Starbook is at fault. Vixen could never fix it, so they replaced it with Starbook TEN,which is NOT compatible with Starbook mounts at all.
If it is an SXD and you want to do astrophotography, you need to replace the board and hand controller.
Best bet is wait for an SXD2 or SXP. I have been offered a near mint SXW, at a VERY nice price, but it will take an additional $500 to get it decent for astrophotgraphy (when they work, they are BRILLIANT).
To be honest, photographically the SX range only holds 2 kg more than the VERY tried and VERY respected GPD2 - a true legend. Many a good astrophotographer use them for their travel mounts with smaller scopes. The GPD2 handles my 2 refractors VERY easily and accurately. I use the Synscan GOTO kit on it, and found it superbly accurate (though needed a recent tune up)
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