Question about Alpine MRD-M501 Car Audio Amplifier

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Alpine mrd-m501 mono power amplifier

I dont know what is wrong with this amp there is no power light even turning on i have power coming from my batt i put a new remote wire on and the groud is good there are no signs of any kind that would tell me that the amp is fried fuses are good actualy taking them of was hard and it was like there was a factory seal couse they sounded like they have never bin takin off if you could trie and figure out what my problem is that would be so apriciated thank you so much for your tome

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Re: alpine mrd-m501 mono power amplifier

OK, It looks like you may have an internal problem. I must say from the begining if you do not have a background in electronics take the unit to a qualified service center. Now it sounds like you could have a power supply problem if you have power coming in onpen the unit and with the use of a schematic find the main voltage rail and test from there each test point and make sure it matches the schematic value. Look for burnt circuit tarces nad if you find the remove them and jumper with re-trace wire.

Posted on Sep 16, 2007

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Ok i got a mtx 12' 500 sub matched to a alpine mrd-m500 mono amp. The deck powers the 4 speakers, as i turn the volume up on my deck (alpine cde 100) the sub/amp cuts out at around volume 20-22 and E-3...

Sorry,after rereading your problem,I gave a wrong answer.Do you have the deck sub RCA pre-amps connected to the amp,then the wires from the amp to the sub?If you do,you need to check what the sub and amp are rated as such as,peak or rms.They are 2 completely different meanings.Greg

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Well it sounds like the safety switch is turning on. Which means it turns off. If you could clarify that would be awesome and i'm sure i or someone else could answer you better

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1 Answer

How to unlock my alpine mono power amplifier mrd m500?

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Try switching the lowpass filter down to 80hz or lower, then adjust the bass boost to your liking.

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Disconnect the speaker wires from the amp, then try it again. If the error message doesn't appear, try connecting the speaker wires back to the amp one by one.

The error message is due to some sort of overcurrent in the amp. If the error does not go away when the speaker wires are disconnected, the issue is most likely with the amp itself and will need professional repair.

Mar 18, 2008 | Alpine MRD-M501 Car Audio Amplifier

1 Answer

Alpine mrd-m500



Could not find exact, but close manual.  It is the MRP-M450 mono block amp from alpine.


Go to this url and view in Adobe. Print it if you need to

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