Lexmark 4500-00 Series, Service Manual

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Diagnostic information
2-91
4500
White or black lines or bands
Toner on back of page
FRU Action
Toner cartridge (not a FRU)
Drive gear assembly 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
paper as it feeds through the printer
especially in the developer and
transfer process. Inspect the toner
cartridge and paper feed
components, especially the drive
gears, for signs of wear, debris,
binds, or damage.
Replace the drive gear assembly as
necessary.
FRU Action
Print cartridge (not a FRU) Inspect the overall paper path for
signs of spilled toner.
Gently clean the contaminated areas
with a soft cloth or compressed air.
Fuser hot roll
Backup roll The fuser hot roll can cause toner on
the back of the paper if toner is
building up on the hot roll. This
buildup may transfer to the backup
roll, later transferring to the back of
the paper.
Inspect the hot roll and backup roller
for signs of contamination and
replace as necessary.
Transfer roll A transfer roll contaminated with
toner can cause toner to transfer to
the back of printed pages.
Inspect the transfer roll for
contamination and replace as
necessary.