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I can't imagine a mechanical problem with the mount that would cause a star to drift up and down in Dec in the space of a few minutes and with the mount pointing East. To rule it out you could use a reticle eyepiece and watch a star drift, with the mount running stand-alone, just tracking in RA.
If it drifts properly there you know the problem has something to do with the way your electronics are hooked up, or with what the software is doing.
Cheers
Steffen.
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