JVC TN2007-1026 Manuale utente

SERVICE MANUAL

2007/9

CD MECHANISM

MY00820079SERVICE MANUAL

TN2007-1026

Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)

TABLE OF CONTENTS

1 PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19

1-2 (No.MY008)

SECTION 1

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.MY008)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 CD 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) It 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 CD pickup 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

Wires Push switch

Pickup

Base board

Pickup

Connector

Flexible wire

Frame CD mechanism

assembly

1-4 (No.MY008)

1.5 Important for laser products

1.CLASS 1 LASER PRODUCT

2.CAUTION :

(For U.S.A.) Visible and/or invisible class II laser radiation

when open. Do not stare into beam.

(Others) Visible and/or invisible class 1M laser radiation

when open. Do not view directly with optical instruments.

3.CAUTION : Visible and/or invisible laser radiation when

open and inter lock failed or defeated. Avoid direct

exposure to beam.

4.CAUTION : This laser product uses visible and/or invisible

laser radiation and is equipped with safety switches which

prevent emission of radiation when the drawer is open and

the safety interlocks have failed or are defeated. It is

dangerous to defeat the safety switches.

5.CAUTION : If safety switches malfunction, the laser is able

to function.

6.CAUTION : Use of controls, adjustments or performance of

procedures other than those specified here in may result in

hazardous radiation exposure.

!Please use enough caution not to

see the beam directly or touch it

in case of an adjustment or operation

check.

(No.MY008)1-5

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

1-6 (No.MY008)

SECTION 3

DISASSEMBLY

3.1 CD mechanism assembly

3.1.1 Removing the top cover

(See Figs.1 and 2)

(1) From the both side of the CD mechanism assembly, re-

move the four screws Aattaching the top cover. (See

Fig.1.)

(2) Lift the front side of the top cover and move the top cover

backward to release the two joints a. (See Figs.1 and 2.)

Fig.1

Fig.2

Top cover

(No.MY008)1-7

3.1.2 Removing the push switch

(See Figs.3)

(1) From the bottom side of the CD mechanism assembly, re-

move the screw Battaching the push switch.

(2) Take out the push switch from the CD mechanism assem-

bly.

Reference:

Remove the wires from soldered sections bof the push switch

as required.

3.1.3 Removing the base board

(See Figs.3 and 4)

Caution:

Solder the short land cbefore the flexible wire is disconnected

from the connector on the pickup. If the flexible wire is discon-

nected without applying solder, the pickup may be destroyed

by static electricity. (See Fig.3.)

(1) From the bottom side of the CD mechanism assembly, re-

move the screw Cattaching the base board. (See Figs.3

and 4.)

(2) Solder the short land c on the pickup. (See Fig.3.)

(3) Disconnect the flexible wire from the connector on the pick-

up. (See Fig.3.)

(4) Remove the base board from the joints dof the frame in the

direction of the arrow. (See Figs.3 and 4.)

Reference:

Remove the wires from the soldered sections eon the base

board as required. (See Fig.3.)

Caution:

When reattaching the base board, be sure to remove solder

from the short land c after connecting the flexible wire. (See

Fig.3.)

Fig.3

Fig.4

Wires Push switch

Pickup

Base board

Pickup

Connector

Flexible wire

Frame CD mechanism

assembly

Base board

Flexible wire

Frame

1-8 (No.MY008)

3.1.4 Removing the chassis unit

(See Figs.5 and 6)

• Remove the top cover and base board.

(1) From the top side of the CD mechanism assembly, remove

the front suspension springs and rear suspension springs

attaching the chassis unit to the frame. (See Fig.5.)

(2) Remove the chassis unit from the dampers on the frame in

an upward direction. (See Fig.6.)

Note:

• Pay attention to misuse and loss of each spring. (See Fig.5.)

• When reassembling, make sure that the three shafts on the

underside of the chassis unit are inserted to the dampers

certainly. (See Fig.6.)

Fig.5

Fig.6

Front suspension spring

Rear suspension spring Rear suspension spring

Front suspension spring

Chassis unit

Frame

Chassis unit

Shaft

Damper R

Damper F

Frame

(No.MY008)1-9

3.1.5 Removing the clamper assembly

(See Figs.7 and 8)

• Remove the top cover.

Move the clamper assembly in the direction of the arrow to re-

lease the joints ffrom the chassis unit.

Fig.7

Fig.8

Clamper assembly

Chassis unit

Clamper assembly

Chassis unit

1-10 (No.MY008)

3.1.6 Removing the loading/feed motor assembly

(See Fig.9)

• Remove the top cover, base board and chassis unit.

From the bottom side of the chassis unit, remove the screw D

and take out the loading/feed motor assembly in the direction of

the arrow.

Reference:

Remove the wires from the soldered sections gof the loading/

feed motor assembly as required.

Fig.9

Loading/feed

motor

assembly

Loading/feed motor assembly

Chassis unit

Indice

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