Not many amplifiers will illuminate the protection light when the fuses are blown but a few will so you need to check this. The first thing you need to check is the on-board fuses plugged into the amplifier (if it has them). If you don't know how they're supposed to behave, ask around. If your amp is working properly, pay attention the way the indicators light up when powering the amp up. It's helpful to know how the amplifier behaves when working properly. Sometimes, a VERY brief drop in voltage (too short to be seen on a standard multimeter) will cause the amp to shut down for a short while.Īgain. This happens when the voltage drops too low when the amp is being driven hard with an insufficient power supply. There are a few amps (some JL Audio) that will go into protect and none of the indicators change. This is especially true when the power supply has failed. In MANY amplifiers, the power LED will be lit but the amplifier will be completely dead internally. Some (like the old Autoteks) light the green LED and red LED initially then the red LED switches off. Sometimes it switches the red LED off and switches the green on (Planet Audio, Power Acoustik and similar amps). Sometimes it's a single LED that changes color (PPI). Many amplifiers show protect when initially powered up (mute delay) and then switch to green. When there is a fault, the LED changes from green to amber. The lights are always lit when the amp powers up but are normally green. For example, some of the Sony amplifiers have lights for power, overcurrent and thermal protection. Some amplifiers have multiple protect lights. Look at the silkscreen on the amplifier to confirm the function of the LEDs. Generally, the power light is green or blue and the protect light is red but on some amps, the protect light is green and the power light is red. If the power light blinks then goes off, the amp is either going into protect mode or there is a bad connection in the power supply wiring. Some simply shut down and the power light will not illuminate when in protect mode. Not all amps have a protection mode indicator. This is common on older Alpine amplifiers. The owner's manual is the best source to help you decode the blink sequence. Many times, the protection indicator will blink to indicate the reason the amp is in protect mode. For the most part, this page is for amplifiers that go into protect mode and remain in protect mode or go into protect mode when the amplifier is driven hard. If you are unsure about this, you can email me or ask someone on a forum where they're familiar with the amplifier you have. If you know how your amplifier behaves when the amp is in good working order, it will make troubleshooting much easier. Other amplifiers ONLY illuminate the protect LED when there is a problem. After a short delay (2-10 seconds), the protect LED will go off. Many amplifiers will illuminate their protect LED during the mute delay (when you initially power up the amplifier).
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