-Laser diode in the optical pickup may be destroyed by the static electricity generated in your clothes or body. Be especially careful with the static electricity.
6.2.2.2. Adjustment Procedure
1. Uncover the laser power meter. (as shown in Fig. 6 )
Fig. 6
2.Locate the sensor of the laser power meter at a position above the optical pickup (horizontally at a level of the disc position). (as shown in Fig. 7 )
Fig. 7
3.Press the 
key of the remote controller (“T0E ” changes to “LD ” of the LCD).
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