a3i intermittently not working

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I own a cabridge audio A3i amplifier. I have had about 3-4 years of use out of this amp then one day it stopped working on both channels even though the power light was still on.

I checked everything was setup correctly and tried it again over the next few but no joy.

i then left it for about a month and tried it again and magically it was working, unfortunately about a month later it failed again.

Does anyone know what could be causing this?

I have limited repair experience at a component level but do know how to use an oscilloscope and multimeter and have access to both pieces of equipment.

Any help would be much appreciated as i would love to get my amp working again.

Cheers
 
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