Question about American Pro VS1403 Car Audio Amplifier

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American pro vs1403 lost one channel out of four

Im pretty sure it can be repaired but i need help, its a 4 channel amp and the other day one of the channels went out.only three work now.how can i fix the problem?? thanx

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  • Mark Skinner May 11, 2010

    Hello tertul, I agree with pbabin, he has helped me out in the past and is currently helping me with an infinity amp and it is unusual for just on channel to stop working. I know about electronics as I have a degre for an electronics tech from the mid 1990. I'm just getting back into repairing electronice and it's mostly car amps.

    But, it is possable for one channel to blow out, meaning the output transistors to short out, that should cause it to go into protection mode though. I'm not exactly sure cause I had an amp the same way and the output transistors were shorted and did'nt cause it to go into protecion mode so like pbabin said, check all connections and speaker at that channel and you head unit. Then let us know. pbabin will be able to help you better than I can at the moment until I get some more car amp repairs under my belt then I hope to be as good as he is. Good luck

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I also want to add, I just got a crossfire ct-2200 oldschool amp I bought from E-Bay and the description described it to be as one channel not working but other side plays fine. Well, when I got it took it apart did basic test everthing turned out fine. So I hooked it up turned the power on and one channel was'nt playing. I thought maybe something in the input circuit in the amp, the preamp section maybe an opamp. Anyway it turned out to be the sub frquency switch and the stereo or bridge selector switches had sirty contacts. So I sprayed some contact cleaner in them and then a little WD40 to keep them lubricated for sliding. So maybe that might help you out also. Once again, Good luck and let us know what you find out.

Posted on Jan 28, 2009

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Have you moved all of the switches, controls and RCA jacks to make sure that the problem isn't a dirty contact?

Have you tried swapping the RCA signal cable from a working channel to confirm that it's not a signal problem?

Have you swapped a speaker from a working channel to the dead channel to confirm that it's not a speaker problem?

It's unusual that one channel goes dead and the rest work.

Posted on May 20, 2008

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Posted on Jan 02, 2017

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