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Old 11th January 2012, 11:50 PM   #1
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Default Power Acoustic PS2-2200

I got this amp with blown power supply fets -FQP50N06 i replaced them with IRFZ44's..


When powering up the outputs will get red hot only on 1 side of the amp..

I removved them they all tested fine.. So i took the drivers for the outputs out and they also tested fine...


I replaced the drivers for the outputs just incase they were defective and were testing fine..


The orginal drivers are B647 and D667

I replaced the D667 with a C3228 and the B647 with a A1275..


Power the amp up and they still get red hot...

Any ideas ?
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Old 11th January 2012, 11:56 PM   #2
timwebb is offline timwebb  United States
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are the gate resistors good? any solder bridges any where?
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Old 12th January 2012, 12:00 AM   #3
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AlL gate resistors are good and no solder bridges anywhere
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Old 12th January 2012, 12:09 AM   #4
timwebb is offline timwebb  United States
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hows the signal look on the gate resistor?
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Old 12th January 2012, 12:41 AM   #5
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Can you post a photo of the board?
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Old 12th January 2012, 12:52 AM   #6
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Heres a couple photos let me know if u need more
Attached Images
File Type: jpg Power Acoustic.JPG (580.2 KB, 25 views)
File Type: jpg Acoustic 1.JPG (476.4 KB, 24 views)
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Old 12th January 2012, 01:05 AM   #7
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Which outputs are getting hot Q...?

I see 2 are missing, were they defective?
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Old 12th January 2012, 01:08 AM   #8
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No they are fine i took all of them out on that side for testing and only stuck 2 of each back in..


The Tip36's are getting red hot if i take the 36's out and leave the 35's in circuit the amp will power up and idle fine..
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Old 12th January 2012, 01:12 AM   #9
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Circuit board designation please.
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Old 12th January 2012, 01:14 AM   #10
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Q115 Q114 Q118
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