JVC KDSX8350 - Service Manual Immediate Download

SERVICE MANUAL

No.49782

2003/02

KD-SX8350

CD RECEIVER

49782

2003

KD-SX8350

TABLE OF CONTENTS

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

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

Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23

Description of major ICs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27

KD-SX8350

INT

RPT

RND

Detachable

SOUND

VOL

SOURCE

ATT

Area Suffix

Northern America

KD-SX8350

1-2 (No.49782)

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-SX8350

(No.49782)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-SX8350

1-4 (No.49782)

SECTION 2

Disassembly method

2.1 Main body

2.1.1

Removing the front panel assembly

(See Fig.1.)

(1) Push the release button and remove the front panel as-

sembly.

Fig.1

2.1.2

Removing the bottom cover

(See fig.2)

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

joints b and the joint c .

Caution:

Do not damage the board when releasing the joint c us-

ing a screwdriver.

Fig.2

Front panel assembly

Release button

Bottom cover

Joint b

Joint c

Joint a

KD-SX8350

(No.49782)1-5

2.1.3 Removing the front chassis assembly

(See fig.3,4)

· Prior to performing the following procedure, remove the front

panel assembly and the bottom cover.

(1) Remove the screws A on the both sides of the body.

(2) Remove the screws B on the front side of the body.

(3) Release the two joints d and the two joints e on the both

sides of the body, using a screwdriver.

Fig.3

Fig.4

2.1.4 Removing the heat sink

(See fig.5)

(1) Remove the two screws C and the two screws D on the left

side oft the body.

Fig.5

2.1.5 Removing the rear panel

(See fig.6)

· Prior to performing the following procedure, remove the front

panel assembly, the front chassis, the heat sink and the bottom

cover.

(1) Remove the three screws E , the three screws F and the

three screws G on the back of the body. Remove the rear

panel.

Fig.6

Joint d

Joint e

Front chassis assembly

Joint d

Joint e

Heat sink