JVC KD-SH909R Service Manual

SERVICE MANUAL

CD RECEIVER

KD-SH909R

Contents

Safety precaution Preventing static electricity Disassembly method Adjustment method

ATT

ANGLE

DAB

PRESET

AUX SEL

RM-RK100

DISC

PRESET

R D

DISC

VOLUME

ATT

Area Suffix

E --------- Continental Europe EX ------------- Central Europe

1-2 1-3 1-4 1-23

Flow of functional operation unit TOC read Maintenance of laser pickup Replacement of laser pickup Description of major ICs

1-24 1-26 1-26 1-27~51

No.49712

Apr. 2002

KD-SH909R

Safety precaution

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.

1-2

KD-SH909R

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.

(caption) Anti-static wrist strap

Conductive material (conductive sheet) or iron plate

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

CD mechanism ass’y

Damper bracket

Attention when traverse unit is decomposed

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

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.

Front bracket

Feed motor ass’y

FD screw

CD mechanism control board

Soldering

FD gear

Pickup unit

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KD-SH909R

Disassembly method

Removing the front panel assembly

(See Fig.1)

Press the release button in the lower right part of the front panel assembly to unlock.

Remove the front panel assembly in the direction of the arrow.

Removing the top chassis

(See Fig.2 to 6)

Turn on power.

Press the eject button in the upper left part of the front panel assembly to move the assembly as shown in Fig.2 and turn off power.

Front panel assembly

Eject button

Release button

Fig.1

Top chassis

Remove the two screws A on the upper side of the body.

Top chassis

Front panel assembly

Fig.2

Fig.3

1-4

Remove the three screws B on both sides of the body.

Remove the screw C and the three screws D on the left side of the body.

Remove the two screws E and the screw F on the back of the body.

Move the top chassis upward and remove it with the CD mechanism assembly. The connector on the CD mechanism assembly is disconnected from connector CN601 on the main board.

KD-SH909R

Top chassis

Fig.4

Top chassis

Removing the (A) board

(See Fig.7)

Prior to performing the following procedure, remove the top cover.

Heat sink

Fig.5

Fig.6

Disconnect the wire from connector CN601on the (A) board.

Remove the five screws G and the (A) board, releasing the joint a and b.

CN601

Fig.7

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KD-SH909R

Removing the CD mechanism assembly

(See Fig.8)

Prior to performing the following procedure, remove the top chassis.

Remove the three screws H inside the top chassis and remove the CD mechanisma ssembly.

Removing the motor assembly

(See Fig.9 to 11)

Prior to performing the following procedure, remove the top chassis.

Disconnect the wire from connector CN703 on the main board.

Remove the motor bracket and the spring attached to the arm braket assembly (R).

Top chassis

Spring

CD mechanisma ssembly

Fig.8

Motor braket

Remove the two screws I attaching the motor bracket.

Remove the washer attaching the clutch assembly and pull out the clutch assembly from the shaft.

Remove the two screws J and the motor assembly from the motor bracket.

Motor braket

Clutch assembly

Motor assembly

Arm braket assembly (R)

Fig.9

Main board

CN703

CN601

Motor braket

1-6

Washer

Fig.11

Fig.10

Removing the main board

(See Fig.12 to 16)

Prior to performing the following procedures, remove the top chassis and the motor bracket.

Disconnect the flexible wire from connector CN701 and CN702 on the main board respectively.

Move the front bracket backward until it stops.

Remove the four screws K attaching the arm brackets (L) and (R). Move the right and arm lefter brackets from the rod gear.

Remove the rod gear.

Remove the screw M attaching the rear panel to the bottom cover on the back of the body.

Arm brackets (L)

CN701

CN702

Main board

Fig.12

KD-SH909R

Arm brackets (R)

Rod gear

Arm brackets (R)

Arm brackets (L)

Main board

Rod gear

Fig.13

Rear panel

Fig.14

Bottom cover

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KD-SH909R

Remove the two screws L and move the main board backwards to release the two joints c. (The main board will be removed with the rear panel and the rear heat sink)

Joint c

Remove the screw N and Q attaching the rear heat sink.

Remove the three screws O and the screw P attaching the rear panel. Remove the main board.

Joint c

Rear panel

Main board

Fig.15

Rear heat sink

Removing the lifter switch board

(See Fig.17)

Prior to performing the following procedures, remove the top chassis, the motor bracket and the main board.

Remove the two screws R attaching the lifter switch board.

Fig.16

Bottom cover

Lifter switch board

1-8

Fig.17

KD-SH909R

Removing the lifter board

(See Fig.18 to 24)

Prior to performing the following procedure, remove the top chassis assembly and thefront panel assembly.

Disconnect the flexible wire from connector CN702 on the main board.

Remove the four screws S attaching the front bracket on both sides of the body.

Push the pin of the joint d on the front of the front bracket to release the lock lever.

Main board

CN702

Front bracket

Fig.18

Front bracket

Joint d

Lock lever

Front bracket

Fig.19

Front bracket

Fig.20Fig.21

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KD-SH909R

Remove the screw T attaching the lifter board cover in the rear of the front bracket.

Release the two joints f while pushing the front side. Move the lifter board cover inthe direction of the arrow and release the eight joints e.

Joint f

Joints e

Lifter board cover

Joints e

Joint f

Remove the two screws U attaching the lifter board on the front of the body.

Joints e

Lifter board

Joint e

Front bracket

Fig.22

Lifter board cover

Fig.23

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Fig.24

KD-SH909R

Prior to performing the following procedure, remove the front panel assembly.

Removing the front board

(See Fig.25 and 26)

Remove the four screws V attaching the rear panel to the front panel assembly.

Release the eleven joints g of the front panel and the rear panel.

Disconnect the wire from connector CN803 on the front board.

If necessary, unsolder the front board.

Removing the volume board

(See Fig.26 and 27)

Line in board

Joint g 11

Front board

Rear panel

Fig.25

Soldering

CN803

Soldering

Volume board

Prior to performing the following procedure, remove the rear panel.

Remove the four screws W attaching the volume board.

Disconnect the volume knob, ring lens and volume ring from the volume board.

If necessary, unsolder the volume board.

Removing the line in board

(See Fig.26 and 28)

Prior to performing the following procedure, remove the rear panel.

Disconnect the wire from connector CN803 on the front board.

Pull out the line in board from the front panel assembly.

Fig.26

Volume board

Volume lens, Volume ring

Rng knob

Fig.27

Line in board

Fig.28

1-11

KD-SH909R

< CD mechanism section >

Removing the top cover

(See Fig.1 and 2)

Remove the two screws A on 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 connector board

(See Fig.3 to 5)

Top cover

Joints a

CAUTION:

Remove the screw B fixing 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.

CAUTION:

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.

Unsolder the short-circuit point after reassembling.

Fig.1

Joints a

Top cover

Fig.2

DET switch

1-12

Flexible wire

Frame

Connector board

Joints b

Flexible wire

Short-circuit

Fig.3

Fig.4Fig.5

Pickup

Short-circuit point

(Soldering)

Pickup

Removing the DET switch

(See Fig.3 and 6)

Extend the two tabs c of the feed sw. holder and pull out the switch.

Unsolder the DET switch wire if necessary.

Removing the chassis unit

(See Fig.7 and 8)

Prior to performing the following procedure, remove the top cover and the connector board.

Connector board

Joints b

Short-circuit

Fig.3

KD-SH909R

DET switch

Pickup

Remove the two suspension springs (L) and (R) attaching the chassis unit to the frame.

CAUTION:

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.

Chassis unit

Suspension spring (R)

Suspension spring (L)

Frame

DET switch

Chassis unit

Tab c

Feed sw. holder

Tab c

Fig.6

Shaft

Suspension spring (R)

Suspension spring (L)

Shafts

Damper

Frame

Fig.8Fig.7

1-13

KD-SH909R

Removing the clamper assembly

(See Fig.9 and 10)

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 loading / feed motor assembly (See Fig.11 and 12)

Prior to performing the following procedure, remove the top cover, the connector board and the chassis unit.

Remove the screw C and move the loading / feed motor assembly in the direction of the arrow to remove it from the chassis rivet assembly.

Clamper arm spring

Joint d

Clamper assembly

Fig.9

Clamper arm spring

Chassis rivet assembly

Joint d

Clamper assembly

Joint d

Disconnect the wire from the loading / feed motor assembly if necessary.

CAUTION:

When reassembling, connect the wire from the loading / feed motor assembly to the flame as shown in Fig.11.

Chassis rivet assembly

Fig.10

Loading / feed motor assembly

1-14

Loading / feed motor assembly

Fig.12Fig.11

KD-SH909R

Removing the pickup unit

(See Fig.13 to 17)

Prior to performing the following procedure, remove the top cover, the connector board and the chassis unit.

Remove the screw D and pull out the pu. shaft holder from the shaft.

Remove the screw E attaching the feed sw. holder.

Move the part e of 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 g of 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 F attaching the feed rack to the pickup unit.

Reattaching the pickup unit

(See Fig.13 to 16)

Joint f

Shaft

Joint e

Pu. shaft holder

Feed sw. holder

Pickup unit

Fig.13

Pickup unit

Joint f

Joint e

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 g to the slot of the feed rack and setting the part f of 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 g and to the bending part of the chassis (joint h) at a time.

CAUTION:

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.

Make sure that the part i on the underside of the feed rack is certainly inserted to the slot j of the change lock lever.

Feed rack

Joint g

Feed sw. holder

Feed rack

Part i

Pickup unit

Slot j

Joint g

Feed sw. holder

Fig.14

Shaft

Joint f

Joint h

Fig.15

Pu. shaft holder

Pickup unit

Feed rack

Joint f

Feed sw. holder

Fig.17Fig.16

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KD-SH909R

Removing the trigger arm

(See Fig.18 and 19)

Prior to performing the following procedure, remove the top cover, the connector board and the clamper unit.

Turn the trigger arm in the direction of the arrow to release the joint k and pull out upward.

Joint k

Trigger arm

CAUTION:

When reassembling, insert the part l and

m of the trigger arm into the part n and o at the slot of the chassis rivet

assembly respectively and join the joint k at a time.

Chassis rivet assembly

Trigger arm

Fig.18

Part n

Part o

Part l

Part m

Fig.19

Removing the top plate assembly

(See Fig.20)

Prior to performing the following procedure, remove the top cover, the connector board, the chassis unit, and the clamper assembly.

Remove the screw H.

Move the top plate assembly in the direction of the arrow to release the two joints p.

Unsolder the wire marked q if necessary.

1-16

Top plate assembly

Joints p

Fig.20

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