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SERVICE MANUAL
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD.
No.49776
2003/01
CH-X1500
CD CHANGER
49776
2003
01
CH-X1500
TABLE OF CONTENTS
1
Important Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
2
Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4
3
Adjustment method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-22
4
Description of major ICs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-30
Area Suffix
J
Northern America
E
Continental Europe
U
Other Areas


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CH-X1500
1-2
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.
!
This unit can only be connected to the JVC car receivers/controllers equipped with
MP3-CD changer control functions. If connected to any other receiver/controller, this
unit cannot work (even CDs may not play back).


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CH-X1500
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
Flexible wire
Sorting round point
Pickup


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CH-X1500
1-4
SECTION 2
Disassembly method
Perform operations according to the items to be disassembled.
2.1 Replacement of the Pickup
(1) After removing the exterior (top and bottom).
(2) Proceed to the "2.5.8.Pickup replacement procedure" sec-
tion.
(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 2-5.Precautions reassem-
bling. (Use new grease when applying grease.)
2.3 Exterior Section
2.3.1 Removing the bottom cover and front panel assem-
bly (See fig.1~4)
(1) Remove the 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 screws B attaching the bottom cover on
both sides of the main unit.
(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) Release the four joints 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
B
B
B
A
B
Bottom cover
AB
B
B
B
Bottom cover
Bottom cover
DIN jack
Joints
Joints


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CH-X1500
1-5
2.3.2
Removing the top cover (See fig.5~9)
(1) Pull out the dampers, being careful not to damage them.
REFERNCE:
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.
(2) Turn the damper spring bracket toward the top at a right
angle as shown in Fig. 7, then push down the lower side
of the damper spring bracket to lift it off.
(3) Remove the three screws C and D attaching the DIN jack
board assembly, and remove.
(4) Lift the changer unit upward.
(5) Remove the damper springs from the mechanism chassis
if required.
REFERENCE:
To reassemble, refer to the diagram below.
Fig.5
Fig.6
Fig.6-1
Fig.7
Fig.8
Fig.9
Fig.9-1
Damper
Damper
Damper shaft
Damper
Push out with your finger
before attaching
Apply alcohol to the shaft then
immediately attach the damper. (After
attaching, check that the shaft is
correctly inserted.)
Damper spring bracket
Turn to the top position (at a right
angle) ,then the push down to lift off.
DIN jack board
D
C
D
Remove the card
wire if required
Changer unit
Mechanisum chassis
Damper spring
Black
(Magazine side)
Damper spring
Silver
(Mechanisum side)