Question about Infinity 7540A Car Audio Amplifier

3 Answers

On and off

It was hitting a loud note and just cut out. i noticed that the power light blinked off and on and my speakers were moving in and out very slowly in opposite directions. i have a protect light and clip light and power light, and just the power comes on for a second, every five seconds and a bit of sound comes out. help please

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  • nrh06002 Oct 22, 2008

    no just the power light blinks on every five seconds and it sound come out

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Are the speakers that are moving oppositely in the same enclosure with no divider between them? If so (and assuming they were originally wired in phase properly), then one of them may be blown and causing the amp to short and go into thermal protect.

(In theory, with the power-on low-frequency "bump", the speakers should move in the same direction, so moving oppositely, if sharing the same airspace, could mean only one is working).

Unhook all speakers connected to the amp at the amp end, power up the system and see if the amp stays on with all power lights in their normal mode.

Posted on Dec 03, 2008

You need to confirm that the voltage on the B+ and remote terminals of the amp are remaining at or above 11v. Place the black meter probe on the ground terminal of the amplifier when measuring the voltage. Let me know what you find.

Posted on Oct 23, 2008

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Are any lights on?

Posted on Oct 21, 2008

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Hi.
Take the input leads out of the amplifier for a start, but leave the power and remote cables connected.
See if it still turns on and off. If still faulty, you have probably blown a power transistor inside and the amp is shutting down when the output rises each time. It will almost certainly need looking at. Also make sure you are running into the correct impedance load. If you have hooked up too many speakers you will cause damage.

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