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Hi PCW
Thanks for your prompt reply
I changed the step time and space time to 5000 for all four motors, switched off everything, and restarted , however it makes no difference (the motors don't move)
I was not sure where to measure the 5v, but choose 7i76u's TB2 connector and checked axis 0 through 3 , using the ground and +5VP on each axis, and all measure 4.9v . (The 5v comes from the 7i92T).

Thanks, I added dcconf lines (see attachment) but still get the same pin does not exist error

7I73 version 16 firmware

Increases the time between setting the row outputs
and sampling the column inputs( for longer cables etc)

Firmware:

 

SSerial update script:

 


 

I would first try setting the step time and step space to 5000 (5 usec)
since 2500 (2.5 usec) is the drives minimum (0 margin)

Also check the 5V at the 7I76U to make sure its not low