JVC KD-LX333 Bedienungsanleitung

SERVICE MANUAL

CD RECEIVER

No.49722

Jun. 2002

KD-LX333

Area Suffix

J Northern America

Contents

Safety precaution

Preventing static electricity

Disassembly method

Adjustment method

1-2

1-3

1-4

1-13

1-14

1-16

1-17~33

Flow of finctional operation intil opelation

until TOC read

Maintenance of laser pickup

Replacement of laser pickup

Description of Major ICs

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1-2

!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.

Safety precaution

!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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1-3

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.

Grounding to prevent damage by static electricity

Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as mechanism unit.

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

1. 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.)

2. 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.

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

(caption)

Anti-static wrist strap

Conductive material

(conductive sheet) or iron plate

Front bracket

CD mechanism

control board

Damper bracket

CD mechanism ass’y

FD screw

Feed motor ass’y

FD gear Pickup unit

Soldering

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1-4

Remove the two screws Aattaching the bottom

cover to the top chassis on the bottom of the body.

Remove the two screws Battaching the top chassis

on both sides of the body.

Remove the two screws Cand the two screw D

attaching the heat sink on the left side of the body.

Remove the two screws Eand the screw Fon the

back of the body.

Remove the two screws Gon the upper side of the

body.

Move the top chassis upward and disconnect the CD

mechanism connector from the main board

connector by pulling it. Remove the top chassis from

the body.

Disassembly method

Removing the top chassis(See Fig.1 to 5)

Fig.1

Fig.2

Fig.3

Fig.4

Fig.5

Bottom cover

Top chassis

Heat sink

EFTop chassis

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1-5

Prior to performing the following procedure, remove

the top chassis assembly.

Disconnect the flexible harness from connector

CN701 on the main board assembly.

Remove the four screws Hattaching the front panel

assembly on both sides of the body. Remove the

front panel toward the front.

Removing the front panel assembly

(See Fig.6 to 8)

Prior to performing the following procedure, remove

the top chassis assembly and the front panel

assembly.

Remove the four screws Iattaching the front board

on the back of the front panel assembly and release

the eight joints a.

Removing the Front Board (See Fig.9)

Fig.6

Fig.8

Fig.7

Fig.9

Front panel assembly

Joints a

CN701

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1-6

Prior to performing the following procedure, remove

the top chassis assembly and the front panel

assembly.

Disconnect the harness from connector CN503and

CN504 on the main board.

Remove the four screws J and detach the lifter unit

from the bottom cover.

Removing the lifter unit (See Fig.10)

Prior to performing the following procedure, remove

the lifter unit.

Remove the washer attaching the clutch assembly

and detach the clutch assembly from the shaft of the

lifter unit.

Remove the two screws Kattaching the feed motor

(L).

Removing the feed motor (L) (See Fig.11)

Prior to performing the following procedure, remove

the lifter unit.

Remove the washer attaching the clutch assembly

and detach the clutch assembly from the shaft of the

lifter unit.

Remove the two screws Lattaching the feed motor

(R).

Removing the feed motor (R) (See Fig.12)

Clutch assembly

Fig.10

Lifter unit assembly

CN504

CN503

Fig.11

Fig.12

Lifter unit assembly

Feed motor (L) assembly

Washer K

Clutch assembly

Washer

Feed motor (R) assembly

Lifter unit assembly

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1-7

Prior to performing the following procedure, remove

the top chassis assembly, the front panel assembly

and the lifer unit.

Disconnect the card wire from connector CN702 on

the main board and remove the operation assembly.

Remove the three screws Mattaching the right and

left brackets which fix gears on both sides of the

operation assembly.

Remove the springs 5 and 6 from the operation

assembly.

Removing the operation assembly

(See Fig.13 to 16)

When reassembling, correctly engage

the switch S651 and S652 on the

main board and the right gear with

the part bof the operation assembly.

ATTENTION: Fig.13

Fig.14

Fig.15Fig.16

Spring 6

CN702

Operation assembly

Spring 5

Operation assembly b

S652

S651

Operation assembly

Operation assembly b

S652 S651

Bracket (L) Bracket (R)

Bracket (R)

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1-8

Prior to performing the following procedure, remove

the operation assembly.

Remove the six screws Nattaching the button panel

on the operation assembly.

Pull out the operation switch board from inside of the

button panel.

Removing the operation switch board

(See Fig.17 and 18)

Prior to performing the following procedure, remove

the top chassis.

Remove the three screws Oand the CD mechanism

assembly from the top chassis.

Removing the CD mechanism assembly

(See Fig.19)

Button panel

Operation switch board

Button panel

CD mechanism assembly

Fig.17

Fig.18

Fig.19

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1-9

Prior to performing the following procedure, remove

the top chassis.

Disconnect the flexible harness from connector

CN701, the card wire from CN702 on the main board

and the harness from CN503 and CN504

respectively.

Remove the three screws Pattaching the main

board assembly to the bottom cover on the upper

side of the body.

Remove the screw Qattaching the rear panel and

the bottom cover on the back of the body. Move the

main board in the direction of the arrow and release

the two joints c. (At this point, the main board can be

removed with the rear panel and the rear heat sink.)

Remove the three screws Rattaching the rear heat

sink on the back of the body.

Remove the two screws Sand the screw T

attaching the rear panel. Now, the main board

assembly will be removed.

Removing the main board assembly

(See Fig.20 to 22)

When reassembling, correctly engage

the switch S651 and S652 on the

main board and the right gear with

the part bof the operation assembly

(Refer to Fig.21).

ATTENTION:

Fig.20

Fig.22

Fig.21

CN504

CN701

Front panel assembly

CN702

CN503

S652

Main board S651

Rear panel Rear heat sink

Joint c Joint c

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1-10

Unsolder the part aand bon the CD mechanism

control board.

Remove the stator fixing the CD mechanism control

board and the damper bracket (To remove the stator

smoothly, pick up the center part).

Remove the screw Aattaching the CD mechanism

control board.

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.

Disconnect the flexible wire from connector on the

pickup unit.

Removing the CD mechanism control

board (See Fig.1 and 2)

Turn the FD gear in the direction of the

arrow to move the entire pickup unit to

the appropriate position where the

flexible wire of the CD mechanism unit

can be disconnected easily.

(Refer to Fig.2)

ATTENTION:

Prior to performing the following procedure, remove

the CD mechanism control board.

Remove the two springs fattaching the CD

mechanism assembly and the front bracket.

Remove the two screws Band the front bracket

while pulling the flame outward.

Remove the belt and the screw Cfrom the loading

motor.

Removing the loading motor

(See Fig.3 to 5)

Fig.2

Fig.3

Fig.4

Shift the lock

Flexible wire

Pickup unit

FD gear

CD mechanism control board

Loading motor Front bracket

Front bracket Pull outward

Pull outward

Flame

Fig.5

Loading motor

Belt

Fig.1

Front bracket CD mechanism

control board

Damper bracket

CD mechanism assembly

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