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krbahr · **Posted:** 24 Oct 2022, 04:52

There is a switch on the front right of the upper metal base that is closed when the laser is at the start position for side B. Your switch is not working or the electronics that sense the switch position has failed. When failing the pickup assembly just keeps moving toward the spindle motor and you’re hearing the gear teeth jump on the track and the pickup is physically being stopped traveling too far. When the switch is properly read the pickup movement stops at the inner read point.