I’m looking for a schematic for the KAV-250 and have come up empty handed. I did see a post from 2007 with a hand drawn schematic of the output board. That helps. But really need the driver board schematic. I have one channel that starts making static/popcorn sounds the second I power up the amp. I can see the noise on my scope right at the input of the amp as well as the output. Very hard to isolate. Any suggestions would be great.