Jvc CH-X1500-CD Service Manual

49776200301

CH-X1500

SERVICE MANUAL

CD CHANGER

CH-X1500

Area Suffix

J Northern America E

Continental Europe

Other Areas

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

No.49776

2003/01

CH-X1500

1.1 Safety Precautions

SECTION 1

Important 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).

1-2

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.

(caption) Anti-static wrist strap

CH-X1500

Conductive material (conductive sheet) or iron plate

(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 shorte d 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 nipper s, e tc. after re pla cing th e optical picku p. For sp ecific 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.

Flexible wire

Pickup

Sorting round point

1-3

CH-X1500

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 assembly (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 removed 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.

SECTION 2

Bottom cover

AB B

Fig.2

Bottom cove

B B

BAB

Fig.1

Bottom cove

DIN jack

Fig.3

Joints

Fig.4

1-4

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.

CH-X1500

Turn to the top position (at a right angle) ,then the push down to lift off.

Damper spring bracket

Fig.7

Remove the card wire if required

DIN jack board

Dampe

Fig.5

Fig.8

Changer unit

Damper

Fig.6

pply alcohol to the shaft then immediately attach the damper. (After attaching, check that the shaft is correctly inserted.)

Damper shaft

Damper

Fig.9

Mechanisum chassis

Push out with your finger before attaching

Fig.6-1

Damper spring

Silver

(Mechanisum side)

Damper spring

Black

(Magazine side)

Fig.9-1

1-5

CH-X1500

2.3.3 Removing the fitting (See fig.10)

(1) Remove the screw E attaching the fitting. (2) Release the two joints a on the top edge of the fitting, then

release the joints b at the left / right bottom edges, and remove.

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

(1) Remove the screw F attaching the power IC. (2) Remove the four screws G attaching 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.10

CN501

CN604

CN602

Main board assembly

Fig.11

1-6

2.4 Changer-mechanism section

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

(1) Remove the two screws H attaching 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 c position to remove it from the chassis.

Spring

CH-X1500

Sensor assembly Magazine lock arm

Fig.12

Magazine lock springMagazine lock arm

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

(1) Remove the two screws I attaching 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.

Poly-washer

Fig.13

Burrs

Positioning moto

assembly

Spacer

Fig.14

1-7

CH-X1500

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 u nit 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).

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 direction 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.

Can be remove at the stud position

(At the wideness position)

Third gear

Fig.15

E-washer

Rear slider

Front slider

Third gear

Fig.16

1-8

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

(1) Remove the nine screws J attaching the top plate. (2) Disconnect the section d attached 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.

CH-X1500

Rod

Top plate

Fig.17

Top plate

Fig.18

1-9

CH-X1500

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.

Remove this part first

Elevator spring

Proper orientation

Fig.19

Lifter unit

Fig.20

Lower rod

1-10

2.4.8 Remove the lifter bracket (See fig.21)

(1) Remove the two screws K attaching the lifter bracket from

the back of the lifter unit.

(2) Remove the lower rod.

CH-X1500

2.4.9 Remove the side bracket and traverse mechanism assenbly (See fig.22)

(1) Remove the two screws L attaching the side bracket, and

remove the side bracket.

(2) Remove the three shafts on the traverse mech anism as-

sembly from the lifter unit.

Side bracket

Lifter bracket

Fig.21

Lifter unit

Fig.22

Traverse mechanism

assembly

1-11

CH-X1500

2.4.10 Remove the pickup assembly (See fig.23~26) CAUTION:

When replacing the flexible wire connected, solder the shorting round point. Otherwise, the pickup may be damaged. (1) Remove the three screws M attaching the mechanism

board on the back of the traverse mechanism assembly.

(2) Disconnect the two feed motor wires (blue and white), two

spindle motor wires (red and black) and two tray motor wires (brown and black) that are soldered to the mechanism board assembly.

(3) Move and lift mechanism board assembly with the flexible

wire attached to connector CN603. Next, solder the sorting round point on the pickup assembly and then disconnect CN603.

(4) Remove the screw N attaching the feed motor assembly,

and remove.

(5) Remove the screw O attaching the shaft holder retaining

the feed slide shaft assembly and the middle gear, and remove.

(6) Remove the middle gear.

REFERENCE:

Remove gears and motors only when required.

(7) Move the pickup assembly upward from the gear section

and remove it from the traverse chassis assembly.

(8) Remove the two screws P attaching the rack arm, and re-

move.

(9) Pull out the feed slide shaft assembly, and remove.

(10) Remove the screw Q attaching the spring, and remove.

CAUTION:

When reassembling, connect the flexible wire from the pickup to the main board and unsolder the shorting round point.

Flexible wire

Spindle motor wire

CN603

Tray motor wire

Flexible wire

Pickup

Sorting round point

Fig.24

Pickup assembly

Shaft holder

Feed slide shaft

assembly

Middle gear

Feed motor

Traverse chassis

Feed motor

Feed motor wire

Fig.25

Spring

Spindle motor

Mechanism board

Fig.23

Feed slide shaft assembly

Lack arm

Fig.26

1-12

2.4.11 Removing the tray motor assembly (See fig.27, 28)

(1) Remove the two screws R attaching the tray motor as-

sembly, and remove.

(2) Remove the two screws S attaching the tray motor, and

remove the tray motor assembly from the tray motor holder.

CH-X1500

Tray motor assembly

Fig.27

Tray motor

Tray motor holder

2.4.12 Separation of the chassis (L) assembly and chassis (R) assembly (See fig.29)

(1) Remove the two screws T retaining the chassis (L) and

(R) assemblies.

(2) Slide the chassis (L) assembly toward the front and detach

it, then remove the chassis (L) upward.

Front side

Fig.28

Chassis(L) assembly

Fig.29

Chassis(R) assembly

1-13

CH-X1500

2.5 Precautions reassembling REFERENCE:

When reassembling, also refer to the disassembling procedures.

2.5.1 Mounting the traverse mechanism assembly (See fig.30~34)

(1) When mounting the pickup assembly, attach the feed slide

shaft assembly to the traverse chassis. Apply E-JC-525 grease to the shaft.

(2) Mount the middle gear and the feed slide shaft to the

traverse chassis and secure them with the screw O through the shaft holder.

(3) Before attaching the mechanism board, move the pickup

to the outer edge position, then attach the mechanism board using the screw M. At this time, check that the rest switch is correctly placed.

(4) To mount the rack arm, first move the pickup to the middle

position and fixing it with the screw P.

CAUTION:

When reassembling the mechanism board, reattach the flexible wire to connector CN603 on the mechanism board, and then unsolder the sorting round point. Next, reattach the mechanism board with screw M.

Pickup assembly

Mechanism board

Rest switch

Pickup

Flexible wire

CN603

Fig.32

Flexible wire

Feed motor

Feed motor assembly

Fig.30

Shaft holder

Feed slide shaft

assembly

Middle gear

Traverse chassis

Sorting round point

Fig.33

Lack arm

Pickup

Fig.34

1-14

Spindle motor

Shaft holder

Fig.31

+ 30 hidden pages