JVC KD-LH7R Bedienungsanleitung

SERVICE MANUAL

CD RECEIVER

No.49724

Apr. 2002

KD-LH7R

Area Suffix

E ---- Continental Europe

EX ------- Central Europe

Contents

Safety precaution

Preventing static electricity

Important for laser products

Disassembly method

Adjustment method

1-2

1-3

1-4

1-5

1-20

Flow of functional

operation unit TOC read

Maintenance of laser pickup

Replacement of laser pickup

Description of major ICs

1-21

1-23

1-24

SOUND

VOL VOL

SOURCE

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!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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Conductive material

(conductive sheet) or iron plate

(caption)

Anti-static wrist strap

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. 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

1.1.3. 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.

1.1.2. Ground yourself

1. Use an anti-static wrist strap to release any static electricity built up in your body.

1.1.1. Ground the workbench

1. 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.

1.1. 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.

Connector board

DET switch

Pickup Pickup

Short-circuit

Joints b

Short-circuit point

(Soldering)

Flexible wire

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Important for laser products

1.CLASS 1 LASER PRODUCT

2.DANGER : Invisible laser radiation when open and inter lock

failed or defeated. Avoid direct exposure to beam.

3.CAUTION : There are no serviceable parts inside the

Laser Unit. Do not disassemble the Laser Unit. Replace the

complete Laser Unit if it malfunctions.

4.CAUTION : The compact disc player uses invisible laser

radiation and is equipped with safety switches which prevent

emission of radiation when the drawer is open and the safety

interlocks have failed or are defeated.

It is dangerous to defeat the safety switches.

5.CAUTION : If safety switches malfunction, the laser is able

to function.

6.CAUTION : Use of controls, adjustments or performance of

procedures other than those specified herein may result in

hazardous radiation exposure.

VARNING : Osynlig laserstrålning är denna del är öppnad

och spårren är urkopplad. Betrakta ej strålen.

VARO : Avattaessa ja suojalukitus ohitettaessa olet

alttiina näkymättömälle lasersäteilylle.Älä katso

säteeseen.

ADVARSEL : Usynlig laserstråling ved åbning , når

sikkerhedsafbrydere er ude af funktion. Undgå

udsættelse for stråling.

ADVARSEL : Usynlig laserstråling ved åpning,når

sikkerhetsbryteren er avslott. unngå utsettelse

for stråling.

REPRODUCTION AND POSITION OF LABELS

WARNING LABEL

DANGER : Invisible laser

radiation when open and

interlock or defeated.

AVOID DIRECT EXPOSURE

TO BEAM (e)

VARNING : Osynlig laser-

strålning är denna del

är öppnad och spårren är

urkopplad. Betrakta ej

strålen. (s)

VARO : Avattaessa ja suo-

jalukitus ohitettaessa olet

alttiina näkymättömälle

lasersäteilylle.Älä katso

säteeseen. (d)

ADVARSEL :Usynlig laser-

stråling ved åbning , når

sikkerhedsafbrydere er ude

af funktion. Undgå udsæt

telse for stråling. (f)

CLASS 1

LASER PRODUCT

CAUTION

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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Press the release switch and remove the front panel

unit in the direction of the arrow.

Disassembly method

Removing the front panel unit (See Fig.1)

Remove the two screws Aattaching the front

chassis.

Remove the two screws B on each side of the body.

Release the two joints aand the two joints bon the

sides. Release the two joints cat the bottom and

remove the front chassis toward the front.

Removing the front chassis

(See Fig.2 ~ 4)

Remove the four screws C attaching the heat sink

on the left side of the body, and remove the heat

sink.

Removing the heat sink (See Fig.5)

Joint c

Heat sink

Fig.2

Fig.1

Fig. 3

Fig.4

Fig. 5

Front panel unit

Front chassis

Joint a

Joint a Joint b

Joint b

Joint c

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Prior to performing the following procedure, remove

the front chassis and the heat sink.

Turn the body upside down.

Insert a screwdriver to the two joints dand two joints

eon both sides of the body and the joint fon the

back of the body, then detach the bottom cover from

the body.

Removing the bottom cover (See Fig.6)

Prior to performing the following procedure, remove

the front chassis, the heat sink and bottom cover.

Remove the six screws D attaching the rear panel

and one screw E attaching the pine jack on the back

of the body.

Removing the rear panel (See Fig.7 )

Prior to performing the following procedure, remove

the front chassis, the heat sink, bottom cover and the

rear panel.

Remove the two screws Fattaching the main

amplifier board assembly on the top cover.

Disconnect connector CN101 on the main amplifier

board assembly from the cassette mechanism

assembly.

Removing the main amplifier board assembly

(See Fig.8)

When disengaging the joint fusing a

screwdriver, do not damage or break the

board.

CAUTION:

Bottom cover

Fig. 6

Fig. 7

Fig. 8

Main board assembly

Joint d

Joint e

Joint f

Rear panel

CN101

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Prior to performing the following procedure, remove

the top cover.

Disconnect the wire from connector CN601 on the

MP3 board.

Remove the five screws Gand the MP3 board,

releasing the joint gand h.

Removing the MP3 board (See Fig.9)

Prior to performing the following procedure, remove

the front chassis, the heat sink, bottom cover and the

main amplifier board assembly.

Remove the three screws H attaching the cassette

mechanism assembly from the top cover.

Removing the CD mechanism assembly

(See Fig.10)

Fig.9

CN601

CD mechanism assembly

Top cover

Fig. 10

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Removing the (LCD & key) control switch

board (See Fig.11 ~ 13)

Prior to performing the following procedure, remove

the front panel assembly.

Remove the four screws Iattaching the rear cover

on the back of the front panel assembly.

Unjoint the nine joints iwith the front panel and the

rear cover.

Remove the control switch board on the back of the

front panel.

Fig. 11

Fig. 13

Fig. 12

LCD & Key control board

Joint i

Joint i Joint i

Joint i

Front panel

Rear cover

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Remove the two screws Aon each side of the body.

Lift the front side of the top cover and move the

cover backward to release the two joints a.

Removing the top cover (See Fig.1 and 2)

Remove the screw Bfixing the connector board.

Solder the short-circuit point on the connector board.

Disconnect the flexible wire from the pickup.

Move the connector board in the direction of the

arrow to release the two joints b.

Unsolder the wire on the connector board if

necessary.

Removing the connector board

(See Fig.3 to 5)

Before disconnecting the flexible wire

from the pickup, solder the short-circuit

point on the pickup. No observance of

this instruction may cause damage of

the pickup.

CAUTION:

Unsolder the short-circuit point after

reassembling.

CAUTION:

Fig.1

Fig.2

Fig.3

Fig.4Fig.5

Joints a

Top cover

Connector board

DET switch

Pickup

Short-circuit

Joints b

Short-circuit point

(Soldering)

Flexible wire

Connector board

Frame

< CD mechanism section >

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Extend the two tabs cof the feed sw. holder and pull

out the switch.

Unsolder the DET switch wire if necessary.

Removing the DET switch

(See Fig.3 and 6)

Prior to performing the following procedure, remove

the top cover and the connector board.

Remove the two suspension springs (L) and (R)

attaching the chassis unit to the frame.

Removing the chassis unit

(See Fig.7 and 8)

The shape of the suspension spring (L)

and (R) are different. Handle them with

care.

CAUTION:

When reassembling, make sure that the

three shafts on the underside of the

chassis unit are inserted to the dampers

certainly.

CAUTION:

Fig.3

Fig.6

Fig.8Fig.7

Connector board

DET switch

Pickup

Short-circuit

Joints b

Tab c

Feed sw. holder

Tab c

Suspension spring (L)

Suspension spring (R)

Chassis unit

Frame

Shafts

Shaft

Damper

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