Jvc TN-2006-1026 Service Manual

SERVICE MANUAL

MY00820079SERVICE MANUAL

CD MECHANISM

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

No.MY008

2007/9

1.1 Safety Precautions

SECTION 1

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.

1-2 (No.MY008)

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.

(caption) Anti-static wrist strap

Conductive material (conductive sheet) or iron plate

(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.

Pickup

Wires

Push switch

Base board

Frame

Flexible wire

Connector

CD mechanism assembly

Pickup

(No.MY008)1-3

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.

1-4 (No.MY008)

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

(No.MY008)1-5

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 A attaching 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.)

Top cover

Fig.1

Top cover

Fig.2

1-6 (No.MY008)

3.1.2 Removing the push switch

(See Figs.3)

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

move the screw B attaching the push switch.

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

bly.

Reference:

Remove the wires from soldered sections b of the push switch as required.

3.1.3 Removing the base board

(See Figs.3 and 4)

Caution:

Solder the short land c before the flexible wire is disconnected from the connector on the pickup. If the flexible wire is disconnected 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 C attaching 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 d of the frame in the

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

Reference:

Remove the wires from the soldered sections e on 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.)

Base board

Frame

Wires

Push switch

Flexible wire

Connector

Fig.3

Pickup

CD mechanism assembly

Pickup

Base board

Flexible wire

Frame

Fig.4

(No.MY008)1-7

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.)

Chassis unit

Front suspension spring

Frame

Rear suspension spring Rear suspension spring

Fig.5

Shaft

Damper F

Chassis unit

Shaft

Damper R

Frame

Shaft

Fig.6

1-8 (No.MY008)

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 release the joints f from the chassis unit.

Chassis unit

Clamper assembly

Chassis unit

Fig.7

Fig.8

(No.MY008)1-9

+ 18 hidden pages