rags Posted November 11, 2009 Share Posted November 11, 2009 Hi, I have a Kustom KPM4080 PA that I have been having problems with. It's this one pictured below: A friend lent it to me so I had something to use for practicing with the boys. However it recently stopped working right, and I'm not the in financial situation (see: college) to be throwing down the cash for a new one. I know it's not a high quality unit, but I'm hoping there's something I can do to fix it. It will power on, but no sound will come through any of the channels. If I unplug it and plug it back in, it will power on and work fine for a few minutes but will then suddenly go mute again. I took it apart and poked around to see if anything was loose or something and hit it with some compressed air, and when I put it back together it was doing fine for about 20 minutes...but then it went quiet again and I had to once again unplug it to get it to make a meager few minutes of sound. I am currently only running one microphone into this. Does anyone have any suggestions about what to do to remedy this problem? Quote Link to post Share on other sites
BreezyGrass Posted November 12, 2009 Share Posted November 12, 2009 Take it to a pro - unless you are studying electricity in college. Even while unplugged there are capicitors that hold power and can fry you. Good luck with it. Quote Link to post Share on other sites
In a little rowboat Posted November 12, 2009 Share Posted November 12, 2009 A few possibilities...one is you have a massive ohm mismatch with the speakers you are running, causing the amp to overload/freak out, possible the reverb circuit is going bad and killing the dry signal, muting output...possible a speaker jack/s going bad or shorting, or a bad mic cord (did you swap cords?)...hard to tell without inspecting myself...i think if its none of those things, youll be looking at getting a new one, because what youll likely pay in repair/labor is close to the cost of a new unit of that type...it could be a transformer going bad (which could come from, i dont know, a speaker ohm mismatch) which is the kiss of death in a solid state device like this one, the likelihood of a cap having deadly loads is not high...that is more common in tube amps with polar filter caps...however not a reason to not be very careful what you touch... good luck, ask any specifics you like...ive been there j Quote Link to post Share on other sites
BreezyGrass Posted November 12, 2009 Share Posted November 12, 2009 You are correct. It is more with a tube amp that the problems with caps retaining power. I still am weary of opening up an amp when I don't know what I'm doing. Quote Link to post Share on other sites
rags Posted November 14, 2009 Author Share Posted November 14, 2009 I feel like it is likely either a problem with the ohms or the reverb...luckily I just found another small powered mixer on craigslist for cheap, so I guess it's time to just bite the bullet and get rid of this thing. Quote Link to post Share on other sites
In a little rowboat Posted November 15, 2009 Share Posted November 15, 2009 well...i mean it might be an easy fix...at least have someone look at it...provided theres no labor charge... Quote Link to post Share on other sites
jff Posted November 17, 2009 Share Posted November 17, 2009 I have a similar PA, made by Peavey. It died on me, none of the inputs produced sound and I brought it to a shop for repair. Turns out the input jacks just needed to be resoldered. It's apparently a common problem with Peavey and, I assume, other lower end pieces of gear as the inputs don't have shock mounts. It was a $30 repair and it's been working like new ever since. Maybe even better than new. Your symptoms seem to be a little different than mine were, but you might get lucky. I'd definitely have someone look it over before buying a new one. Quote Link to post Share on other sites
a.miller Posted November 23, 2009 Share Posted November 23, 2009 Check the fuse. Funny what problems a $.10 piece can cause. Quote Link to post Share on other sites
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