The problem with a single axis is often caused by the PIC controller (the same one that was programmed with the L6 release). There are two of them, and it's a small SMD chip, not easy to replace without some experience or expert guidance (thank you, Brendan!) It is much cheaper to replace than getting a new board. Our helpful can all do it, so don't assume you need a whole new board if just one of the axis isn't working with a motor that is otherwise functional.
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Regards,
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? ?-Paul
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On Thu, Oct 31, 2024 at 12:31 AM, John Kmetz wrote:
This whole situation sounds familiar, and my final fix was to replace the Gemini 2 PC board. That was several years ago when they were only $300, but now they are much more (see the Losmandy website). I did follow Brandan's helpful advice at that time, but we never found any cracks in the solder joints or the PC board, ergo process of elimination. The board is not that hard to remove, 4 screws on the cover and 4 holding the board inside the case - just for inspection.
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The only other things that might cause a stall after a good balance would be too much tension of worm against ring gear, depletion of lubricant, or too low a voltage in the supply. I switched from the standard Losmandy 15V adapter to the Michael Herman-built 17V unit, which helps to power through the tight spots with a little extra motor torque.?
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Good luck Fritz.
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John
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Paul Kanevsky