I don't know if this is the right thread, but I'm hoping so.

I haven't touched this amp. My dad picked it out for christmas a few years ago, blah blah blah, the drive and more drive channels don't work. I've played with all the settings, tried turning on the second and third channels on the amp itself and with the footswitch, etc.

When I switch to the channel, a buzzing starts up in the amp, but the tone of the guitar doesn't actually change.

I have a schematic for the amp, but the file is too large to attach. Has a solder joint been broke loose? I haven't been into the amp yet, because I don't know too much about circuitry. Is it something myself/my father could fix, or would I need to take it to a local guitar shop to fix because of inexperience?
Fender Squier Strat
Fender Frontman 212R
Digitech RP90.
Unknown brand of my bass.
Just take it to the shop. Usually an inspection/diagnosis is free.
I'm an electronics technician. Trust me, if you're asking us if either you or your father can fix it, that's a good sign you need to take it in for repair.