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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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HP-43120A defibrillator PS
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 |