Optical Pickup Self-Diagnosis And Replacement Procedure / 光ピックアップの故障診断と交換手順 - Yamaha DVD-S840 Service Manual

DVD-S840
OPTICAL PICKUP SELF-DIAGNOSIS AND REPLACEMENT PROCEDURE
1. Self-diagnosis
An 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 CD laser drive current is more than 55 (70 for DVD).
Note:
Press the STANDBY/ON button to turn on the power. Check the value within three minutes before the unit warms up.
(Otherwise, the result will be incorrect.)
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