This is the most common ailment. The service manual provides the specific test points (TP) on the mainboard. Using an oscilloscope and following the manual’s RF (Radio Frequency) envelope adjustment guide, you can determine if the laser diode is weak or if the servo needs recalibration.
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Dust or debris on the objective lens can scatter the beam. Clean it gently with a dry, lint-free swab. This is the most common ailment
