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  #1  
Old 01-14-2012, 12:50 PM
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Default Amp repair help

I have a blown pa p600.5s
Goes into protect right away
I found 4 blown diodes with no part number so if anyone has a idea on these feel free to chime in


Also I found 4 shorted fets

Along with a shorted gate resister and possibly a shorted gate fet.
The two larger fets in the drive read 34ohms across the gate, I'm just not sure if it's the blown resister showing this though would it be smart to just replace them or should they be ok?

Any help would be appreciated
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Old 01-14-2012, 01:36 PM
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what the name of the amp? and u have a picture of the whole amp?
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Old 01-14-2012, 01:51 PM
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The amp is a planet audio p600.5s

Also I chose the right 2 blown fets and cut them out, so the MOSFET on the gate, the gate resister and the other 2 fets check out now, so it was 1 of each of the fets on the sub channel.


I'm still stumped on the diodes though
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Old 01-14-2012, 02:00 PM
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actually i think i found the diode
it was super faded but i think it says Fmg22R, although that part number isnt on mouser or digikey

another breakthrough!!!!

one pair is a Fmg22r and one pair is a Fmg22S
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Last edited by tymoto21; 01-14-2012 at 02:03 PM.
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Old 01-14-2012, 02:08 PM
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does it pull a lot of current when its on?
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Old 01-14-2012, 02:11 PM
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idk only time i ever powered it on was on a 50A power supply, i got it from a friend blown and its been sitting for a while, through my work i have been learning alot about fets and diodes and such and thought today would be a good lazy day to tackle the project.

im not so sure the diodes are bad anymore. the outer leads read dead short, but they are insulated from the middle (about 100kohm from each side)
idk this diode is different from the ones im used to.
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Old 01-14-2012, 02:15 PM
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most likely those are good. check the transistors in the power supply.
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Old 01-14-2012, 02:21 PM
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all the power supply transistor check out
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Old 01-14-2012, 02:25 PM
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take all the output transistors out and try to power it up.
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Old 01-14-2012, 02:27 PM
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even the ones on the 4 channel portion?
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