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SERVICE MANUAL
CD RECEIVER
No.49620
Feb. 2001
COPYRIGHT
2001 VICTOR COMPANY OF JAPAN, LTD.
KD-SX975 / KD-SX875
KD-SX975 / KD-SX875
Area Suffix
U ---- Other Areas
Contents
Safety precaution
Preventing static electricity
Location of main parts
Disassembly method
Adjustment method
1-2
1-3
1-4
1-5
1-10
Flow of functional
operation unit TOC read
Maintenance of laser pickup
Replacement of laser pickup
Discription of major ICs
1-11
1-13
1-13
1-14


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KD-SX975 / KD-SX875
1-2
!
Burrs formed during molding may be left over on some parts of the chassis. Therefore,
pay attention to such burrs in the case of preforming repair of this system.
Safety precaution
!
Please use enough caution not to see the beam directly or touch it in case of an
adjustment or operation check.


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KD-SX975 / KD-SX875
1-3
Front bracket
CD mechanism
control board
Damper bracket
CD mechanism ass'y
FD screw
Feed motor ass'y
FD gear
Pickup unit
Preventing static electricity
1.Grounding to prevent damage by static electricity
Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged,
can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.
2.About the earth processing for the destruction prevention by static electricity
Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as CD players.
Be careful to use proper grounding in the area where repairs are being performed.
2-1 Ground the workbench
Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over
it before placing the traverse unit (optical pickup) on it.
2-2 Ground yourself
Use an anti-static wrist strap to release any static electricity built up in your body.
3. Handling the optical pickup
1. In order to maintain quality during transport and before installation, both sides of the laser diode on the
replacement optical pickup are shorted. After replacement, return the shorted parts to their original condition.
(Refer to the text.)
2. Do not use a tester to check the condition of the laser diode in the optical pickup. The tester's internal power
source can easily destroy the laser diode.
4.Handling the traverse unit (optical pickup)
1. Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit.
2. Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific
details, refer to the replacement procedure in the text. Remove the anti-static pin when replacing the traverse
unit. Be careful not to take too long a time when attaching it to the connector.
3. Handle the flexible cable carefully as it may break when subjected to strong force.
4. It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it
Conductive material
(conductive sheet) or iron plate
(caption)
Anti-static wrist strap
Soldering
Attention when traverse unit is decomposed
1.Solder is put up before the card wire is removed from connector on
the CD substrate as shown in Figure.
(When the wire is removed without putting up solder, the CD pick-up
assembly might destroy.)
2.Please remove solder after connecting the card wire with
when you install picking up in the substrate.
*Please refer to "Disassembly method" in the text for pick-up and how to
detach the substrate.


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KD-SX975 / KD-SX875
1-4
Location of main parts
Control unit
Main unit
CD mechanism
Main board
16 pin connector
Power IC
Main board assembly
Loading motor
Damper
Damper
Damper
Spindle motor
Feed motor
Optical
pick up unit
Mechanism relay board
RCA jack
Connector to front PCB
Antenna
jack
Changer control
connector
Front PCB
Display
Tuner
pack


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KD-SX975 / KD-SX875
1-5
Disassembly method
Removing the front chassis (See Fig.1)
1. Remove two screws A and insert a screwdriver to the
joints a on the side of the front chassis and two joints b
on the right side, then detach the front chassis toward the
front side.
Removing the heat sink (See Fig.2 )
1. Remove the three screws B attaching the heat sink on
the left side of the body, and remove the heat sink.
Removing the bottom cover (See Fig.3 )
1.
2.
Turn the body upside down.
Insert a screwdriver to the two joints c and two joints d on
both sides of the body and the joint e on the back of the
body, then detach the bottom cover from the body.
Fig.1
Fig.2
Front chassis
b
a
a
b
Heat sink
B
B
B
Fig. 3
Regulator board
e
d
c
A
A