SERVICE MANUAL
CD/CASSETTE RECEIVER
No.49687
Feb. 2002
COPYRIGHT
2002 VICTOR COMPANY OF JAPAN, LTD.
KW-XC777
KW-XC777
Contents
Safety precaution
Preventing static electricity
Disassembly method
Adjustment method
Flow of functional operation
untill TOC read
Maintenance of laser pickup
Replacement of laser pickup
Description of major ICs
1- 2
1- 3
1- 4
1-23
1-27
1-29
1-29
1-30~47
Area Suffix
U
Other Areas
EX
KW-XC777
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.
KW-XC777
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
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.
(caption)
Anti-static wrist strap
Conductive material
(conductive sheet) or iron plate
KW-XC777
1-4
Remove the four screws A
on both sides of the
body.
Release four joints a on both sides of the body using
a screwdriver and remove the front panel assembly
toward the front. The connector which connects the
front panel assembly with the rear section comes off.
1.
2.
Disassembly method
Removing the front panel assembly
(See Fig.1 to 3)
When reassembling, make sure that
connector CN501 on the front panel
assembly is securely connected to
CN701 on the main board (See Fig.3).
CAUTION:
A
A
A
A
CN701
CN501
Joint a
Joint a
Front panel assembly
Fig.1
Fig.2
Joint a
Joint a
Front panel assembly
Fig.3
Front panel assembly
KW-XC777
1-5
Prior to performing the following procedure, remove
the front panel assembly.
Remove the twelve screws B retaining the system
control board.
Remove the five screws C
retaining the switch
board.
Unsolder
WR501
and
WR502
of
the
wires
connecting the system control board with the switch
board.
1.
2.
3.
Removing the system control board /
switch board (See Fig.4 to 5)
B
B
B
Switch board
Switch board
System control board
CC
B
WR502
WR502
WR501
WR501
WR502
Fig.4
Fig.5
System control board
B