Table of Contents
Advertisement
5 PREVENTION OF STATIC ELECTRICITY DISCHARGE
The laser diode in the traverse unit (optical pickup) may break down due to static electricity of clothes or human body. Use due
caution to electrostatic break down when servicing and handling the laser diode.
5.1.
Grounding for electrostatic breakdown prevention
Some devices such as the DVD player use the optical pickup (laser diode) and the optical pickup will be damaged by static
electricity in the working environment. Proceed servicing works under the working environment where grounding works is
completed.
5.1.1.
Worktable grounding
1. Put a conductive material (sheet) or iron sheet on the area where the optical pickup is placed, and ground the sheet.
5.1.2.
Human body grounding
1. Use the anti-static wrist strap to discharge the static electricity form your body.
5.1.3.
Handling of optical pickup
1. In order to keep the optical pickup in good quality, during transporting and before installing, both ends of the laser diode are to
be shortcircuited. After replacing the part with a new one, remove the short circuit according to the correctprocedure. ( Refer to
this Service manual )
2. Failure to do so will damage the laser diode due to the external current surge from the power supply in the tester.
5.2.
Handling Precautions for Traverse Unit (Optical Pickup)
1. Do not give a considerable shock to the traverse unit (optical pickup) as it has an extremely high-precise structure.
2. When replacing the optical pickup, install the flexible cable and cut its short land with a nipper. Refer to the optical pickup
replacement procedure in this Service Manual. Before replacing the traverse unit, remove the short pin for preventingstatic
electricity and install a new unit. Connect the connector as soon as possible.
3. The flexible cable may be cut off if an excessive force is applied to it. Use caution when handling the cable.
4. The half-fixed resistor for laser power adjustment shall not be adjusted. Do not turn the resistor.
7
NV-VP32GN / NV-VP32EE
Advertisement
Table of Contents
