Supply I used was +/-12 +5, Mixer works fine with that. Tied the digital and analog grounds together and to power supply ground, No hum. Pulled the power supply and amp completely out, Added a switching power supply instead, The ribbon from the mixer unit isĤ +48 ( Needed for phantom only) I did not use it.(black)
I modded a few pmp3000's that are working fine.
Since the built in amp is pretty much a joke to start with I really would not use it unless maybe for one monitor speaker on karaoke to be honest, Run external amps. I repaired a few of these and so far every one had power supply damage along with the amp so Amp only did not solve the problem, Power resistors r11 and r12 take a beating anlong with Transistors T4 and T3, All of mine the resisters opened and the transistors shorted, Amps were just replacing the output drivers.
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