SOURCE: Put wrong power adapter into a Yamaha DTXPRESS IV
You should immediately quarantine what you plugged in and compare it to the correct one.
IF you put too low aq voltage of the CORRECT polarity nothing should have happened.
If you put backwards polarity of any voltage the regulator is probably fried internally and possibly an input bypass cap. Also if you put an AC adapter and it wants a DC the same destruction could happen.
if you put too high a voltage, possibly the power input cap may be bad.
It appears that the correct supply is the PA3C which is a 12 volt, 700ma with positive on the center pin.
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