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Old 16th January 2012, 02:18 PM   #1
diyAudio Member
Join Date: Oct 2010
Default boss rev755

is it acceptable to replace an IRF540N with an IRF540? i've been told that replacing a 540 with 540N will not work sometimes but i'm not sure about the opposite. this one came in with one bank of outputs shorted on each channel. i turned the bias all the way down and checked the drivers and resistors. but when i power up the amp (limited current) the new fets get hot very fast (no audio).
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Old 16th January 2012, 02:44 PM   #2
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Osvaldo de Banfield's Avatar
Join Date: Dec 2011
Location: Barrio Garay,Almirante Brown, Buenos Aires, Argentina
Verify the driver at the gate of the MOSFET. A bad transistor or diode in the gate can bias the fet at class A or directly into full on condition. I work daily with SMPSīs an motor drivers, and anytime the fet is damaged, the driver also is.

Good luck !!!
Osvaldo F. Zappacosta. Electronic Engineer UTN FRA from 2001.
Argentine Ham Radio LW1DSE since 1987.
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Old 16th January 2012, 04:32 PM   #3
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Join Date: Oct 2010
i found the problem... i overlooked a bad FET in the output. it wasn't shorted but it was out of tolerance so i replaced that bank of FETs also and now all is good!

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