DVD-LS92P, DVD-LS92PC - Panasonic DVD Service Manual (repair manual). Page 10

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The laser diode in the optical pickup may break down due to
potential difference caused by static electricity of clothes or
human body.
So be careful of electrostatic break down during repair of the
optical pickup.

1. Do not subject the optical pickup to static electricity as it is

extremely sensitive to electrical shock.

2. To prevent the breakdown of the laser diode, an antistatic

shorting pin is inserted into the flexible board (FPC
Board).
When removing or connecting the short pin, finish the job
in as short times as possible.

3. Be careful not to apply excessive stress to the flexible

board (FPC Board).

4. Do not turn the variable resistor (Laser power adjust-

ment).

It has already been adjusted.

1. Human body grounding 

Use the antistatic wrist strap to discharge the static elec-
tricity from your body.

2. Work table grounding

Put a conductive material (sheet) or steel sheet on the
area where the optical pickup is placed and ground the
sheet.
Caution

The static electricity of your clothes will not be
grounded through the wrist strap. So take care not to
let your clothes touch the optical pickup.