Gday Julian
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The message on the handset display is "Motor fault", not "Motor unit fault", and it happens during initial boot-up,
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OK, thats good, as the last post you noted the following,
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it starts to go through it's initialisation dance, 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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and that didnt make sense ( time wise ) as to when it occurred.
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hitting "Enter" once or twice clears it, and it goes on to the Menu / Alignment screen, but trying to drive the scope manually using the arrow keys achieves nothing
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Drat. I was hoping that at least the Up/Down may have worked, as that uses a different motor card, and would have proved that some part of the comms was working.
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As an experiment - I hooked up a length of WAN cable
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Experiments like that can get very expensive
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A std cat5 cable is wired opposite to the Meade Hbx cable,
ie 1-1 .. 8-8 vs 1-8 .. 8-1
You risk putting reverse polarity into the hbx doing this.
The fact the Hbx still fires up is good, but i hope nothing else got damaged. If you are ever unsure of the wiring, hold the plugs on the cable end to end to see how the wires are arranged.
Edit
Also, this site
http://jan.eaglecreekobservatory.org/
has a wealth of general information for LX90s and 497Hbxs etc
Andrew