Question about Pyramid 1000W 2CH SUPER BLUE AMP Car Audio Amplifier

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Pyramid PB449X In Protect Mode

I have a Pyramid PB449X 2ch. amp. I bought not working cause thats what I do, buy them broke, repair & resale. I'm an electronics tech with 2 degrees and 15 yaers experience. Just to let who ever helps me out knows my background in the eclectronics field. Anyway back to the amp. Put power to it protect light turns on immediately. I checked all the transistors and mosfets on the power supply section, everything checks out fine. I thought a main diode coming from the power hook up point was bad but replaced it and still nothing. I even checked out the small transistors and all the zener diodes and all check out. I might have miss read something when testing. So I guess I'm gonna see where the powr stop at. Trace the power till I find a spot where there is suppose to be voltage. Maybe that will lead me to it. Well, if any one can give me some suggesions I would appriciate it. I just can't think anymore of what to test. Help get amp going please.

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The protect light is a notification that the amplifier has reached a set temperature and shuts the amp down till it cools off. Look for the thermosister on the heatsink and follow the circuitry back to the control chip. Once you get that fixed the amp should power up until it gets too hot and the protect circuit kicks in. I had one of these amps for a while and the circuit was very touchy. Regards, rcampsr

Posted on Feb 21, 2009


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