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Old 16th March 2019, 06:23 PM   #1
RockfordFIx is offline RockfordFIx  United States
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Default mmats 4090

does anyone by chance know what the power mosfets are for the powersupply. I have one that is in for repair and it has IRF1407 but the have solder on them and these are clamped to heatsink. this makes me believe it was a substitute. also this amp has temps sensor outputs for each channel. one of the sensor wire shorted on the mosfet. does any one know the value of these.
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Old 18th March 2019, 02:36 AM   #2
Perry Babin is offline Perry Babin  United States
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Post a photo of the amp if you still need help with it.
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Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version.
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Old 11th August 2019, 06:40 PM   #3
RockfordFIx is offline RockfordFIx  United States
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hey perry I replaced the IRF1407s irf3205s and replaced the temp sensors. I also had to replace both amplifier gains and xover pots. the plays and sounds fine until it pops then sounds distorted. amp is warm but not in thermal shut down. compared the old temp sensor with new at room and heated them to make sure they were at similar resistance. I then applied 200c from hot air gun and forced the amp into thermal for each sensor. the problem I am having is not same. I have found the lm339 trips protalection around 1.1vdc a cross each sensor. I can disconnect power for a split second and amp plays fine after that.
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Old 11th August 2019, 06:40 PM   #4
RockfordFIx is offline RockfordFIx  United States
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I have also replaced the lm339.
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Old 11th August 2019, 10:11 PM   #5
RockfordFIx is offline RockfordFIx  United States
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now I am thinking there was an issue with the powersupply. I just used both channels and irf3205s shorted. the original FETS wer irf1407 is the irf3205 not a good sub?
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Old 11th August 2019, 10:17 PM   #6
Perry Babin is offline Perry Babin  United States
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Did the 3205s short at very high power or just at idle?
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Old 11th August 2019, 10:19 PM   #7
barber02 is offline barber02
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Join Date: Jun 2018
I recommend that you contact MMats for the info you seek. I had one come in that needed a new output inductor and they were very helpful. You might get to the finish line with this amp in short order.

David
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Old 13th August 2019, 11:21 AM   #8
RockfordFIx is offline RockfordFIx  United States
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the IRF3205'S shorted at high power. I was running it with audio on the input and mids and subwoofer. powersupply only showed 20 to 40 amp spikes. I ordering irf1407s today.
specs
irf1407 = 75v , 130amp
irf3205 = 55v , 110amp
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