I have a p7000s amplifier that had a problem whereby it would switch off after a couple of hours. After having a look at the PS i found that the IGBTs q407 & q406 had been switched out with G4PH50UD, so i ordered some IRG4PC50U from UTsource. The parts finally came and i installed them. The amp ran perfectly for two hours then the minute i stepped out of the room it went off. When i tried to turn it on again there was a spark at q406 and it went off again. Now before I reinstall q406 I'm trying to find out the possible causes from what I had changed because there had never been a short before. Could the IGBT have been bad? Also, I used some arctic silver thermal paste that I had on hand which i discovered is slightly capacitive. So could that also have been part of the problem?
I've attached the service manual. thanks
I've attached the service manual. thanks
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