I just came upon a Vox Pathfinder 10 on Craigslist for $20. Seller said it just quit and needs to be fixed. I'm new to electronic and still trying to get my feet wet. I figured this would be a great starter project.

Any help would be awesome. So I've checked the fuse and it doesn't look blown so I've moved on to check the on/off switch and the power cable. I just bought a mulitmeter to check voltage but I'm still unsure what I'm looking for.
1. Should I be on AC or DC when checking voltage on a solid state amp?
2. What voltage am I looking for when checking the on/off switch?
3. What voltage for the power cable? It splits into 3 cables when coming into the chassis. One ground and two other cables. Do I test the two non-ground cables?

Sorry for the newbie questions. Any help?