HCD-SX7, HCD-SX7B - Sony Audio Service Manual (repair manual). Page 4

The laser diode in the optical pick-up block may suffer electro-
static break-down because of the potential difference generated by 
the charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also 
use the procedure in the printed matter which is included in the 
repair parts.
The fl exible board is easily damaged and should be handled with 
care.

NOTES  ON  LASER  DIODE  EMISSION  CHECK
The laser beam on this model is concentrated so as to be focused 
on the disc refl ective surface by the objective lens in the optical 
pickup block. Therefore, when checking the laser diode emission, 
observe from more than 30 cm away from the objective lens.

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, the electrical discharge is necessary for 
the electric shock prevention.
Connect the resistor to between terminals of respective capacitors.

:/2 W

:/2 W

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

SX7: AEP, UK

4-549-205-1[]

(CEL/CEK)

SX7B: AEP, UK

4-549-205-2[]

(CEL/CEK)

SX7B: Australian

4-549-205-3[]

(AU1)

SX7: Russian

4-549-205-4[]

(RU1)

SX7: Canadian

4-549-205-5[]

(CA2)

SX7: Singapore

4-549-205-6[]

(SP1)

SX7: Thai

4-549-205-7[]

(TH1)

SX7: Argentina

4-549-205-8[]

(AR2)

SX7: Latin American 
(Except for Argentina)

4-549-205-9[]

(E32)

SX7: Indonesian

4-573-171-0[]

(IA2)

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

• Abbreviations
 AR  : 

Argentina 

model

 AUS : 

Australian 

model

  CND  : Canadian model
  E32 

: Latin American model (Except for Argentina)

  IDN 

: Indonesian model

  RU 

: Russian model

  SP 

: Singapore model

 TH  : 

Thai 

model

NOTE  OF  REPLACING  THE  TUNER  BOARD 
(HCD-SX7 only)
When the TUNER board is defective, replace the complete mount-
ed board. The individual mounted electrical parts cannot replace 
and repair.

NOTE  OF  REPLACING  THE  DAB  BOARD 
(HCD-SX7B only)
When the DAB board is defective, replace the complete mounted 
board. The individual mounted electrical parts cannot replace and 
repair.

NOTE  OF  REPLACING  THE  MS-476  BOARD
When the MS-476 board is defective, replace the CDM90 ASSY 
(Ref. No. CDM1).

IC204,  IC502  AND  IC605  ON  THE  MAIN  BOARD
IC201, IC202, IC203, IC204, IC502 and IC605 on the MAIN 
board cannot replace with single. When these parts are damaged, 
replace the complete mounted board.