HT-ST9 - Sony Audio Service Manual (repair manual). Page 5

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  OF  PERFORMING  THE  OPERATION  CHECK  IN  
THE  STATE  THAT  HEAT  SINK  WAS  REMOVED
When performing the operation check in the state that this unit was 
disassembled, it is possible to perform the operation check in the 
state that heat sink was removed. But don’t perform the operation 
check in the long time, and perform the operation check in the 
volume state as low as possible.

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

:/2 W

:/2 W

MODEL  IDENTIFICATION
Distinguish by Part No. and Destination code on the rear side of 
a main unit.

Destination code

Part No.

US and Canadian models

4-562-118-0[]

(UC2)

AEP model

4-562-118-2[]

(CEL)

UK model

4-562-118-3[]

(CEK)

Russian model

4-562-118-4[]

(RU3)

Singapore model

4-562-118-7[]

(SP1)

Chinese model

4-562-118-8[]

(CN4)

Australian model

4-562-118-9[]

(AU1)

Taiwan model

4-562-119-1[]

(TW2)

Latin American model

4-562-119-2[]

(LA9)

DESTINATION  ABBREVIATIONS
The following abbreviations for model destinations are used in this 
service manual.

• Abbreviations
 AUS : 

Australian 

model

  CH 

: Chinese model

  CND  : Canadian model
  LA 

: Latin American model

  RU 

: Russian model

  SP 

: Singapore model

 TW  : 

Taiwan 

model

ADVANCE  PREPARATION  WHEN  CONFIRMING  OP-
ERATION
All of the units included in the HT-ST9 (SA-ST9/SA-WST9/Re-
mote control) are required to confi rming operation of SA-ST9. 
Check in advance that you have all of the units.

NOTE  OF  REPAIRING  THE  REPEATER_REP1, RE-
PEATER_REP2  OR  KEY  BOARDS
When the REPEATER_REP1, REPEATER_REP2 or KEY boards 
installed by this unit are defective, replace the complete mounted 
board.
The mounted parts cannot replace with single.

NOTE  OF  REPAIRING  THE  MB1406  BOARD
When MB1406 board installed by this unit are defective, replace 
the complete mounted board.
The mounted parts cannot replace with single.
Block diagram and printed wiring board that have been described 
on this service manual are for reference.
Schematic diagram have not described.