White or black lines or bands
FRU Action
Print cartridge
assembly (not a FRU)
Developer drive
coupling assembly
Main motor gear drive
Banding appears as light or dark horizontal lines on a uniformly gray page
or on a page with a large area of graphics. Banding is primarily due to a
variation in the speed of the media as it feeds through the machine,
especially in the developer and transfer process. It may also be a result of
overly dry or moist environments.
With the machine off, check to make sure that the laser beam is not
blocked.
Inspect the toner cartridge and paper feed components, especially the drive
coupler and drive gears for debris, binds, or damage.
Toner on back of page
FRU Action
Photoconductor kit (not
a FRU)
Print a menu page from the "Menu Settings Page" in “Reports Menu".
Inspect the overall paper path for signs of spilled toner.
Gently clean the contaminated areas with a soft cloth.
Fuser
Inspect the fuser for signs of contamination.
Replace the fuser as necessary.
Transfer roll
A transfer roll contaminated with toner can cause toner to transfer to the
back of pages.
Inspect the transfer roll for contamination and its cable for continuity.
HVPS or engine board
Loss of the proper high voltages can cause excessive toner to contaminate
the transfer roller. None of these voltages can be measured, but the
contacts and continuities can be checked. To check the lower voltage, see
J502 on the wiring diagram. Replace the LVPS/HVPS or controller board
as necessary.
Service Checks
257
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