I don't have a schematic, but if it is the same KRK 5 powered speakers I have been seeing there are a few common problems. (KRK is Gibson I think) These problems are common to a lot of these powered speakers of several brands. The most common failure is the power supply filter caps opening up. They underrated the voltage spec because of size and space considerations. You have to be careful replacing them because of double sided boards and they use the cap leads for feed throughs. You also get bad connections because those boards can get rattled pretty good inside those cabs. Most of these monitors are bi amped. I have been able to source replacement speakers and tweeters for some via MCM, but if you do that you better do it in pairs. Working on them isn't really that difficult once you get past the globs of glue on the components, lol. They really aren't that complicated, just tedious and you have to dig in. Hope this helps.