JVC KW-XC55 Bedienungsanleitung

SERVICE MANUAL

2003/10

CD/CASSETTE RECEIVER

49784200310 KW-XC55

TABLE OF CONTENTS

1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

2 SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27

Area suffix

UN ----------------------------Asean

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1-2 (No.49784)

SECTION 1

PRECAUTION

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.

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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 CD 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) It 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 CD pickup 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

Short round

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SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

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SECTION 3

DISASSEMBLY

3.1 Main body

3.1.1 Removing the front panel assembly

(See Fig.1, 2)

(1) From the both side of the main body, remove the four

screws Aattaching the front panel assembly. (See Figs.1,

(2) Release the four joints ausing a screwdriver, then remove

the front panel assembly toward the front. (See Figs.1, 2)

Fig.1

Fig.2

3.1.2 Removing the rear bracket

(See Figs.3)

• Prior to performing the following procedure, remove the front

panel assembly as required.

(1) From the back side of the main body, remove the ten

screws B, screw Cand screw Dattaching the rear bracket.

(2) Take out the rear bracket.

Fig.3

3.1.3 Removing the heat sink

(See Fig.4)

• Prior to performing the following procedure, remove the front

panel assembly as required.

(1) From the left side of the main body, remove the two screws

Eand three screws Fattaching the heat sink.

Fig.4

Front panel assembly

Joints a

Front panel assembly

Rear braket

FFE

Heat sink

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3.1.4 Removing the top chassis assembly and bottom chassis assembly

(See Fig.5 to 7)

• Prior to performing the following procedures, remove the front

panel assembly, rear bracket and heat sink.

(1) From the back side of the main body, disconnect the card

wire from the connector CN702 on the main board in the

top chassis assembly. (See Fig.5)

(2) From the both side of the main body, remove the three

screws Gattaching the bottom chassis assembly. (See

Figs.6, 7)

(3) Release the four joints busing a screwdriver, and then

remove the top chassis assembly upward from the bottom

chassis assembly. (See Figs.6, 7)

Fig.5

Fig.6

Fig.7

3.1.5 Removing the main board

(See Fig.8)

• Prior to performing the following procedures, remove the front

panel assembly, rear bracket, heat sink, top chassis assembly

and bottom chassis assembly.

(1) From the bottom side of the top chassis assembly, remove

the three screws Hattaching the main board.

(2) Disconnect the connector CN501 on the main board, and

take out the main board from the top chassis assembly.

Reference:

• When attaching the main board, joint the hole of the main

board in joint cof the top chassis assembly.

Fig.8

CN702

Card wire Main board

Top chassis assembly

Bottom chassis assembly

Joints b

Top chassis assembly

Bottom chassis assembly

Joints b

CN601

Main board

Top chassis assembly

Joints c

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3.1.6 Removing the CD mechanism assembly

(See Fig.9)

• Prior to performing the following procedures, remove the front

panel assembly, rear bracket, heat sink, top chassis assembly,

main board and CD mecha control board.

(1) Remove the three screws Jattaching the CD mechanism

assembly to the top chassis assembly.

Reference:

• When attaching the CD mechanism assembly, joint the hole

of the CD mechanism assembly in boss dand boss eof the

top chassis assembly.

Fig.9

3.1.7 Removing the changer control board

(See Fig.10, 11)

• Prior to performing the following procedures, remove the front

panel assembly, rear bracket, heat sink, top chassis assembly

and bottom chassis assembly.

(1) From the back side of the bottom chassis assembly,

disconnect the card wire from the connector CN972 on the

changer control board. (See Fig.10)

(2) From the top side of the bottom chassis assembly, remove

the two screws Kattaching the changer control board. (See

Fig.11)

Reference:

• When attaching the changer control board, joint the hole of

the changer control board in joints fof the bottom chassis

assembly.

Fig.10

Fig.11

3.1.8 Removing the mecha control board

(See Fig.12)

• Prior to performing the following procedures, remove the front

panel assembly, rear bracket, heat sink, bottom chassis

assembly and changer control board.

(1) From the back side of the bottom chassis assembly,

remove the screw Lattaching the mecha control board,

and release the joints gfrom the bottom chassis assembly.

(2) Disconnect the wire from the connector CJ402 and the

card wire from the connector CN403 on the mecha control

board.

Reference:

• When attaching the mecha control board, joint the hole of

the mecha control board in joints iof the bottom chassis

assembly.

Fig.12

CD mechanism assembly

Boss e

Boss d

Top chassis assembly

CN972

Card wire

Changer control board

Bottom chassis assembly

Changer control board

Bottom chassis assembly

Joint f

Cassette mechanism assembly

Top chassis assembly Mecha control board

Joint g

CN403CJ402

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3.1.9 Removing the cassette mechanism assembly

(See Fig.13)

• Prior to performing the following procedures, remove the front

panel assembly, rear bracket, heat sink, bottom chassis

assembly, changer control board and mecha control board.

(1) From the bottom side of the bottom chassis assembly,

remove the four screws Mattaching the cassette

mechanism assembly to the bottom chassis assembly.

Fig.13

3.1.10 Removing the LCD board

(See Fig.14)

• Prior to performing the following procedures, remove the front

panel assembly.

(1) From the back side of front panel assembly, remove the

twelve screws Nattaching the LCD board, and then turn

over the LCD board.

(2) From the reverse side of LCD board, remove the solders

from the soldered points hattaching the wire.

Fig.14

3.1.11 Removing the switch board

(See Fig.15)

• Prior to performing the following procedures, remove the front

panel assembly.

(1) From the back side of front panel assembly, remove the

five screws Pattaching the switch board.

(2) Release the claws i attaching the switch board, and then

turn over the switch board.

(3) From the reverse side of switch board, remove the solders

from the soldered points jattaching the wire.

Fig.15

Cassette mechanism assembly

Bottom chassis assembly

Front panel assembly

LCD board Solder points h

Front panel assembly

Switch board

Claws i

Solder points j

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3.2 CD mechanism assembly

3.2.1 Removing the CD mechanism control board

(See Fig.1 and 2)

(1) Unsolder the part aand bon the CD mechanism control

board.

(2) Remove the stator fixing the CD mechanism control board

and the damper bracket (To remove the stator smoothly,

pick up the center part).

(3) Remove the screw A attaching the CD mechanism control

board.

(4) Remove the CD mechanism control board in the direction

of the arrow while releasing it from the two damper bracket

slots dand the front bracket slot e.

(5) Disconnect the flexible wire from connector on the pickup

unit.

ATTENTION:

Turn the FD gear in the direction of the arrow to move the en-

tire pickup unit to the appropriate position where the flexible

wire of the CD mechanism unit can be disconnected easily.

(Refer to Fig.2)

Fig.1

Fig.2

3.2.2 Removing the loading motor

(See Fig.3 to 5)

• Prior to performing the following procedure, remove the CD

mechanism control board.

(1) Remove the two springs f attaching the CD mechanism as-

sembly and the front bracket.

(2) Remove the two screws Band the front bracket while pull-

ing the flame outward.

(3) Remove the belt and the screw C from the loading motor.

Fig.3

Fig.4

Fig.5

Front bracket CD mechanism

control board

Damper bracket

CD mechanism assembly

Shift the lock

Flexible wire

Pickup unit

FD gear

CD mechanism control board

Loading motor Front bracket

Front bracket Pull outward

Pull outward

Flame

Loading motor

Belt

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3.2.3 Removing the CD mechanism assembly

(See Fig.1, 6 to 9)

• Prior to performing the following procedure, remove the CD

mechanism control board and the front bracket (loading mo-

tor).

(1) Remove the three screws Dand the damper bracket.

(2) Raise the both sides fix arms and move the fix plates in the

direction of the arrow to place the four shafts gas shown in

Fig.8 and 9.

(3) Remove the CD mechanism assembly and the two springs

hattaching the flame.

(4) Remove the two screws Eand both sides rear damper

brackets from the dampers. Detach the CD mechanism as-

sembly from the left side to the right side.

ATTENTION:

The CD mechanism assembly can be removed if only the rear

damper bracket on the left side is removed. Fig.1

Fig.6

Fig.7

Fig.8

Fig.9

Front bracket CD mechanism

control board

Damper bracket

CD mechanism assembly

Damper bracket

CD mechanism assembly

Flame h

Fix plate (L)

Rear damper bracket Fix arm (L)

Damper

Rear damper bracket

Fix arm (R)

Damper

Fix plate(R)

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