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Upon power up, LED barely lit up (flckrd) but did not stay lit.

After removal of the lid it was discovered a screw had come lose from the board. Located the hole and installed the screw back, but the fuse was not blown powered up with the same result...a flickering main LED. This unit is used in a mobile sound system to drive twin horns and twin Dual Super Tweeters. (stereo) Fuse Good.

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Can you please post the make and model of the unit along with any other symptoms you see?

Thanks,
Dan

Posted on Jan 16, 2009

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Upon " power on" "fault" lights blink then power unit off.


If you're happy to have a look inside the amplifier you can disconnect it from the mains (important bit), then take the lid off and have a look. It doesn't hurt to look for components that are obviously at fault, (burnt, bits missing, no longer connected to the board etc). Be advised there will be some charge in the capacitors still so don't go poking around too much.
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The picture shows the amplifier with the top removed. The box is where the old glue used to be. The glue is to hold the purple tubular capacitor steady. It is not really necessary unless you have the amp sat on top of your speakers (not recommended).
To remove the glue, unplug the amp from the mains, remove the lid (six screws), locate the area in the picture and scratch the glue away with a large needle or tiny screwdriver. The most important bit is to remove the glue from the bare wires at the ends of the resistors (the brown stripy things).
If this doesn't solve the problem, or it returns, the capacitor that determines the length of the muting period may have failed. This is a slightly less diy repair as you will need a soldering iron and a new capacitor.

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