Precaution, Laser Diode; Handling Precautions For Traverse Deck - Yamaha DVD-C996 Service Manual

PRECAUTION, LASER DIODE

CAUTION:
This unit utilizes a class II laser. Visible laser radiation is emitted from the optical pickup lens when the
unit is turned on:
1. Do not look directly into the pickup lens.
2. Do not use optical instruments to look at the pickup lens.
3. Do not adjust the preset variable resistor on the optical pickup.
4. Do not disassemble the optical pickup unit.
5. If the optical pickup is replaced, use the manufactures specified replacement pickup only.
6. Use of control or adjustment or performance of procedures other than those specified herein may result in hazardous
radiation exposure.

HANDLING PRECAUTIONS FOR TRAVERSE DECK

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 breakdown during repair of the
optical pickup.
Handling of 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 bridge is soldered into the
flexible board (FPC Board).
When removing or connecting the shorting bridge,
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 adjustment).
It has already been adjusted.
Grounding for electrostatic breakdown prevention
1. Human body grounding.
Use the antistatic wrist strap to discharge the static
electricity 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.
DVD-C996/DV-C6280
Pickup unit
Flexible Cable
Solder
Use a clip or other item
to ground the unit.
(Magnified view)
Anti-static wrist strip
1MΩ
Conductive material
(sheet) or steel sheet
4