On Feb 17, 8:09 am, wrote:
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

A common failure on that supply is high esr capacitors. Beyond that,
you cannot get any component level information on it.
You won't get the schematic, it was board level replacement repair and
HP never released them.