Question about Alpine MRD-M1005 Car Audio Amplifier

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Amp powers on, no sound from subs

Ive had this alpine mrd m1005 for about a year and a half. it is worked the entire time up until about 2 weeks ago. the sound cut out, so i figured the power or ground was messed up. the amp actually works though. all the normal lights come on it, letting you know theres power to it. however there is no sound coming from my subs. i checked the speaker wires from the amp to the subs and even replaced them. i scanned the rca cable and it appears fine; the turn on lead is in between them and that works fine so i assume the rcas are good. what else can i check? thanks.

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  • reggin182 Dec 29, 2008

    my amp isnt in protect mode though. it has the normal sign of "14.4v", showing the voltage. if it goes into protect it puts up different signs. since its acting normal, could this mean that something else could be the problem? or can a blown output still allow the amp to function correctly? if so, which piece would i need fixed? i have an electronics guy that repairs things well so i would like to know what kind of price im looking at. this was a $350 amp afterall. thanks again.

  • Cory Wichman
    Cory Wichman Nov 07, 2014

    That's not necessarily the case (the amp being blown), though it is a likely possibility. You need to check voltage levels with a multimeter and also visually inspect the ground connection. Sometimes remote and ground alone can illuminate the power LED, even though there is no voltage at the power wire. Also, the head unit's RCA outputs could have failed, or the RCA cables could have come unplugged. You need to inspect the wire from beginning to end and ensure it's plugged in at both ends. Finally, the amp could be working just fine yet not producing any sound if the speaker wires aren't properly connected. There are speaker wires running from the amp to the speaker box. Both sides need to be inspected. With a multimeter you can test ohm load at the amplifier. Also make sure the connections inside of the box are sound. (If ohm load is present at the amplifier, then the connections are good). That's about it...

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The output is blown. It is in need of service.
There are many different ways that an amp can fail but the two most common failures are shorted output transistors and blown power supply transistors (< those are not blown). There are several types of protection circuits in amplifiers. The most common are over-current and thermal. The over-current protection is supposed to protect the output transistors. Sometimes it doesn't work well enough to prevent the failure of the output transistors but it will work well enough to shut the supply down before the power supply FETs are destroyed. If the amp remains in protect mode, goes into protect mode or blows the fuse as soon as the remote voltage is applied, shorted output transistors are almost certainly the cause.

Posted on Dec 29, 2008

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