Question about Phase Linear UPA424CS Car Audio Amplifier

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Amp is in protect mode, green light is on.

Green lt is on and the red power light is not. I have troubleshot it in every which way leaving me with the amp only. Its a phase linear pl200 200 watt bridgeable 2 channel mosfet amp. Where the bleep is tech supp. how do I troubleshoot internally?

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If the amp is going into protect, it likely has shorted output transistors. To eliminate other possible causes, read through the following page.

Amp in protect mode - troubleshooting

Let me know if you have any other questions.

Posted on Nov 30, 2008

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on some amps there is a duel light. red and green usually. red means it is in protect mode or you didn't hook up your remote wire. if in protect mode, it could mean a number of things. did you hook it up with speakers and everything?

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its going into protect mode, meaning there is either a short in one of the transistors
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What does the red and green light mean ???


red and green light? there is most likely a protection and a power light. The red I assume would either be a protection light or a clipping light signal. Does the amp kick off then these lights kick on red then to green?

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The red light comes on for a while and then it turns off but no green light come on


Disconnect all speaker connections and rca cables. Leave power, ground and remote wires intact. Try turning on again. If you still have a protection light your amp is faulty. Hopefully you have warranty D .A thumbs up would be greatly appreciated if this answer is helpful to you. red-light-comes-while-lv2kkrmxrai4iihdvw4m3np2-2-0_0.jpg http://www.nitrobmw.com/

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Havin problem with a1200 class a/b amp it ligts green and red at same time after hooking in remote how doi fixdo i need diagram to fix


Make sure you don't have any shorts on your speaker wires or rca cables. Unplug one at a time, the turn on power until it stays green with no protect light, then you know what input is causing the short. If you remove all speaker wires and rca wires and all you have connected is the ground, power(12volts) and remote and it still lights up red/green(in protect mode) then your problem is the amp.

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Green light (protection mode) on, NO red light (ready)


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there are 2 reasons for it to be going into protect mode 1 is heat 2 is the load on it. if it is going into protect mode soon after it starts there is a problem with the speaker. if it is after it has been on for a while it is that the amp itself is overheating. hope this answers your question

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1 Answer

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1 Answer

How to change the Red Protect light to Green Power.


If the amp goes into protect mode, it's likely due to shorted output transistors. To eliminate other possible problems, read through the following page:

Amp in Protect Mode - Troubleshooting

If the problems are not with the wiring, follow the link at the bottom of the page to the Amplifier Repair Primer page.

Let me know if you have any other questions.

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