Question about Directed 2150 Car Audio Amplifier

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Amplifier with visual damage

I've aquired an amplifier with considerable (visual) damage. No output. I am trying to find a schematic to troubleshoot. Is there one available?

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It's unlikely that you're going to find a schematic. If this amp uses the defaced ICs marked B52 and F16, it shouldn't be difficult to repair if you have experience doing repair work.

Let me know if you need help with it. If you do, I'll need at least a few photos of it so I can see the overall layout.

Posted on Apr 17, 2008

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Generally a "protect" mode would be triggered by a shorted output (speaker). I would suggest disconnection all of the speakers to see if the red light goes off.

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It probably has shorted output transistors. Most of the time, all you need to do is replace the shorted output (and those in parallel with it).

Email me if you want the schematic. It's probably not needed for this repair.

babin_perry@yahoo.com

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Many times, the output transistors fail and that causes the power supply FETs to fail.

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If you know how to check the transistors, check them to determine the severity of the damage. If you don't know how to check them, read through the following page following all links provided.

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The schematic is available from Rockford.

It's possible that the outputs have blown. They generally short from the center leg to the third leg when they fail.

Unless you have experience working with the MEHSA insulators, you may want to buy the entire MEHSA strip from Rockford. You can replace the transistors on the insulators but you have to use a torch to heat the strips.

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what are the resistors connected to? mosfets?if so you need to identify which pin gate or source,these amps have dual so the other side would be the same.

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