Preventing Static Electricity; Handling The Traverse Unit (Optical Pickup); Attention When Traverse Unit Is Decomposed - JVC BC72 Service Manual

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VS-DT7R

1.5 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.

1.5.1

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) 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

(1) In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement op-

tical 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) 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)I t is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it

*Please refer to "Disassembly method" in the text for the CD pickup unit.

• Apply solder to the short land before the flexible wire is dis-

connected from the connector on the CD pickup unit.

(If the flexible wire is disconnected without applying solder,

the CDpickup may be destroyed by static electricity.)

• In the assembly, be sure to remove solder from the short land

after connecting the flexible wire.

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