Question about Legacy BLUE 4 X 250W CAR AMP Car Audio Amplifier

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Falty Amplifier? When I turn the power on in my car, the amp switches from the green "power" light to the red "protected" light. I checked all the wire connections and they all seem fine. I hooked everything up a few weeks ago and couldn't get the system to work. I hooked it up again a few days ago to test it and it worked just fine. I turned it off for about an hour and it qwouldn't work again and still hasnt worked since. I'm not sure but I think something is wrong with the transistors in the amp itsefl because It still went into "protected" when I unhooked the speaker cables.

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Re: Falty Amplifier?

It sounds like the output transistors have shorted. This is VERY common. If you want to try to troubleshoot the problem, I'd need to see photos of the inside of the amp. You'll need a multimeter to check the transistors.

Before opening the amp, remove it from the power source.

Since the resolution is severely limited here, send the photos to me directly ( If you're going to send multiple photos, please zip them and send one file.

Posted on Dec 21, 2007

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The red protect light is coming on

It is possible that your amp is going over the threshold limit of draining current to give out the protect signal. What could be done is to first checkout if your speakers are loading the amplifier, check the rating of the speakers and the impedance, must not be too low.below 2 ohms. Now check the source signal if this is bringing in any transcient signals to power out the outputs particularily high/low freq. So decrease off your bass and treble to mid position and test again. see if there is any improvement, if so there could be a filter problem with your set. Connect an external source and see if the amp powers better , in such case check for fault in cables, input lines and ground with in the set. Repeat this and check. Hope this helps you out. Good day

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How to switch protection off (red LED to blue)

The protection light is on indicating a short or over- voltage problem. If you disconnect the speaker leads and the light goes off or green then the problem is a shorted speaker or wiring problem. If the light stays red the problem is inside the amp and it will need service and parts.

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Red light comes on for a few seconds

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Power Protection Light Will Not Switch Back to Green

Disconnect all speakers, then turn the amp on. If there is no internal problem with the amp, it will go green. If it does go green, reconnect your speakers one at a time with the amp off then turn it on. when you connect the speaker that's causing the problem, the amp will go into protection. At this point, it's one of two things, a bad speaker wire (screw thru it or touching another terminal) or a bad speaker(burnt voice coil) to test that wire, disconnect the wire at the speaker and turn on the amp, if it's still green, all's well in the wire department. Meter the speaker with a multimeter on resistance, if it's blown the meter will read 1.... If you don't have a meter, connect the speaker that's having the problem to the other channel and test again, if it goes into protection, you've got your answer. Bad speaker. Hope this helps

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1 Answer

Red protection light is on constantly. the light won't turn green

is the remote source have enough amp to triger amp seem like that is you prob and chk you spk wire and rca too-

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1 Answer

Protection Light Comes on

your amp isnt getting enough power to it you may need to install a compacitor unit

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Amp Power light will not go on. Protection light is lit- Thump sound in speakers

It probably has shorted output transistors. To eliminate other possible causes, read through the following page.

Amplifier in Protect Mode - Troubleshooting

Let me know if you have any other questions.

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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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2 Answers

500.1 amp power lights blinks on and off

Protection mode; follow this link to get a manual for the amplifier:

Below information is from the manual:

Status Indicator Lights / Protection Circuitry
There are three status indicator lights on the top of the amplifier. These are as follows:1) "Power" (Green): lights to indicate that the amplifier is turned on and operating normally.
2) "Thermal" (Red): lights to indicate that the amplifier has exceeded its safe operating temperature, putting the amplifier into a self-protection mode, which reduces the power output of the amplifier. The red light will shut off and the amplifier will return to normal, full-power operating mode if the heat sink temperature drops back to a safe level.
3) "Low ω" (Amber): lights to indicate that the impedance of the speaker load connected to the amplifier is lower than the optimum impedance load range for the amplifier. When this light is on, a protection circuit engages and reduces the power output of the amplifier. The amber indicator will also light when a short-circuit is detected in the speaker wiring (this can be a short between the positive and negative speaker wires or between either speaker wire and the vehicle chassis).
There is only one condition that will shut down an undamaged 500/1v2 completely… If battery voltage drops below 10 volts, the entire amplifier will shut itself off. The green "Power" indicator on the top of the amplifier will turn off when this occurs. The amplifier will turn back on when voltage climbs back above 10 volts. This may happen in a rapid cycle when bass-heavy program material causes a weak charging system to dip below 10 volts momentarily. If this is happening in your system, have your charging system inspected to make sure it is working properly.
For information on troubleshooting this amplifier, refer to Appendix E (page 21).

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My Power Protector Light wont turn Green

switch off the amp then take off all the wires off including the speaker wire and then reconnect the wires on like before the problem is that the amp is on protection and if that dont work then get it repaired another thing is make sure ur amp fuses havent blown.

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