My Lulzbot Mini started failing homing recently and I measured no detectable connectivity between the nozzle and the homing washers. I started probing wires and deduced that the print frame under the glass plate isn’t connected to the main frame of the machine and hence not grounded with the control board. I traced the grounding wires and found out that the brown grounding wire from the print frame to the main frame has a TVS diode on it that is blocking all connectivity and preventing proper grounding. It’s a 1N6373 TVS diode that I assume has failed, otherwise I’m not sure why there isn’t any connection.
Does anyone have any advice on this? Should I replace the diode or bypass it altogether? Is this due to another issue entirely?
Edit: the other wire that comes from the grounding on the print frame is a white wire that goes to the “x-min” connection on the board.