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Peter, you could be on to something.
Last time the RA "H" bridge was definitely dead and the input power, 12~18VDC goes to very few places, the PSU and RA/DEC "H" bridges.
There may be an issue with input power damaging these Bridges. That said the "H" bridge input Vmax is ~55 Volts and the PSU IC ~ 25V. They are both well spec'd above the input voltage.
Well in any case the only commone thing is the +12V rail.
Lester, also your mount is a Titian 50 not a std Titian, for Gemini settings.
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