JVC KDSH-99-R Service manual

SERVICE MANUAL

CD RECEIVER

KD-SH99R

Detachable

ATT

ANGLE

AUX SEL

KD-SH99R

R D

VOLUME

Contents

Safety precaution Preventing static electricity Disassembly method Adjustment method Flow unit reading TOC of CD/CD-R/CD-RW Maintenance of laser pickup Replacement of laser pickup Description of major ICs

RM-RK100

Area Suffix

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

1- 2 1- 3 1- 4 1-15

1-18 1-20 1-20 1-21~45

No.49645

Jun. 2001

KD-SH99R

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.

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KD-SH99R

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-SH99R

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-SH99R

Top chassis

Fig.4

Top chassis

Heat sink

Fig.5

Fig.6

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KD-SH99R

Removing the CD mechanism assembly

(See Fig.7)

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

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

Removing the motor assembly

(See Fig.8 to 10)

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.7

Motor braket

Remove the two screws H attaching the motor bracket.

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

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

Motor braket

Clutch assembly

Motor assembly

Arm braket assembly (R)

Fig.8

Main board

CN703

CN601

Motor braket

1-6

Washer

Fig.10

Fig.9

Removing the main board

(See Fig.11 to 15)

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 J 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 K attaching the rear panel to the bottom cover on the back of the body.

Arm brackets (L)

CN701

CN702

Main board

Fig.11

KD-SH99R

Arm brackets (R)

Rod gear

Arm brackets (R)

Arm brackets (L)

Main board

Rod gear

Fig.12

Rear panel

Fig.13

Bottom cover

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KD-SH99R

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

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

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

Joint a

Main board

Fig.14

Removing the lifter switch board

(See Fig.16)

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

Rear panel

Lifter switch board

Rear heat sink

Fig.15

Bottom cover

Remove the two screws Q attaching the lifter switch board.

1-8

Fig.16

KD-SH99R

Removing the lifter board

(See Fig.17 to 23)

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 R attaching the front bracket on both sides of the body.

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

Main board

CN702

Front bracket

Fig.17

Front bracket

Fig.18

Joint c

Front bracket

Lock lever

Fig.19Fig.20

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KD-SH99R

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

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

Joint d

Joints e

Lifter board cover

Joints e

Joint d

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

Joints e

Lifter board

Joint e

Front bracket

Fig.21

Lifter board cover

Fig.22

1-10

Fig.23

KD-SH99R

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

Removing the front board

(See Fig.24 and 25)

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

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

Disconnect the wire from connector CN503 on the front board.

If necessary, unsolder connector CN502 on the front board.

Removing the volume board

(See Fig.25 and 26)

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

Line in board

Joint f 11

Front board

Rear panel

Fig.24

Soldering

(CN502)

CN503

Fig.25

Soldering

Volume board

Remove the two 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.25 and 27)

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

Disconnect the wire from connector CN503 on the front board.

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

Volume board

Volume lens, Volume ring

Rng knob

Fig.26

Line in board

Fig.25

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KD-SH99R

Removing the CD mechanism control board (See Fig.1 and 2)

Unsolder the part a and b on the CD mechanism control board.

Remove the stator fixing the CD mechanism control board and the damper bracket (To remove the stator smoothly, pick up the center part).

Remove the screw A attaching the CD mechanism control board.

Remove the CD mechanism control board in the direction of the arrow while releasing it from the two damper bracket slots d and the front bracket slot e.

Disconnect the flexible wire from connector on the pickup unit.

ATTENTION:

Turn the FD gear in the direction of the arrow to move the entire pickup unit to the appropriate position where the flexible wire of the CD mechanism unit can be disconnected easily.

(Refer to Fig.2)

CD mechanism assembly

Front bracket

Pickup unit

Damper bracket

Fig.1

Flexible wire

CD mechanism control board

Shift the lock

Removing the loading motor

(See Fig.3 to 5)

Prior to performing the following procedure, remove the CD mechanism control board.

Remove the two springs f attaching the CD mechanism assembly and the front bracket.

Remove the two screws B and the front bracket while pulling the flame outward.

Remove the belt and the screw C from the loading motor.

Loading motor

FD gear

Loading motor

Pull outward

Fig.2

CD mechanism control board

Front bracket

Fig.3

Front bracket

Pull outward

1-12

Fig.5

Belt

Flame

Fig.4

KD-SH99R

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 motor).

Remove the three screws D and the damper bracket.

Raise the both sides fix arms and move the fix plates in the direction of the arrow to place the four shafts g as shown in Fig.8 and 9.

Remove the CD mechanism assembly and the two springs h attaching the flame.

Remove the two screws E and both sides rear damper brackets from the dampers. Detach the CD mechanism assembly 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.

CD mechanism

Front bracket

CD mechanism

Flame

assembly

Damper bracket

Fig.1

Damper bracket

Fig.6

CD mechanism control board

Fix plate (L)

Fix arm (R)

Fig.7

Rear damper bracket

Fig.8

Rear damper bracket

Fix plate(R)

Fix arm (L)

Damper

Fig.9

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KD-SH99R

Removing the feed motor assembly

(See Fig.10)

Prior to performing the following procedure, remove the CD mechanism control board, the front bracket (loading motor) and the CD mechanism assembly.

Remove the two screws F and the feed motor assembly.

Removing the pickup unit

(See Fig.10 and 11)

Prior to performing the following procedure, remove the CD mechanism control board, the front bracket (loading motor), the CD mechanism assembly and the feed motor assembly.

Detach the FD gear part of the pickup unit upward. Then remove the pickup unit while pulling out the part i of the FD screw.

Feed motor assembly

FD gear

Nut push spring plate

FD screw

Pickup unit

Fig.10

Part i

Part j

Pickup unit

Pickup mount nut

Pickup unit

ATTENTION:

Remove the screw G attaching the nut push spring plate and the pickup mount nut from the pickup unit. Pull out the FD screw.

When reattaching the pickup unit, reattach the part j of the pickup unit, then the part i of the FD screw.

Removing the spindle motor

(See Fig.12 and 13)

Prior to performing the following procedure, remove the CD mechanism control board, the front bracket (loading motor), the CD mechanism assembly and the feed motor assembly.

Turn up the CD mechanism assembly and remove the two springs k on both sides of the clamper arms. Open the clamper arm upward.

Turn the turn table, and remove the two screws H and the spindle motor.

FD screw

Spindle motor

Fig.11

Fig.12

1-14

Fig.13

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