My sub amp is a Memphis 1000D. Has been an awesome amp, and has worked flawlessly for a couple years; I run it 2ohm mono (stable to 1ohm mono).

One day, it just up and dies. Power/ground/remote all good. But the power light doesn't kick on, and no sound from it.

So, I pull it out of the car, and hook it up to my test battery (which is putting out 12.5V). Whenever I hook up power and ground, the protection light blink on for about 3/4 of a second, then turns off, not to come back on unless I remove either power or ground, wait a few seconds, then reconnect them.

If I take a wire from +12V to the remote terminal, the protection light will again come on, for about 1/2 a second, then after waiting a second, you can hear the internal relay kick on, and it doesn't kick off until you remove the voltage from the remote terminal. Yet the power light never comes on.

Both 40V fuses are good. Pulled both, and that caused the fuse fault light to come on, so obviously that circuit is working correctly.

I pulled off the bottom cover; nothing looks loose, damaged, or burned. I don't have the wiring diagrams or the proper tools to diagnose this problem. I know "take it to a shop" but I have no money to put into the car, and if I did, it would be going to something else. This needs to be a free or near free fix; otherwise it will sit on a shelf for a while. Any ideas would be appreciated.

 

Try posting on this messageboard: http://www.caraudioforum.com

There may be someone there that can give you some ideas of what to look for. Sounds to me like the power supply is gone.

 

Amps are usualy fairly easy to troubleshoot if you have access to a hand held meter with Diode test capabilities.

I have not repaired a lot but what I have typicaly seen is maybe a diode bridge in the power supply as mentioned above or one of the output transistors.