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Does the DEC still work? If you've updated the firmware, it is important for it to successfully take and I know it can take a while (approx 5 minutes from memory).
It's been over a year since I donated my LXD55 mount (very similar and use the same motor assemblies as the LXD75) but if I recall correctly, try a motor calibration which should be found under "utilities" somewhere. Calibration applies a short but high speed slew command to each motor.
When this is finished, you should then conduct a "train" of the DEC and RA on a fixed (stationary) object.
I have run my LXD55 on a 12V battery with no problems at all.
I doubt the motor has failed if this has stopped due to a software type upgrade.
Darrin...
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