2010,  IC2700  AND 
IC2903  ON  THE  MAIN BOARD
IC2010, IC2700 and IC2903 on the MAIN board cannot exchange 
with single. When these parts on the MAIN board are damaged, 
exchange the entire mounted board.

NOTE  OF  REPLACING  THE  IC3009  ON  THE  HDMI 
RE PC BOARD
IC3009 on the HDMI RE PC board cannot exchange with single. 
When these parts on the HDMI RE PC board are damaged, ex-
change the entire mounted board.

NOTE  OF  REPLACING  THE  IC5001  ON  THE  DSP  
BOARD
IC5001 on the DSP board cannot exchange with single. When 
these parts on the DSP board are damaged, exchange the entire 
mounted board.

KM77: SAF

4-485-866-0[]

KM77: SP

4-485-866-2[]

KM77: AUS

4-485-866-3[]

KM77: E51

4-485-866-5[]

KM77: AR

4-485-866-7[]

KM55: E12

4-489-706-1[]

KM55: SAF

4-489-706-2[]

KM55: EA

4-489-706-3[]

KM55: E51

4-489-706-5[]

KM55: AR

4-489-706-7[]

KM55: TH

4-489-706-9[]

KM22: SAF

4-489-707-0[]

KM22: EA

4-489-707-1[]

KM22: SP

4-489-707-2[]

KM22: TH

4-489-707-4[]

KM22: E51

4-489-707-5[]

KM22: AR

4-489-707-8[]

• Abbreviation
 AR   

: 

Argentina 

model

 AUS  

: 

Australian 

model

  E12 

 : 220-240 V AC area in E model

  E51 

 : Chilean and Peruvian models

  EA 

 : Saudi Arabia model

  SAF 

 : South African model

  SP 

 : Singapore model

 TH   

: 

Thai 

model