JVC CHX1500 - CD Changer Manuale utente

SERVICE MANUAL

2003/01

CH-X1500

CD CHANGER

49776200301 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

Continental Europe

Other Areas

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).

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.

(caption)

Anti-static wrist strap

Conductive material

(conductive sheet) or iron plate

Flexible wire

Sorting round point

Pickup

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 Ato 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 Battaching 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

BAB

Bottom cove

AB B

Bottom cover

Bottom cove

DIN jack

Joints

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 Cand Dattaching 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

Dampe

Damper

Damper shaft Damper

Push out with your finger

before attaching

pply 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

Remove the card

wire if required

Changer unit

Mechanisum chassis

Damper spring

Black

(Magazine side)

Damper spring

Silver

(Mechanisum side)

CH-X1500

1-6

2.3.3 Removing the fitting (See fig.10)

(1) Remove the screw Eattaching the fitting.

(2) Release the two joints aon the top edge of the fitting, then

release the joints bat the left / right bottom edges, and

remove.

Fig.10

2.3.4 Removing the main board assembly (See fig.11)

(1) Remove the screw Fattaching the power IC.

(2) Remove the four screws Gattaching the main board as-

sembly, and remove.

(3) Disconnect the wire from connector CN602 on the main

board assembly.

(4) Disconnect the wire from connector CN501 on the main

board assembly.

(5) Disconnect the card wire from connector CN604 on the

traverse mechanism board assembly.

Fig.11

CN501

CN602 Main board assembly

CN604

CH-X1500

1-7

2.4 Changer-mechanism section

2.4.1 Remove the sensor assembly unit (See fig.12)

(1) Remove the two screws Hattaching the sensor assembly

unit.

(2) Release the springs on the back of the sensor assembly

unit from the holes on the chassis.

2.4.2 Remove the magazine lock arm (See fig.12,13)

(1) Remove the magazine lock spring from the front side of

the chassis.

(2) Remove the poly-washer attaching the magazine lock

arm.

(3) Turn the magazine lock arm in the direction of the arrow

until the notch is at the cposition to remove it from the

chassis.

Fig.12

Fig.13

2.4.3 Remove the positioning motor assembly (See fig.14)

(1) Remove the two screws Iattaching the positioning motor.

ATTENTION:

When removing the positioning motor assembly from

chassis, remove the spacer attaching the wires.

(2) Slightly lift the positioning motor assembly to remove it

from the two burrs on the chassis.

Fig.14

Spring

Sensor assembly Magazine lock arm

Magazine lock springMagazine lock arm

Poly-washer

Positioning moto

assembly

Spacer

Burrs

CH-X1500

1-8

2.4.4 Remove the rear slider (See fig.15)

(1) Position the unit with the front section facing down. Rotate

the third gear located on the back of the main unit in the

direction of the arrow (clockwise).

(2) Move the rear slider in the direction of the arrow and re-

move it at the rear slider mounting position (at the widest

hole).

Fig.15

2.4.5 Remove the front slider (See fig.16)

(1) Position the unit with the rear section facing down. Rotate

the third gear located on the bottom of the unit in the direc-

tion of the arrow (clockwise) until the front slider is moved

to the outermost position.

(2) Remove the E-washer attaching the front slider, and re-

move from the chassis.

Fig.16

Third gear

Rear slider

Can be remove at the stud position

(At the wideness position)

Third gear

Front slider

E-washer

CH-X1500

1-9

2.4.6 Remove the top plate (See fig.17,18)

(1) Remove the nine screws Jattaching the top plate.

(2) Disconnect the section dattached to the rear of the unit,

then lift the top plate slightly.

(3) Move the top plate toward the rear of the unit to remove

the upper rod from the top plate.

Fig.17

Fig.18

Rod

Top plate

CH-X1500

1-10

2.4.7 Remove the lifter unit (See fig.19,20)

(1) Remove the elevator spring located on the front side of the

unit. (Be sure to first remove the spring from the lifter side

as shown in the upper part of the diagram.)

(2) Lift the lifter unit upward, then remove the lower rod to re-

move the lifter unit from the chassis.

Fig.19

Fig.20

Remove this part first

Proper orientation

Elevator spring

Lower rod

Lifter unit

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