Question about Pyramid PB845X Car Audio Amplifier

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Pyramid pb8 45x amp bein an ass

Hi my pyramid pb8 45x amp keeps jumping onto protect we compleatley disconnected pre outs no joy changed pre outs no joy removed no joy checked fuses earth live feed remote feer its not got wet and it has neva got hot its running 2 sony explodes has neva protetected its self befor if u have any suggestions please e-mail me asap much appreciated chris cliffeysrx50@hotmail.com

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Dear Cliffey18

I think you have to change protection diodes,Sometimes they seem to be ok when not load but when the power gets in they change the behavier or it can be the regulator ic which is fualty.........

I hope your problem is gonna be solved
thank you

Talkinghorse

Posted on Feb 02, 2008

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Too much input, lower the volume of source.

Posted on Feb 02, 2008

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Posted on Jan 02, 2017

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Amp fuse 30a keep blowing


You have possibly melted a couple of wires together along the radio circuit. Also the radio unit itself has 1 or more protection fuses actually inside the unit that have blown, usually at back of unit in little bay near the wire clusters.
Check your relays too, a blow out through jump starting can do all sorts of little burn-outs.

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Check your fuses.

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We installed the amp with more than enough gauge wire, and a fuse. and after resetting the ground strap we got the amp to start working after about 3 minutes at medium power we was adjusting the sound via...


Hi,
In car audio always make sure that you are feeding your amplifier with the voltage that it requires, usually 12v to 14v (some amplifiers can do 12v to 18v). If you have a voltmeter, check your voltage reading if its reading 12v above, if it reads 11.9v below & just stays there & keeps on going down then your problem is with your voltage.
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Hope this helps your concern. Have a blessed weekend.

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Pyramid PB449X In Protect Mode


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

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There is some way to change a protection (fuse?). No. The fuse usually was not broken. How long did your amp turn on?
3 seconds (DC protect) OR immediately shut down (Over Current protect)? How to confirm?
1.Unplug the amp.
2.Remove the metal cover.
3.You will see a long vertically installed pre-amp board mounted next to those large power transistors fixed by 12 screws on a large aluminium heat sink.
4.Remove this long vertically installed board mounted by 2 screws.
5.With 2 screws removed, just pulling this board out and hold it with one hand.
6.Plug the amp and switch it on.
7.If your amp stays ON forever, the problem is from this long board.
8.If switch off at once, the problem is from power amp board.
Try the above- mentioned steps. I will tell you what to do next. Just search you tube for SR600 cap replacement. I have written an email here. Write an email to me if you want to fix this amp.

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My amp turns on and off


Sounds like there could be a short somewhere. Check to make sure that there aren't any (exposed/bare) wires touching each other or if there is a bare spot of wire touching something metal. Check both ends of all the wires. A speaker wire may have come lose and is shorting out against the frame or some other place. Usually if it goes straight into protection mode or you're popping fuses you have a short somewhere. I assume the capacitor you installed is somewhere on the power line, which would be for helping with
noise. You can also try disconnecting your amp from your stereo and see what happens but leave the speakers connected, you don't want to run the amp with out a load on it (the speakers). If your amp doesn't go into protection mode when the stereo is disconnected, then you have a problem with the stereo and not the amp, assuming you already checked for any possible shorts first.

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