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Old 17th February 2012, 03:29 PM   #21
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Location: Louisiana
What's the DC voltage on the 3 legs of FET192?
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Old 17th February 2012, 03:52 PM   #22
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Leg 1:-79.9
Leg 2:1.28
Leg 3:-82.0
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Old 17th February 2012, 03:58 PM   #23
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You probably have open resistors or defective transistors in the circuit driving this transistor.
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Old 17th February 2012, 04:10 PM   #24
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Im going to check the circuit and go get some resistors / transistors if needed...


will post results later..
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Old 19th February 2012, 07:03 AM   #25
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Do you have another pic of the area around FET401 Its right next to
Fet192..

Also a pic of the other side of the board around the rectifiers ?


Someone has worked on this before and wanna make sure they are the correct parts that are in it..


Fet 192 and Fet401 are 540's correct?
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Old 19th February 2012, 07:59 AM   #26
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I think FET401 is an N-channel FET but I'm not 100% sure. FET 192 is a 540.
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Old 19th February 2012, 08:02 AM   #27
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In the amp i have Fet191 has a diode solerd to leg 3 is that suppose to be there or did someone add it ?


Wondering if i should ake it out or not ?
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Old 19th February 2012, 08:12 AM   #28
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Leave the diode. I think it's to help protect the op-amps when the regulator fails.
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Old 19th February 2012, 08:17 AM   #29
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Ok will do..

Hopefully all the right parts are in this amp someone has worked on this before and has been all over the board..

The amp i have here Fet192 Fet401 Fet191 all have IRF540's in there locations..


Also i rebuilt the area around Fet192 Replaced all resistors transistors and the regulator..

As soon as i powerd it on the fans spun for 1 sec then Q109,Q111,D105,Q108 all failed again..
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Old 26th February 2012, 02:49 AM   #30
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Ok finally got the parts in for this amp..

I now have + - 15 volts on the op-amps..


Now i have 81 volts of DC measured directly across the speaker terminals..


All outputs test fine..


Any ideas where to go next?
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