Question about Audio Players & Recorders
These units use audio power amp IC's. Generally speaking, a failure in audio output stages relates either dry solder joints to the power output stages, or the chip itself has failed. Good indicator is to look at voltages across the chip. If they are all high, or all low, expect it to be blown. If it runs hot, same. if it has a crack, piece missing out of it, a bubble in it, tinning on heatsink tab blistering, it is blown. Sometimes, because so much of the audio stage is inside these chips, needing only millivolts to drive them, replacing the chip after initial inspection for dry solder joints is a normal approach to faultfinding. So you can assume it is blown even. If you really wante to waste some time on it, check the inputs across the bottom of the output stages for signal in. Throw the chip number up here and I will find a source for you. Anything, but please give me a better rating;) Cheers
Posted on Apr 08, 2008
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Posted on Jan 02, 2017
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