Dirty optics. 2 Screws on the right side of the copy glass. Remove plastic glass holder. Remove glass. Remove black box-4 screws. Clean all mirrors. Replace in reverse order.
CAUTION: This is live AC voltage. Un-Plug! This will clean up any shading unless like the previous post said the Drum, or Heat Rollers are shot.
Courtesy of http://www.Tonerovernight.com
Bill T., March 2007