Lexmark E250DN - Govt Laser 30PPM Special Build Mono Taa Service Manual page 73

Light print
FRU
Toner cartridge (not a
FRU)
Transfer roll
LVPS/HVPS card
White or black lines or bands
FRU
Print cartridge
assembly (not a FRU)
Developer drive
coupling assembly
Main gear drive
Toner on back of page
FRU
PC Kit (not a FRU)
Fuser
Transfer roll
Action
Make sure the toner cartridge and PC Kit are installed correctly and that the toner cartridge
is not low on toner.
If the problem continues, install a new toner cartridge.
Recheck condition before replacing PC Kit, if necessary.
Check the transfer roll for signs of toner buildup and contamination.
Inspect the HVPS contact (transfer roll) for contamination.
Verify the high voltage cable is plugged into the LVPS/HVPS.
If all components appear free of contamination, replace the following FRUs one at a time in
the order shown:
• Transfer roll
• LVPS/HVPS card
Action
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 printer, especially in the developer and transfer process. It may also be
a result of overly dry or moist environments.
With the printer 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.
Action
Print a menu page (press and release
settings for media type.
Inspect the overall paper path for signs of spilled toner.
Gently clean the contaminated areas with a soft cloth.
Inspect the fuser for signs of contamination.
Replace the fuser as necessary.
A transfer roll contaminated with toner can cause toner to transfer to the back of pages.
Inspect the transfer roll for contamination, and replace as necessary.
when the printer is in ready state) and check
Diagnostic information
4512-220, -230
2-49