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Old 24th March 2010, 02:42 AM   #91
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Join Date: Sep 2006
How many fets do i need in each bank to test it?? and also do i put the z44's in or just the buz 102's since most of the buz102's are shorted
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Old 24th March 2010, 08:31 AM   #92
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Join Date: Nov 2003
Location: Louisiana
You'll need to have all of the FETs (Z44s or whatever you intend to use as substitutes) in the circuit.
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Old 20th April 2010, 11:13 PM   #93
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Join Date: Sep 2006
Ok replaced the power supply fets with IRFZ44n's Orginals were BUZ102's.

I also replaced all the rectifiers in the amp FES16JT's. Checked the gate resistors and the drivers all seem to test fine.

Amp draws excessive current . So i pulled the rectifiers but with them being out of circuit the amp wont power on or even attempt to.

So I checked the outputs and all seem fine. So im going to put the rectifiers back in the amp.

Wondering what i need to check since it draws excessive current?

The reason im asking is because with the old power supply fets in the amp it still powerd on just went into protection mode since a few of them were shorted and didnt draw excessive current
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Old 20th April 2010, 11:20 PM   #94
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Join Date: Nov 2003
Location: Louisiana
Clamp all semiconductors and power it up through a current limiting resistor. Measure the DC voltage across each of the emitter/source resistors to determine which channel is causing the excessive current draw.
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