Hello,
I'm looking for the schematic of this medical instrument or even only
the schematic of its power supply board (HP 43100).
The switching mosfet is arcing between drain and source until a
resistor fuses on the 220V AC line (usually a couple of zeners around
the mosfet driver BJT go short too). I checked the snubber part of the
circuit and it tests ok. The schematic would tell me if arcing
interrupted one or more hidden traces around the mosfet circuit.
D-S arcing sounds like no current recirculation, doesn't it?
Thanks in advance

Francesco