Panasonic SL-SV550P Service Manual page 4

1. the optical pick-up returns to the normal state by exchanging the traverse deck, and
2. the waveform or voltage of the servo ICs are correct.
Note:
It is not always necessary to exchange the traverse deck when an error message is displayed.
Be sure to check if the circuit is defective or not before exchanging the traverse deck.
Note:
If any other disc than the test disc (SZZP1054C) is used, an error message may be displayed.
This is not a malfunction.
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