Panasonic DVD-K29GCS - Manual (Page 19)

8 Self-Diagnosis Function and Service Modes
8.1. Optical Pickup Breakdown Diagnosis
The optical pickup self-diagnosis function and tilt adjustment check function have been included in this unit. When repairing, use
the following procedure for effective Self-diagnosis and tilt adjustment.Be sure to use the self-diagnosis function before replacing
the optical pickup when "NO DISC" is displayed. As a guideline, you should replace the optical pickup when the value of the laser
drive current is more than 55.
Note:
Press the power button to turn on the power, and check the value within three minutes before the unit warms up. (Otherwise,
the result will be incorrect.)
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DVD-K29GCS