Here your problem.
The imaging unit creates the image using an electro-photo process. The imaging unit consists of the following:
■ An OPC Drum
■ Waste Toner Assembly
■ Charge Roller Assembly
9.0 Consumables, Routine Maintenance Items and Options
Item Life based on 5% coverage Part No. Replaceable by
Black Standard Toner Cartridge
Black High capacity
Cyan Standard Toner Cartridge
Cyan High capacity
Yellow Standard Toner Cartridge
Yellow High capacity
Magenta Standard Toner Cartridge
Magenta High capacity
Imaging Unit 50,000 images 108R00593 User replaceable
Transfer Belt 50,000 images 108R00594 User replaceable
500-Sheet Feeder N/A 119650600
Waste Toner Cartridge 3,000 to 5,000 pages (color 5%) 106R00683 User replaceable.
Your imaging unit may have exeeded it life of 50,000 pages and will need to be replaced.
Hope this helps
on May 22, 2012