JVC KD-SX8250 Bedienungsanleitung

SERVICE MANUAL

CD RECEIVER

No.49690

Feb. 2002

KD-SX8250/KD-SX780

Area Suffix

J Northern America

Detachable

COMPACT

DIGITAL AUDIO

KD-SX780

SOUND

VOL VOL

SOURCE

KD-SX8250

SOUND

VOL VOL

SOURCE

Contents

Safety precaution

Preventing static electricity

Disassembly method

Adjustment method

1-2

1-3

1-4

1-18

Flow of functional

operation unit TOC read

Maintenance of laser pickup

Replacement of laser pickup

Description of major ICs

1-19

1-21

1-22

SUBWOOFER

LINE-OUT 4V 2V

DIMMER

FINDER SILVER BLACK

Difference point KD-SX8250 KD-SX780

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1-2

KD-SX8250/KD-SX780

CAUTION

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

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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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.

1.1. 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.

1.1.1. 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.

1.1.2. Ground yourself

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

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.

1.2. 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

Conductive material

(conductive sheet) or iron plate

(caption)

Anti-static wrist strap

Shorted part

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1-4

KD-SX8250/KD-SX780

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 Bon 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 to 4)

Remove the four screws B 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 nine screws C attaching the rear panel

and one screw D 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 E attaching the main

amplifier board assembly on the top cover.

Disconnect connector CN501 on the main amplifier

board assembly from the cassette mechanism

assembly.

Removing the main amplifier board assembly

(See Fig.8)

Bottom cover

Fig. 6

Fig. 7

Fig. 8

Main board assembly

Joints d

Joints e

Joint f

C C

Rear panel

CN501

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KD-SX8250/KD-SX780

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 Fattaching the cassette

mechanism assembly from the top cover.

Removing the CD mechanism assembly

(See Fig.9)

Removing the (LCD & key) control switch

board (See Fig.10 to 12)

Prior to performing the following procedure, remove

the front panel assembly.

Remove the four screws Gattaching the rear cover

on the back of the front panel assembly.

Unjoint the nine joints gwith the front panel and the

rear cover.

Remove the control switch board on the back of the

front panel.

CD mechanism assembly

FTop cover

Fig. 9

Fig. 10

Fig. 12

Fig. 11

LCD & Key control board

Joints g

Joints g Joints g

Joints g

Front panel

Rear cover

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KD-SX8250/KD-SX780

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

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KD-SX8250/KD-SX780

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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KD-SX8250/KD-SX780

Prior to performing the following procedure, remove

the top cover, the connector board and the chassis

unit.

Remove the screw Cand move the loading / feed

motor assembly in the direction of the arrow to

remove it from the chassis rivet assembly.

Disconnect the wire from the loading / feed motor

assembly if necessary.

Removing the loading / feed motor

assembly (See Fig.11 and 12)

Prior to performing the following procedure, remove

the top cover.

Remove the clamper arm spring.

Move the clamper assembly in the direction of the

arrow to release the two joints d.

Removing the clamper assembly

(See Fig.9 and 10)

When reassembling, connect the wire

from the loading / feed motor assembly

to the flame as shown in Fig.11.

CAUTION:

Fig.9

Fig.10

Fig.12Fig.11

Clamper arm

spring

Clamper arm spring

Chassis rivet

assembly

Joint d

Joint d Clamper assembly

Clamper assembly

Joint d

Chassis rivet assembly

Loading / feed motor assembly

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Reattach the feed rack to the pickup unit using the

screw F.

Reattach the feed sw. holder to the feed rack while

setting the joint tab gto the slot of the feed rack and

setting the part fof the feed rack to the switch of the

feed sw. holder correctly.

As the feed sw. holder is temporarily attached to the

pickup unit, set to the gear of the joint gand to the

bending part of the chassis (joint h) at a time.

Reattach the feed sw. holder using the screw E.

Reattach the shaft to the pickup unit. Reattach the

pu. shaft holder to the shaft using the screw D.

Reattaching the pickup unit

(See Fig.13 to 16)

Prior to performing the following procedure, remove

the top cover, the connector board and the chassis

unit.

Remove the screw Dand pull out the pu. shaft

holder from the shaft.

Remove the screw Eattaching the feed sw. holder.

Move the part eof the pickup unit upward with the

shaft and the feed sw. holder, then release the joint f

of the feed sw. holder in the direction of the arrow.

The joint gof the pickup unit and the feed rack is

released, and the feed sw. holder comes off.

Remove the shaft from the pickup unit.

Remove the screw Fattaching the feed rack to the

pickup unit.

Removing the pickup unit

(See Fig.13 to 17)

Make sure that the part ion the underside

of the feed rack is certainly inserted to the

slot jof the change lock lever.

CAUTION:

Fig.13

Fig.14

Fig.15

Fig.17Fig.16

Feed sw. holder

Joint f

Joint g

Joint f

Joint e

Pickup unit

Pu. shaft holder

Shaft

Feed rack

Pickup unit

Feed sw. holder

Pickup unit

Feed rack

Pickup unit

Joint h

Part i

Slot j

Joint g

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