HP 4100 printer, is this a bad toner cartridge or roller kit?

Hi everyone. I'm ready to do the last fix on the hp 4100. Looks like I fixed the mangled paper problem. I managed to pull a loose 1/8" thick 1" square piece of black plastic out of the printer. So the paper path is looks right now. The last problem is a print quality problem. The left 1/2" of the page prints strangely with some ghost images, from higher up the page or the last page, copied every few inches down the page. This sounds to me like the toner drum, but since I don't know exactly what the roller kit is for, I'm not sure if that's the problem. Is the toner not coming off of the drum and on to the page? Or is the drum supposed to be cleaned off with something between pages and it's not? Any ideas what's happening? brian