Archived from groups: rec.games.pinball (More info?)
I've done lots of googling on sys 11 speaker hum/buzz but my Diner
seems to have it in the extreme... it's quite loud and annoying. The
humming changes with the volume (gets louder if I turn it up), and is
coming out of all the speakers (panel and cabinet). If I unplug the
speakers at the sound board the humming goes away completely as I
would expect. Grounding braid has continuity all the way around and
sound board is properly grounded.
When the speakers are unplugged the power supply makes a humming sound
that is very much the same "frequency" as the humming from the
speakers so am wondering if that could be the source. I recently
converted it from 220v to 110v, not sure if that could have anything
to do with it, or if perhaps I got the polarity backwards (if such a
thing is possible).
Any ideas?
I've done lots of googling on sys 11 speaker hum/buzz but my Diner
seems to have it in the extreme... it's quite loud and annoying. The
humming changes with the volume (gets louder if I turn it up), and is
coming out of all the speakers (panel and cabinet). If I unplug the
speakers at the sound board the humming goes away completely as I
would expect. Grounding braid has continuity all the way around and
sound board is properly grounded.
When the speakers are unplugged the power supply makes a humming sound
that is very much the same "frequency" as the humming from the
speakers so am wondering if that could be the source. I recently
converted it from 220v to 110v, not sure if that could have anything
to do with it, or if perhaps I got the polarity backwards (if such a
thing is possible).
Any ideas?