Panasonic SA-BT222EB, Service Manual

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2.4. Handling Precautions for BD Drive
The laser diode in the optical pickup unit may break down due to static electricity of clothes or human body. Special care must be
taken avoid caution to electrostatic breakdown when servicing and handling the laser diode in the BD Drive.
Figure 1
2.4.1.
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 electric-
ity in the working environment. Proceed servicing works under the working environment where grounding works is completed.
2.4.1.1. Worktable grounding
1. Put a conductive material (sheet) or iron sheet on the area where the optical pickup is placed, and ground the sheet.
2.4.1.2. Human body grounding
1. Use the anti-static wrist strap to discharge the static electricity form your body.
Figure 2