...wrong foot to start with as this unit does NOT have a polarity since it REQUIRES an AC adpter, not a DC one. What you have WILL NOT WORK. If you have connected it, it should NOT have caused damage, ...
wrong polarity supply was used, then maybe only a diode was damaged. This would be a cheap fix. But more than likely it knocked out one of the large surface mount IC's that us techs don't even dare to
...adapter. Most mixers are pretty well protected against using wrong adapter. Many require an AC voltage input rather than DC and use of a DC adpater will not damage one unless the voltage is very
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