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Old 23rd December 2011, 03:54 PM   #1
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Default Boss Audio REV 3000 in protect

this amp had some burnt power Mosfets and I replaced all those (IRFZ44N) and the gate resistors (47 ohms) and went ahead and replaced all of the audio Mosfets (IRF2807) powered it up and it shorted one of the power mosfets and shut the power supply off. so I removed all the power mosfets and powered it up and it goes into protect, I have 4.29v on all of the gate pads of the power side and 13.91 on all of the Drain pads, I need to know where to check from that...also all of the gate resistors make good contact to the gate pads .
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Old 23rd December 2011, 11:01 PM   #2
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Please post a photo of the inside of the amp.
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Old 24th December 2011, 01:52 AM   #3
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what outputs transistors does that amp used?
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Old 24th December 2011, 04:19 AM   #4
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IRF2807
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Old 24th December 2011, 04:20 AM   #5
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Click the image to open in full size.
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Old 24th December 2011, 04:36 AM   #6
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It looks like there are two banks of four for the PS FETs. Measure between the gate pads for each bank. From each one to the other three FETs in each bank, confirm that you read ~90 ohms.

Were the 2807s shorted originally?
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Old 24th December 2011, 04:46 AM   #7
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they had some rough looking ones and was missing a couple off the board so I replaced them all , there are 10 FETS in the PS (IRFZ44N)
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Old 24th December 2011, 04:50 AM   #8
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Click the image to open in full size.
a clearer photo

Last edited by bigpun4fubu; 24th December 2011 at 04:58 AM.
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Old 24th December 2011, 05:24 AM   #9
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ok from gate pad to gate pad each reads 93 ohms, Q315 to Q314 reads OL but im assuming that is between the 2 banks of 5 FETS and that is correct????
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Old 24th December 2011, 05:25 AM   #10
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Q315 is the 5th FET and Q314 is the 6th beginning the 2nd bank
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