Question about Car Audio & Video
It's likely that the amplifier has shorted output transistors. To eliminate other possible problems that can cause an amp to go into protect, read through the following page.
Amp In Protect - Troubleshooting
Posted on Jul 31, 2008
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Posted on Jan 02, 2017
Tips for a great answer:
There is the slighest chance that a common control may have developed a high-resistance or 'dead' spot and is causing your symptom. Turn the POWER OFF and operate every control throughout its range a number of times, especially rarely-used ones like Tape Monitors and the Mute control.
If it still doesn't work you might want to prove if its a low-level signal issue or a high level amp failure. One way would be to run an RCA cable pair from the Tape Out to any other device (even a TV) you might have that accepts an audio input.
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