Question about Alpine MRD-M1005 Car Audio Amplifier
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.
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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Posted on Jan 02, 2017
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