JVC KD-LX333 Service Manual

SERVICE MANUAL

CD RECEIVER

KD-LX333

Contents

Safety precaution Preventing static electricity Disassembly method Adjustment method

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Flow of finctional operation intil opelation until TOC read Maintenance of laser pickup Replacement of laser pickup Description of Major ICs

Area Suffix

J Northern America

1-14 1-16 1-16 1-17~33

No.49722

Jun. 2002

KD-LX333

Safety precaution

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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KD-LX333

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.

(caption) Anti-static wrist strap

Conductive material (conductive sheet) or iron plate

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

CD mechanism ass’y

Damper bracket

Front bracket

CD mechanism control board

Feed motor ass’y

FD gear

FD screw

Soldering

Pickup unit

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KD-LX333

Disassembly method

Removing the top chassis

(See Fig.1 to 5)

Remove the two screws A attaching the bottom cover to the top chassis on the bottom of the body.

Remove the two screws B attaching the top chassis on both sides of the body.

Remove the two screws C and the two screw D attaching the heat sink on the left side of the body.

Remove the two screws E and the screw F on the back of the body.

Remove the two screws G on 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.

Bottom cover

Fig.1

Top chassis

Fig.2

Fig.4

Heat sink

Top chassis

Fig.3

Top chassis

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Fig.5

Removing the front panel assembly

(See Fig.6 to 8)

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 H attaching the front panel assembly on both sides of the body. Remove the front panel toward the front.

KD-LX333

CN701

Front panel assembly

Fig.6

Front panel assembly

Fig.7

CN701

Fig.8

Removing the Front Board (See Fig.9)

Prior to performing the following procedure, remove the top chassis assembly and the front panel assembly.

Remove the four screws I attaching the front board on the back of the front panel assembly and release the eight joints a.

Joints a

Fig.9

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Removing the lifter unit (See Fig.10)

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 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 K attaching the feed motor (L).

CN503

CN504

Lifter unit assembly

Fig.10

Lifter unit assembly

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

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 L attaching the feed motor (R).

Clutch assembly

Washer

Clutch assembly

Feed motor (L) assembly

Fig.11

Lifter unit assembly

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Washer

Feed motor (R) assembly

Fig.12

Removing the operation assembly

(See Fig.13 to 16)

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 M attaching 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.

ATTENTION:

When reassembling, correctly engage the switch S651 and S652 on the main board and the right gear with the part b of the operation assembly.

Bracket (L)

Spring 5

Operation assembly

Fig.13

KD-LX333

Bracket (R)

Spring 6

CN702

Bracket (R)

Operation assembly b

S652

S651

Operation assembly b

Fig.14

Operation assembly

S652

S651

Fig.15Fig.16

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Removing the operation switch board

(See Fig.17 and 18)

Prior to performing the following procedure, remove the operation assembly.

Remove the six screws N attaching the button panel on the operation assembly.

Pull out the operation switch board from inside of the button panel.

Button panel

Fig.17

Operation switch board

Button panel

Removing the CD mechanism assembly

(See Fig.19)

Prior to performing the following procedure, remove the top chassis.

Remove the three screws O and the CD mechanism assembly from the top chassis.

Fig.18

CD mechanism assembly

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Fig.19

Removing the main board assembly

(See Fig.20 to 22)

Prior to performing the following procedure, remove the top chassis.

KD-LX333

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 P attaching the main board assembly to the bottom cover on the upper side of the body.

Remove the screw Q attaching 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 R attaching the rear heat sink on the back of the body.

Remove the two screws S and the screw T attaching the rear panel. Now, the main board assembly will be removed.

ATTENTION:

When reassembling, correctly engage the switch S651 and S652 on the main board and the right gear with the part b of the operation assembly (Refer to Fig.21).

CN503

Joint c

CN702

CN504

CN701

Joint c

Front panel assembly

Fig.20

Main board

Rear panel

S652

Fig.21

Fig.22

S651

Rear heat sink

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KD-LX333

Removing the CD mechanism control board (See Fig.1 and 2)

Unsolder the part a and b on 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 A attaching 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 d and the front bracket slot e.

Disconnect the flexible wire from connector on the pickup unit.

ATTENTION:

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)

CD mechanism assembly

Front bracket

Pickup unit

Damper bracket

Fig.1

Flexible wire

CD mechanism control board

Shift the lock

Removing the loading motor

(See Fig.3 to 5)

Prior to performing the following procedure, remove the CD mechanism control board.

Remove the two springs f attaching the CD mechanism assembly and the front bracket.

Remove the two screws B and the front bracket while pulling the flame outward.

Remove the belt and the screw C from the loading motor.

Loading motor

FD gear

Loading motor

Pull outward

Fig.2

CD mechanism control board

Front bracket

Fig.3

Front bracket

Pull outward

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Fig.5

Belt

Flame

Fig.4

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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 motor).

Remove the three screws D and the damper bracket.

Raise the both sides fix arms and move the fix plates in the direction of the arrow to place the four shafts g as shown in Fig.8 and 9.

Remove the CD mechanism assembly and the two springs h attaching the flame.

Remove the two screws E and both sides rear damper brackets from the dampers. Detach the CD mechanism assembly 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.

CD mechanism

Front bracket

CD mechanism

Flame

assembly

Damper bracket

Fig.5

Damper bracket

Fig.6

CD mechanism control board

Fix plate (L)

Fix arm (R)

Fig.7

Rear damper bracket

Fig.8

Rear damper bracket

Fix plate(R)

Fix arm (L)

Damper

Fig.9

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