HCD-SX7/SX7B
4
SECTION 1
SERVICING NOTES
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
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 re
fl
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)
: LEAD FREE MARK
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.
– POWER UNIT (Conductor Side) –
800
:
/2 W
(for C114)
800
:
/2 W
(for C201)
MODEL IDENTIFICATION
Distinguish by Part No. and Destination code on the rear side of
a main unit.
– Rear Panel –
Part No.
Destination code
Model
Part No.
Destination code
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).
NOTE OF REPLACING THE IC201, IC202, IC203,
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.
The SERVICING NOTES contains important information for servicing. Be sure to read this section before repairing the unit.
Ver. 1.1
SYS SET
2020/02/27 22:53:44 (GMT+09:00)
