While trying to resurrect my Clausing Kondia fv-1 with delta 20 control, I've been getting fairly frequent x servo errors which result in faulting out of the running program. The error message is:

Emergency stop
X servo error
Loss of feedback or no motion detected on x axis
Enter reset to continue
Pic revision #006 - 6/06/88
Spindle SW is in auto position

From reading a few threads, I gather the problem is either related to
1) higher than expected friction/resistance to movement,
2) a defective x servo encoder, or
3) a problem with connections or cable from the encoder

Before i start dismantling stuff, is there a good way to figure where to start troubleshooting this?

Thanks,

Lee