Diagnosis Of Optical Pick-Up Unit - Panasonic SA-VK91DGCS Service Manual

13.2. Diagnosis of Optical Pick-up Unit

How to distinguish Laser destruction/damage
Confirmation 1
Remove cover of mechanism block so that you will see the lens of optical pickup.
Confirm emission of laser at the moment when power switch is turned on.
If there is no laser emission, laser diode is faulty.
Confirmation 2
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SA-VK91DGCS / SA-VK91DGCP