Hello all, I have a Hifonics Zeus 1800.1 D amp that started giving me issues a while back. I'd notice my sub would cut out at lower volumes. I'd need to turn the volume up pretty high to give a "kick start" and then it would play fine, even at high volumes. I decided to take the amp apart and investigate. I found a resistor just near the speaker terminals that was blown (it was a 2.2 ohm resistor, replaced with a 5w after I found it was acceptable to go up in wattage with these resistors.) Now the issue has seemed to morph, the amp is turning on and the sub will play almost every time, but it will every now and then cut out at low volumes. However, when I play at medium volume, there seems to be no issue at all.. but when I crank it up (to levels in which I've been able to play at without distortion) I can hear distortion in the sub. I've tried this on three separate subs, so I don't think its a sub issue (unless they are all damaged?)
I've tested all the fets for shorts and they seem to be good. I do not have a scope so I can't see if it's producing a square wave or not, but the power supply was putting out the proper voltage to the rectifiers when I checked them. I'm thinking maybe its something on the drive card? I think it's the 1d and p2d transistors that go bad, do y'all think it could be these? I'm kinda lost here.
I will add that when I was testing components, my filter caps (I think this is the proper name, it's the 4 blue capacitors closest to the power terminals) were presenting a short when I tested with the multimeter, is this normal? It showed a short across all of them, which made sense because I think they run in parallel, so if one is bad then they will all test bad? The other larger caps (in the middle) would beep for a second, then stop (which I believe is normal).
I've tested all the fets for shorts and they seem to be good. I do not have a scope so I can't see if it's producing a square wave or not, but the power supply was putting out the proper voltage to the rectifiers when I checked them. I'm thinking maybe its something on the drive card? I think it's the 1d and p2d transistors that go bad, do y'all think it could be these? I'm kinda lost here.
I will add that when I was testing components, my filter caps (I think this is the proper name, it's the 4 blue capacitors closest to the power terminals) were presenting a short when I tested with the multimeter, is this normal? It showed a short across all of them, which made sense because I think they run in parallel, so if one is bad then they will all test bad? The other larger caps (in the middle) would beep for a second, then stop (which I believe is normal).
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Just ordered a brand new sub, installed and tested at lower volumes.. it still cut out randomly until I cranked it up a bit, so I know it's a problem with the amp.. going to have to wait until I can make a drive to see if it still distorts at high volumes.