Have a DD m5 (older version) blown 1 out of 4 output sections, only about a month use on it, his hatch didn't fully close and rain and strong wind in the correct direction to wreak havoc rained in on the preamp side. Needless to say it didn't play, it didn't go in protect he said. This amp has the speaker terminals and power terminals on the same side and they were dry but the amp did blow 1 "output amplifier", all 6 fets were shorted in one way or another, only one exploded violently. I'm not seeing any evidence of water intrusion but it obviously had to have something unless rain getting on the RCAs could be the culprit? RCAs are the panel mounted style, has no pass thru "out" RCAs but does have master/slave independent terminals that did not have anything plugged into. The "In" obviously had connections so i don't foresee that being the cause. I'm looking for ideas on what to check or what would have caused just the one section to go but the 3 others are just fine and fets test the same as new on my tester (for whatever that's worth) I'm currently limited on supplies and am unable to install fets back in to test (to removed them,I cut the legs) can I check the pads to find out if anything else is potentially failed with the scope until i get my soldering gun in? Been a while since I've messed with amplifiers so I do not recall and would rather not find out on this 5k 😂
Thank you in advanced for any advice.
Thank you in advanced for any advice.
Check the gate resistors then check the gate drive signal on the gate leg/pad for the FETs. This is best done with a loading capacitor (0.1uf-0.01uf) connected across the gate and source pads for the FET location being checked.