JVC KD-LX50R Bedienungsanleitung

SERVICE MANUAL

CD RECEIVER

No.49562

May. 2000

Printed in Japan

200005(O)

VICTOR COMPANY OF JAPAN, LIMITED

MOBILE ELECTRONICS DIVISION

PERSONAL & MOBILE NETWORK B.U. 10-1,1Chome,Ohwatari-machi,Maebashi-city,Japan

KD-LX50R

(No.49562)

KD-LX50RKD-LX50R

This service manual is printed on 100% recycled paper.

Area Suffix

E ---- Continental Europe

Contents

Safety precaution 1-2

Preventing static electricity 1-3

Instructions 1-4~

Disassembly method 2-1

Maintenance of laser pickup 2-12

Extention cord connectiong method 2-13

Functions of the mechanism under

the service mode 2-16

Flow of functional operation

until TOC read 2-18

Description of major ICs 2-20

Block diagram 2-

Standard schematic diagrams 2-

Printed circuit boards 2-

Parts list 3-1~19

ATT

VCR

KD-LX50R

SOURCE BBE

MODE BAND

DISP

INTLOCALMONOSCM 10789 11 12

RPT RND

OFFSEL

Front bracket

CD mechanism

control board

Damper bracket

CD mechanism ass’y

FD screw

Feed motor ass’y

FD gear Pickup unit

Preventing static electricity

1.Grounding to prevent damage by 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.

2.About the earth processing for the destruction prevention 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.

2-1 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.

2-2 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.

4.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

Conductive material

(conductive sheet) or iron plate

(caption)

Anti-static wrist strap

Soldering

Attention when traverse unit is decomposed

1.Solder is put up before the card wire is removed from connector on

the CD substrate as shown in Figure.

(When the wire is removed without putting up solder, the CD pick-up

assembly might destroy.)

2.Please remove solder after connecting the card wire with

when you install picking up in the substrate.

*Please refer to "Disassembly method" in the text for pick-up and how to

detach the substrate.

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

laserradiation and is equipped with safety switches

whichprevent emission of radiation when the drawer is

open and the safety interlocks have failed or are de

feated. 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 : Invisibie laser radiation

when open and interlock or

defeated.

AVOID DIRECT EXPOSURE TO

BEAM (e)

VARNING : Osynlig laserstrålning är

denna del är öppnad och spårren är

urkopplad. Betrakta ej strålen. (s)

VARO : Avattaessa ja suojalukitus

ohitettaessa olet alttiina

näkymättömälle lasersäteilylle.Älä

katso säteeseen. (d)

ADVARSEL :Usynlig laserstråling

ved åbning , når

sikkerhedsafbrydere er ude af

funktion. Undgå udsættelse 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.

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 screws 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.

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

Top chassis

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 H attaching the main

board assembly to the bottom cover on the upper

side of the body.

Remove the screw I 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 a. (At this point, the main board can be

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

Remove the screw J and the two screws K

attaching the rear heat sink on the back of the body.

Remove the three screws L and the screw M

attaching the rear panel. Now, the main board

assembly will be removed.

Removing the main board assembly

(See Fig.6 and 7)

when reassembling, correctly engage

the switch S561 and S562 on the main

board with the part e of the operation

assembly (Refer to Fig.6-2,17 and 18).

ATTENTION:

Fig.6-1

Fig.7

Fig.6-2

CN504

CN701

Front panel assembly

CN702

CN503

S652

Main board S651

Rear panel

Rear heat sink

Joint a Joint a

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 N attaching the front panel

assembly on both sides of the body. Remove the

front panel toward the front.

Removing the front panel assembly

(See Fig.8,9 and 10)

Prior to performing the following procedure, remove

the top chassis assembly and the front panel

assembly.

Remove the four screws O attaching the front board

on the back of the front panel assembly and release

the eight joints b.

Removing the Front Board (See Fig.11)

Fig.8

Fig.9

Fig.10

Fig.11

CN701

Front panel assembly

CN701

Front panel assembly

Joints b

Prior to performing the following procedure, remove

the top chassis assembly and the front panel

assembly.

Disconnect the harness from connector CN503 and

CN504 on the main board.

Remove the four screws P and detach the lifter unit

from the bottom cover.

Removing the lifter unit (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 Q attaching the feed motor

(L).

Removing the feed motor (L) (See Fig.13)

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 R attaching the feed motor

(R).

Removing the feed motor (R) (See Fig.14) Clutch assembly

Fig.12

Lifter unit assembly

CN504

CN503

Fig.13

Fig.14

Lifter unit assembly

Feed motor (L) assembly

Washer Q

Clutch assembly

Washer

Feed motor (R) assembly

Lifter unit assembly

Prior to performing the following procedure, remove

the top chassis assembly, the front panel assembly

and the lifer unit.

Remove the screws S 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.

Disconnect the card wire from connector CN702 on

the main board and remove the operation assembly.

Removing the operation assembly

(See Fig.15 to 18)

when reassembling, correctly engage

the switch S561 and S562 on the main

board and the right gear with the part e

of the operation assembly.

ATTENTION: Fig.15

Fig.16

Fig.17Fig.18

Spring 6

CN702

Operation assembly

Spring 5

Operation assembly e

S652

S651

Operation assembly

Operation assembly e

S652 S651

Bracket (R) Bracket (L)

Bracket (R)

Prior to performing the following procedure, remove

the operation assembly.

Remove the six screws T attaching 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.19 and 20)

Prior to performing the following procedure, remove

the top chassis.

Remove the three screws U and the CD mechanism

assembly from the top chassis.

Removing the CD mechanism assembly

(See Fig.21)

Button panel

Operation switch board

Button panel

CD mechanism assembly

Fig.19

Fig.20

Fig.21

Remove the two screws A on both sides of the body

and detach the top cover upward.

Remove the two screws B and the two screws C

attaching the voice board.

Remove upward the bushing attaching the cord.

Remove the main board from the base chassis while

detaching the pin jack.

Disconnect the sub board from connector CN851 on

the main board.

Disconnect the harness from connector CN852 on

the main board. Then disconnect the cord from the

main board.

Disassembly method

Removing the voice recorder

(See Fig.1 to 3)

Fig.1

Fig.2

Fig.3

Top cover

Bushing

Pin jack

Voice board

Voice board Sub board

CN852

CN851

Cord

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