RepRapPro Mendel 3 Tricolour (December of 2015-likely one of the last ones shipped).
Hopefully someone can help me out; I'm stuck.
I have a Duet 0.6 with Duex4 board it was working without fail in tricolour then turned off for several months. Upon restarting the unit and attempting the G32 command the Z axis motors instantly shuddered and acted erratically. After reading through the forums I thought the stepper driver failed, so I bought a new Duet 0.6 board and scaled the machine down to a single nozzle (well disconnected the Duex4). Replaced the firmware to 1.09 (latest), replaced the SD Image back to original, and essentially started over. To my surprise the Z axis shuddered immediately with the new board.
Things I've tried:
Exchanged the Z wires for the X-Y stepper's wires, then the X-Y shuddered.
Plugged the Z motors individually into the Duet; individually they operate correctly.
Pulled the 5V PCB board that places the steppers in series to check their connections (fine)
Used a brand new stepper and replaced each motor one at a time (shudders)
Traced each wire individually from board to stepper (continuity)
Replaced the firmware and SD Image back to original files (shudders)
Board heats up, nozzle heats up, X and Y steppers operate normal
There's 12.15V and 4.94V on the board
The Z axis steppers will seize after any command until the stop command is given then they'll free up.
Can the power supply cause this?
RepRapPro Mendel 3
