Info on power board?

Any chance you have info (schematics) on the board that interfaces the fan, pump and laser head? it has a pn: GF-00105-12-M3092.

Just trying to troubleshoot why one of the caps is blown, and somehow affecting the I2C bus (a number of the I2C sensors are not responding, so GF gives an orange button error, also verified via logs).

Thanks!

I’ll have to dig up my notes.

Which cap is blown?

Quick update: the GF is back working now. Though would still be interested in details on the board.

At first it looked like a cap on the +12V input (much thanks to your schematics of the controller board for pinouts!). But I am thinking it is probably a ferrite bead or something similar…

GF_bead

GF_bead2

but there was still a power to gnd short…
further digging turned out that it was one of 2 caps on the input side of the regulator to the exhaust fan was shorted. which is odd for a cap to fail short, not open.

whatever the failure it caused a large current draw from the controller board and melted the traces off of the ribbon cable.
GF_cable

monitoring this power line appears to pull around 1A max during operation… so we ran a separate wire in its place…
so, working for now!

Multi-layer ceramic caps are famous for failing short circuit. If they are stressed mechanically they can crack. Over time moisture from the atmosphere gets into the crack and starts electrolysis that then makes a conductive track with a low enough resistance to make them get hot enough to burn.

That is most likely the case. The position of this board is right next to the exhaust fan so all smoke from any job will go directly over this board. Who knows what build up there could of been to cause a lower impedance at some point in the circuit. There is no conformal coating to protect the circuit from any environmental influence, something I will probably add to prevent another failure.