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Gday Jim
The sensor board is powered on/off using a transistor switch on the mainboard, and is only turned on as reqd.
You can use ( <mode> IIRC ) to get past that message and the scope will happily work, but it means the autolevelling etc will be disabled. The scope will still work correctly and happily if manually aligned.
That said,there is a small board in the left fork arm, between the main board and the level sensor card. The error you get occurs if that board doesnt respond when booting up.
The reasons could be many, and need a bit of digging, as it may also be a fault on the main board transistor switch.
Andrew
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