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Old 13th November 2012, 05:52 AM   #11
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Yes the power supply is regulated
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Old 13th November 2012, 07:14 AM   #12
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The IRFB42N20D may work. If they don't, you could try others rated for 200v. If you can't find anything that will work, I'd try the 3415s. If they fail, cut the rail voltage back a few volts and they would likely survive. When you're working with an amp that has discontinued parts, there may not be any definitive solution. You may have to do a bit of testing to see what works.
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Old 14th November 2012, 10:51 AM   #13
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Perry ,


Do you think the FQP34N20's would work in this amp ??

Heres the datasheets for the orginals and the FQp34n20's






FQP34N20 pdf, FQP34N20 description, FQP34N20 datasheets, FQP34N20 view ::: ALLDATASHEET :::


SSP45N20 pdf, SSP45N20 description, SSP45N20 datasheets, SSP45N20 view ::: ALLDATASHEET :::
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Old 14th November 2012, 11:11 AM   #14
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It's very difficult (for me) to tell if one particular output will work. I've learned that testing is the only foolproof way to tell if an output will work reliably.
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Old 16th November 2012, 12:36 PM   #15
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I found the orginal outputs and they should be in today..

MCM Electronics had them in stock ..

I was trouble shooting the amp some more and found that the Transformer is shorted also..

I have one out of a parts amp im going to replace it with so hopefully nothing else is defective ..

Thanks for the help
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Old 16th December 2012, 01:05 AM   #16
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I replaced the transformer in this amp also replaced the outputs..


Amp powes up and produces both + - rail voltages and also produces both + - regulated voltages


Amp has no output before i replaced the Transformer and outputs amp powerd up and produced audio but was very distorted and if i twisted the transformer it would draw 60 amps of current ..

After i replaced the transformer with the same one the amp has no output now any ideas ??
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Old 16th December 2012, 05:34 AM   #17
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Do you have audio on pin 7 and a triangle waveform on pin 6 of the 4080?
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Old 16th December 2012, 10:05 AM   #18
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I was mistaken before this is not a HIP4080 based amp
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Old 18th December 2012, 08:48 PM   #19
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anyone have any ideas on why this amp has no output after i replaced the transformer?
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Old 18th December 2012, 09:22 PM   #20
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There is an opto-coupler that biases the drive stage on. You need to determine if it's being driven to bias the amp on or if it's not being driven. Then you will know what part of the amp to troubleshoot.

This amp appears to be like the sony XM-D400P5. If you don't have that service manual, email me.
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