Troubleshooting Pioneer SW-8MK2 Subwoofer

CutRateGamer

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I purchased my Pioneer SW-8MK2 subwoofer in 2017. It is hooked up to a Denon AVR-S720W. For the most part, it has worked without issue. Occasionally, when the base would get really thumping during a movie the subwoofer would not stop firing until I unplugged it from the wall. Lately, I run into that issue with almost every movie. In addition, turning the volumne knob on the back of the sub seems to have no effect. Is my sub busted?

Thank you for any help you can provide in diagnosing the issue. I know very little about speakers.
 
I have a friend with one of these subs that is intermittent, I need a schematic to troubleshoot it. Anyone know if they are available anywhere? I'm a EE (retired but still do some things) so I'm pretty confident in repairing electronics.
Would appreciate any help!
 
Does anyone have a schematic for a Pioneer SW-8MK2 subwoofer.
I am blowing the on board 1 amp fuse.
 

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