JVC KD-SC800R Bedienungsanleitung

SERVICE MANUAL

2003/04

KD-SC800R

CD RECEIVER

49820200304

KD-SC800R

TABLE OF CONTENTS

1 Important Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

2 Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

3 Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24

4 Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28

COMPACT

DIGITAL AUDIO

Area Suffix

E ------------ Continental Europe

EX --------------- Central Europe

KD-SC800R

1-2 (No.49820)

SECTION 1

Important Safety Precautions

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.

KD-SC800R

(No.49820)1-3

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 DVD 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) I t 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 CDpickup 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

Pickup

Short-circuit point

(Soldering)

Flexible wire

Pickup

Short-circuit point

KD-SC800R

1-4 (No.49820)

SECTION 2

Disassembly method

2.1 Main body

2.1.1 Removing the front panel assembly

(See Fig.1)

(1) Push the detach button in the lower left part of the front

panel assembly and remove the front panel assembly in

the direction of the arrow.

Fig.1

2.1.2 Removing the front chassis assembly

(See Figs.2 to 4)

• Prior to performing the following procedure, remove the front

panel assembly.

(1) Remove the screw Aon the both sides of the main body.

(2) Remove the two screws Bon the front side of the main

body.

(3) Release the two joints aand two joints bon both sides of

the main body using a screwdriver, and remove the front

chassis assembly forward.

(4) Release the two joints con the bottom side of the main

body and remove the front chassis assembly in the direc-

tion of the arrow.(see Figs.3)

Fig.2

Fig.3

Fig.4

Front panel assembly

Detach button

Joint a

Front chassis assembly

Joint b

Front chassis assembl

Joint cJoint c

KD-SC800R

(No.49820)1-5

2.1.3 Removing the heat sink

(See Fig.5)

(1) Remove the two screws Cand one screws Don the left

side of the main body.

Fig.5

2.1.4 Removing the bottom cover

(See Figs.6 and 7)

• Prior to performing the following procedure, remove the front

panel assembly, front chassis assembly and heat sink.

(1) Turn over the body and release the two joints d, two joints

eand joint f.

CAUTION:

Do not damage the main board when releasing the joint dus-

ing a screwdriver. (See Figs.6 and 7)

Fig.6

Fig.7

DHeat sink

Joint d

Joint e

Joint f

Bottom cover

Joint e

Joint d

Joint f

Bottom cover

KD-SC800R

1-6 (No.49820)

2.1.5 Removing the rear bracket

(See Fig.8)

• Prior to performing the following procedure, remove the front

panel assembly, front chassis assembly, heat sink and bottom

cover.

(1) Remove the three screws E, one screws Fand two screws

Gon the back of the body.

(2) Remove the rear bracket.

Fig.8

2.1.6 Removing the main board

(See Fig.9)

• Prior to performing the following procedure, remove the front

panel assembly, front chassis assembly, heat sink, bottom

cover and rear bracket.

(1) Remove the two screws Hattaching the main board.

(2) Disconnect connector CN501 and remove the main board.

Fig.9

2.1.7 Removing the CD mechanism assembly

(See Fig.10)

• Prior to performing the following procedure, remove the front

panel assembly, front chassis assembly, heat sink, bottom

cover, rear bracket and main board.

(1) Remove the three screws J.

Fig.10

Rear bracket G

Insert Subwoofer and steering

cables into the slots.

Main board

CN501

CD mechanism assembly Top chassis

KD-SC800R

(No.49820)1-7

2.1.8 Removing the front board

(See Figs.11 to 13)

• Prior to performing the following procedure, remove the front

panel assembly.

(1) Remove the four screws Kon the back side of the front

panel assembly.

(2) Release the ten joints g.

(3) Take out the front board.

Fig.11

Fig.12

Fig.13

Joint g

Front board

KD-SC800R

1-8 (No.49820)

2.2 CD Mechanism Assembly

2.2.1 Removing the top cover

(See Figs.1 and 2)

(1) Remove the two screws Aon the both side of the body.

(2) Lift the front side of the top cover and move the top cover

backward to release the two joints a.

Fig.1

Fig.2

Joints a

Top cover

Joints a

Top cover

KD-SC800R

(No.49820)1-9

2.2.2 Removing the connector board

(See Figs.3 to 5)

CAUTION:

Before disconnecting the flexible wire from the pickup, solder

the short-circuit point on the pickup. No observance of this in-

struction may cause damage of the pickup.

(1) Remove the screw Bfixing the connector board.

(2) Solder the short-circuit point on the connector board.

(3) Disconnect the flexible wire from the pickup.

(4) Move the connector board in the direction of the arrow to

release the two joints b.

(5) Unsolder the wire on the connector board if necessary.

CAUTION:

Unsolder the short-circuit point after reassembling.

Fig.3

Fig.4

Fig.5

Connector board

Pickup

Short-circuit point

Joints b

Wires

Pickup

Short-circuit point

(Soldering)

Flexible wire

Connector board

Frame

KD-SC800R

1-10 (No.49820)

2.2.3 Removing the DET switch

(See Figs.6 and 7)

(1) Extend the two tabs cof the feed sw. holder and pull out

the switch.

(2) Unsolder the DET switch wire if necessary.

Fig.6

Fig.7

Connector

board

DET switch

Pickup

DET switch Tab c

Tab c

DET switch wire

Feed sw. holder

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