background image
SERVICE MANUAL
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD.
No.49787
2003/01
CH-X550
CD CHANGER
49787
2003
01
CH-X550
TABLE OF CONTENTS
1
Important Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
2
Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3
Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
4
Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27
Area Suffix
E ------- Continental Europe


background image
CH-X550
1-2 (No.49787)
SECTION 1
Important Safety Precautions
1.1 Safety Precautions
!
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.
!
Please use enough caution not to see the beam directly or touch it in case of an
adjustment or operation check.


background image
CH-X550
(No.49787)1-3
1.2 Preventing 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.
1.2.1
Grounding to prevent damage by static electricity
Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as DVD players.
Be careful to use proper grounding in the area where repairs are being performed.
(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) Ground yourself
Use an anti-static wrist strap to release any static electricity built up in your body.
(3) Handling the optical pickup
· 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.)
· 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.
1.3 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) I t is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.
1.4 Attention when traverse unit is decomposed
*Please refer to "Disassembly method" in the text for the CD pickup unit.
· Apply solder to the short land before the flexible wire is disconnected from the connector on the CD pickup unit.
(If the flexible wire is disconnected without applying solder, the CDpickup may be destroyed by static electricity.)
· In the assembly, be sure to remove solder from the short land after connecting the flexible wire.
1M
(caption)
Anti-static wrist strap
Conductive material
(conductive sheet) or iron plate
Pickup
Short-circuit point
(Soldering)
Flexible wire
Pickup
Short-circuit point


background image
CH-X550
1-4 (No.49787)
SECTION 2
Disassembly method
2.1 Replacement of the pickup
(1) After removing the exterior (top and bottom).
(2) Proceed to the pickup replacement section.
(3) When applying grease, refer to the exploded view.
Use new grease.
2.2 Mechanism section
(1) Remove the exterior (required section only).
(2) The mechanism section is designed so that each unit can
be removed separately.
(3) When reassembling, refer to the assembling precautions
(Use new grease when applying grease.)
2.3 Exterior section
2.3.1 Removing the bottom cover and front panel assembly
(See Fig.1 to 4)
(1) Remove the two screw A to unlock the mounting direction
knob located on the side of the main unit.
(2) Turn the mounting direction knob in the direction of the ar-
row using a coin, etc. to remove it. (The knob can be re-
moved only when it is set to this position.)
(3) Remove the four top cover fixing screws B at the triangle
marks on the side of the main unit. (Perform the same op-
eration on both sides.)
(4) Turn the unit upside down so the bottom surface is facing
upward.
(5) Lift the rear edge of the bottom cover slightly and lift the
side by grasping the DIN jack section on the side panel,
then turn it toward the front (raise upward) to remove the
bottom cover.
(6) Unhook the four catches located on both sides of the front
panel, and turn the front panel toward the top cover (lower
down) to remove the front panel.
Fig.1
Fig.2
Fig.3
Fig.4
A
B
Remove A and turn in
the direction of the arrow.
B
B
B
Bottom cover
Knob
Remove A and turn in
the direction of the arrow
B
B
A
B
B
Bottom cover
Knob
The front panel can be
separated by raising the cover.
Slightly lift the jack
section to remove.
Bottom cover
Unhook catches
Unhook catches
Front panel


background image
CH-X550
(No.49787)1-5
2.3.2 Removing the top cover
(See Fig.5 to 9)
(1) Remove the four damper bracket fixing screws C to re-
move the damper brackets.
(2) Pull out the dampers, being careful not to damage them.
When reattaching a damper, insert your finger to push out
the center of the damper to mount it on the damper shaft,
as shown in Fig. 6-1.
(3) Turn the damper spring bracket toward the top at a right an-
gle as shown in Fig. 7, then push down the lower side of the
damper spring bracket to lift it off.
(4) Remove the three fixing screws D and E on the DIN jack
board assembly.
(5) Lift the changer unit upward.
(6) Remove the damper springs from the mechanism chassis
if required. To reassemble, refer to the diagram below.
Fig.5
Fig.6
Fig.6-1
Fig.7
Fig.8
Fig.8-1
Fig.9
C
C
Damper
Damper bracket
Damper
Damper bracket
C
C
Damper
Damper bracket
Damper bracket
Damper
Apply alcohol to the shaft then immediately
attach the damper. (After attaching, check
that the shaft is correctly inserted.)
Push out with your finger
before attaching
Damper shaft
Damper
Turn to the top position (at a right angle),
then push down to lift off.
Damper spring bracket
Lift the changer unit upward
How to attach the damper springs
Silver
(mechanism
side)
Black
(magazine
side)
Mechanism
Chassis
Damper
spring
Damper
spring
Remove the flexible ribbon
wire if required
E
E
D
DIN jack board