Brother HL-2140 Won't Feed Paper... I Screwed Something Up?

In the process of removing the solenoid pad, which was the cause of my printer constantly getting paper jams, I must have replaced some of the gears incorrectly when putting the printer back together. Now when I try to print something, the printer doesn't pick up any paper AT ALL. I'm afraid I placed some of the gears back incorrectly. I searched online for gear-placement for this printer but haven't found anything yet, which is why I'm asking for help.