JVC KD-S845 Bedienungsanleitung

SERVICE MANUAL

2003/5

CD RECEIVER

4985820035KD-S845

TABLE OF CONTENTS

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

2 Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3 Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4 Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

45Wx4

TU N

SCM

RND

RPT

KD-S845

U ------- Other Areas

Area Suffix

1-2 (No.49858)

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.

(No.49858)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 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

1-4 (No.49858)

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 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 3)

• Prior to performing the following procedure, remove the front

panel assembly.

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

the main body.

(2) 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.

Fig.2

Fig.3

Front panel assembly

Eject button

Joint

Front chassis assembly

Joint

Front chassis assembly

Joint cJoint c

(No.49858)1-5

2.1.3 Removing the heat sink

(See Fig.4)

(1) Remove the three screws Aon the left side of the main

body.

Fig.4

2.1.4 Removing the bottom cover

(See Figs.5 and 6)

• Prior to performing the following procedure, remove the front

panel assembly, front chassis assembly and heat sink.

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

joints eand joint f.

CAUTION:

Do not damage the main board when releasing the joint fusing

a screwdriver. (See Figs.5 and 6)

Fig.5

Fig.6

Heat sink

Joint d

Joint e

Joint f

Bottom cover

Rear panel

Joint e

Joint d

Joint f

Rear panel

Bottom cover

1-6 (No.49858)

2.1.5 Removing the rear bracket

(See Fig.7)

• Prior to performing the following procedure, remove the front

panel assembly, front chassis assembly, heat sink and bottom

cover.

(1) Remove the one screws B, for screws Cand three screws

Don the back side of the main body.

(2) Remove the rear bracket.

Fig.7

2.1.6 Removing the main board

(See Fig.8)

• 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 Eattaching the main board.

(2) Disconnect the connector CN501 and remove the main

board.

Fig.8

2.1.7 Removing the CD mechanism assembly

(See Fig. 9)

• Prior to performing the following procedure, remove the front

panel assembly, front chassis assembly, heat sink, bottom

cover, rear bracket, main board and CD mecha board.

(1) Remove the three screws F.

Fig.9

Rear bracket

Main board assembly

CN501

CD mechanism section

Top chassis

(No.49858)1-7

2.1.8 Removing the front board

(See Figs. 10 to 12)

• Prior to performing the following procedure, remove the front

panel assembly.

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

panel assembly.

(2) Release the ten joints g.

(3) Take out the front board.

Fig.10

Fig.11

Fig.12

Joint g

Rear cover

Front panel

Joint g

Front board

1-8 (No.49858)

2.2 CD mechanism section

2.2.1 Removing the CD mechanism control board

(See Fig.1 and 2)

(1) Unsolder the part a and bon the CD mechanism control

board.

(2) Remove the stator fixing the CD mechanism control board

and the damper bracket (To remove the stator smoothly,

pick up the center part).

(3) Remove the screw Aattaching the CD mechanism control

board.

(4) 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.

(5) Disconnect the flexible wire from connector on the pickup

unit.

ATTENTION:

Turn the FD gear in the direction of the arrow to move the en-

tire pickup unit to the appropriate position where the flexible

wire of the CD mechanism unit can be disconnected easi-

ly.(Refer to Fig.2)

Fig.1

Fig.2

Front bracket

CD mechanism

control board

Damper bracket

CD mechanism assembly

Shift the lock

Flexible wire

Pickup unit

FD gear

(No.49858)1-9

2.2.2 Removing the loading motor

(See Fig.3 to 5)

• Rrior to performing the following procedure, remove the CD

mechanism control board.

(1) Remove the two springs fattaching the CD mechanism as-

sembly and the front bracket.

(2) Remove the two screws Band the front bracket while pull-

ing the flame outward.

(3) Remove the belt and the screw Cfrom the loading motor.

Fig.3

Fig.4

Fig.5

CD mechanism control board

Loading motor Front bracket

Front bracket

Pull outward Pull outward

Flame

Loading motor

Belt

1-10 (No.49858)

2.2.3 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 mo-

tor).

(1) Remove the three screws Dand the damper bracket.

(2) Raise the both sides fix arms and move the fix plates in the

direction of the arrow to place the four shafts gas shown in

Fig.8 and 9.

(3) Remove the CD mechanism assembly and the two springs

hattaching the flame.

(4) Remove the two screws Eand both sides rear damper

brackets from the dampers. Detach the CD mechanism as-

sembly 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.

Fig.6

Fig.7

Fig.8

Fig.9

Damper bracket

CD mechanism assembly

Flame h

Fix plate (L)

Rear damper bracket

Fix arm (L)

Damper

Fig.9

Rear damper bracket

Fix arm (R)

Damper

Fix plate(R)

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