Question about Alphasonik PMA1200D Car Audio Amplifier

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Protection Light I installed a new capacitor into my amp and then all of a sudden the protection light comes on. What did i do do wrong.

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When the protection light comes on means either you have something like you power and bround backwords,or you have speaker wires touching somewhere..

Posted on Dec 04, 2008

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it shouldnt cause it flash the protection light but you are correct in thinking they have wired it wrong ...

the ground of your amp should be grounded to the metal of your car not the battrie ....

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Eith some wires touched, you dont have big enough fues or you have somehting hooked up wrong

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the amp is going into protect mode due to something wrong in the amp or some thing in the wiring to it ooh yea if you are getting 18v power to the amp that is way to high it should not be higher then 15v if the amp is in protect mode it will not play at all.

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It probably has shorted output transistors. To eliminate other possible causes, read through the following page.

Amplifier in Protect Mode - Troubleshooting

Let me know if you have any other questions.

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2 Answers

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You need to check the DC voltage across the B+ and ground terminals. You also need to check the DC voltage across the remote and ground terminals. If the voltage is less than 11 volts, you need to check the B+ supply and remote wiring for breaks or open fuses. You should also check the ground connection to confirm that it's not loose.

 

If the voltage is OK, the output transistors are likely shorted.

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Disconnect your subs from the amp. If the lights go out then your sub is blown and is putting the amp into protect. If the lights keep flashing even with the subs disconnected than the Amp is toast.

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If the amplifier goes into protect when there are no speaker wires connected to the amp, the amp is likely defective. The most likely culprit is shorted output transistors. If it's new, return it to the place of purchase for repair/replacement.

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