DB Drive WDX3K has a nasty turn on pop. And a slight turn off pop. When amp came in, it had shorted outputs, damaged drivers. The gain was full blast and the lpf was all the way down, lol. Not sure if the cranked gain might have damaged something else.. it's running fine aside from the turn on/off pop. is there something I can do to make it fix the problem or make it better? Owner said it did it before the repair... but ya... it's a nasty startup pop.
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Good afternoon Perry. I assume it must be one of these transistors on the output card... or maybe over here? I haven't worked on one of these before. I'm not certain which one is the mute transistor. Is there an easy way to trace to it?
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Ok... I replaced Q21... and it still makes pop noise. I have the following readings on Q21. "2T" transistor. base = 12.86v, collector = 0.017v and emitter = 13.08v referenced to the main ground, while amp is playing. Unless it's not the mute transistor. He's on his way to pick it up, says he doesn't care about the thump... I'm just trying to get it better before he gets here,
I'll have to look over the schematic.
I'll have to look over the schematic.
That's the problem. If you see this again, determine why the voltage isn't going from 12v to ground. The circuit is fairly simple. The equivalent of Q21 (if the circuit isn't identical) pulls high and then turns off which allows a resistor to pull the mute pin low and enable audio.
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