Gday Julian
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We were having a tinker today, and I think it is most likely a fault with the handset cable (or possibly the handset, or the motors / motor controllers).
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Well that narrows it down a bit
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but as soon as you start the alignment procedure, or try to manually drive it, we get the "Motor fault" message.
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Do you mean "Motor Unit Fault"??? and does it reboot immediately???
( The exact wording of the error is important here )
The "Motor Fault" message ( with beeping ) can only occur during the initial bootup process, so i suspect it was really a MUF and reboot??
I have seen some Hbx cables that fit so badly that they lose contact with the slightest bump. This would line up with your intermittent symptoms.
Can you try the same test but this time get someone to forcibly hold the Hbx cable in the scope and Hbx sockets so they cant wiggle during operation.
Does it work now????
Andrew