CNC plotter 1800 x 80cm, first build, questions and queries.

[JAZZCNC]

1. The motors do not spin despite the fact that Mach software shows movement using the arrows on the keyboard. The motor is locked, it cannot be turned. There are diodes on the breakout board, it seems to me dedicated to outputs, not activated, only the 'outputs status' diode is on, what should I check step by step to verify if the board is ok?

Mach 3 doesn't get any feed back from the motors so it just assumes they are moving that's why the Dro's show movement. The BOB as probably disabled the outputs as per my other post.

2. How to check if the drivers are ok? The voltage is fine, 42V on each of them. The voltage between A + and A- and B + and B- in the case of one motor connected is 1.7V, in the other 1.4V. Where there is no motor connected, 42V between A + and A-. Is this correct?

Be very carefull when you are sticking probes into this area you can very easily fry those drives and what ever you do, DO NOT disconnect the motor connections from the drives while powered up or you will 99% destroy them. It's perfectly fine to power the drives without the motors attached but never remove the motor wires while drives are powered up.