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Many thanks. I redid step 3 exactly as per instructions and I still get the error on the Z-Axis. It seems any permutation of limit switches / Motor/Encoder / Driver PCB I get an error on the Z-Axis. As I have said, I appreciate any ideas.

Sorry, but where am I going wrong? If I plug the X-Motor/Encode and X-Limits plugs into the Z-Motor/Encode and Z-Limit sockets on the electrical tower and get the same fault, why haven't I eliminated issues or faults with the Z-Axis motor and encode and Z limit switches?

Many thanks for your reply. Yes, that may be another compounded problem, but this was working before the fault and when the X-Motor/Encoder plugged into the Z-Motor/Encoder socket and visa-versa I still get the error for the Z-axis. As a result, I feel I can discount both the Z motor/encoder...

Thanks for the suggestion. I have already swapped the connectors for X and Z motor encoders and get the same error. I therefore beleive I had eliminated both the Z motor/encoder and the Z wiring from causing the error/fault.

Thanks for the reply. Any suggestion is very welcome. The Z-Axis has a single limit switch, with the second hardwired to be a s/c. The X, Y and Z axis limit switches and motor/encoders are identical. In theory it is possible to mix and match these to the Electrical Tower and the machine would...

Many thanks for the idea. I have the cover off and I can rotate the work and can confirm the motor is connected. All looks and behaves in a mechanically sound way. Before I get the long 'beep' the motor and screw does 'inch' down a small motor step. I have also checked the limit switch which...

I've downloaded various manuals from: https://www.service-manual.net/?download=57239-gerber-sabre-404-408-series-service-manual for $13. Unfortunately it doesn't have any of the PCB circuit diagrams for the boards in the Electrical Tower. So don't feel much further forward :-(

I'm a newbie to this machine and had it working for a short while. Recently, when turning on the machine I got the above error. I also have an illuminated Red LED for AMP FAULT. All the green LEDs are lit apart from SPIN #2 My background is in embedded systems (mix of electronics and software)...