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Old 10th June 2004, 09:34 PM   #1
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elviukai's Avatar
Join Date: Apr 2003
Location: EU- Electronic Union country
Default miracles with Zen V4

frankly speaking I dont like always search for help but last week was very intresting- burn about 34 irfp 044/240/054 fets..

what is wrong with one chanel, I even ghange all parts except film caps, but afters power on, and open bias voltmeter from rezistor R0 reads about 0,45-0,67 it variuos itself,and after 5-7 seconds and then down to o,oo..

result- mosfets dead, no other parts show any failure( resistors has normal values, caps charging/discarging, zenner diodes show normal values, diode also, there is no shor circuit between fet legs, between pcb track( I think final that pcb failute) after failure at all mosfets come 45 voltage almost at all legs, even at ztx 450

what can be problem there?

any caps film cap dead? rezistors after beeing active changes values?

I have no theory- all posible checked(not 100%, because 5 days working 6-9 hours with this amp make me tired )

ANY sugestion welcome..
natural sound reproduction from traditional dynamic drivers?!! come on.. no no, it can be.. it must be!..
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Old 10th June 2004, 10:32 PM   #2
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Join Date: Apr 2003
Location: Southern Tier NY
Get some sleep. Take two days off, and recheck everything. Then check the polarity of the current sense transiters. Don't have the part number in front of me. I had similar problem.
Living Life Doing the Waltz in 4/4 meter.
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