I have a friend hifonics I told him I would look at and since I'm stuggling with other amps at the moment I took a break from them. I thought this was just a power supply issue. But one half of the output are reading a short? But as I'm taking them out they are all testing fine? Next I'll test the pulldown/gate resistors. Anyone seen this or know what it is?
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Found it perry, just happened to be the very last transistor I pulled, a capacitor shorted to the casing taking down the output which brought down the power supply. I removed everything burnt or shorted and replace the gate driver transistors and gate resistors. Got it up and running.
This is NOT the value you need but I ordered these for a similar amp/application. If the size it right, buy the 6.8k that you appear to have.
667-ERG-3SJ392 (mouser)
667-ERG-3SJ392 (mouser)
That's exactly what I needed perry thanks. The 6.8k I received are very enlongated, I could make them work but I rather it look OEM. Thanks.
Everything seems fine without the recifiers installed as soon as I added the rail voltage to the curcuit it drew current.
Found some of the pchannel transistors to be leaking. I'm just going to replace the entire section. I'll reposgnon the outcome.
I've found a very high failure rate for output FETs in class D amps when they were in the amp when it failed. Many check OK but fail when the amp is driven hard. Sometimes they even fail at low power. Most output FETs are inexpensive and it's not worth risking the amp failing again (which could cause extensive damage if the supply fails).
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