Dear Experts,
I had this problem with my PC-12 recently... upon switching the power on, there are some hissing sound for about 2~3 sec then the steady loud roar will reproduced afterwards. The loudness cannot be controlled by the volume and even though there are no inputs to the sub, this problem still persists. Is my PC-12 grounded or any of the transistors / capacitors gave in? Pls advise on how to troubleshoot this problem.
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Yes, it's the humming noise thing.
How can I check which power supply capacitor failed using a multimeter?
I'm having exactly the same problem - any tips on diagnosis and fixing this?
With a circuit diagram i could start to get on my way i think - not sure if any exist?
The same problem here, as soon as I plug the power that loud roar starts right away. I once took the whole sub-woofer apart and assembled the whole thing again and it worked as a charm for ten days or so, and it started all over again. So i think it's a capacitor thing but I'm no expert, if any one knows a solution it would be nice to know.
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