Sanwa Gemini X problem.

[AndyFoster]

Hi all,
After a little bit of advice. I have a Sanwa Gemini X that doesn't operate the steering servo correctly, doesn't move at all to the left and only a little bit to the right and generally doesn't act as it should. Have tried a different servo - same problem and a different receiver - same problem. So assume it must be my transmitter? Any ideas? And where would I be able to get it repaired?

Thanks in advance.

Andy