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Look at the DIN sockets and you will see the round pin hole, and a linear slot too for each pin.? There are metal fingers in the slots.? You can get a thin nail or blade into the slot and push the metal connector fingers inward.? This might help get your cable connector pins better contact.

Now to isolate the problem.

Swap the RA and DEC cables if you are able.? Does the problem move with the cable?? If yes replace the bad cable.

Swap the RA and DEC motor (just connect the cable end to the wrong motor).? Does the problem move with the motor?? If so...consider buying a new motor.??

If the problem stays in the same place (DEC, or RA) regardless of cable or motor, ...seems like the trouble is in the Gemini.? The Gemini-1 has a chip for each axis that reads the optical encoder.? That chip can become damaged.? I have these parts and do these repairs.? So if that ends up being the problem...in the G-1, you can contact me off line to do a repair.

What causes the optical encoder chip or a motor to become damaged?

Simple: the 12 to 18V pins running the motor are far higher than the 5V max HEDS optical encoder unit in the motor, and far exceeds the 5V max of the optical signal detector chip in the Gemini. If one were to mistakenly rotate the round DIN cable then the pins go into the wrong position and ...kapow.??

This happens to someone every year.??

So...label your cable ends with some type of marker and where they insert, so the orientation is clear, even in the darkness when you set up.? I use white label maker labels cut into an arrow shape.??

Very best of luck,

Michael