Lexmark M410 - Optra B/W Laser Printer Service Manual page 70

4045-XXX
Print Quality - Banding
Service Tip: Banding is difficult to detect except on a page with a
uniform gray or a large amount of graphics printed on the page.
Banding is primarily due to a variation in the speed of the paper as it
feeds through the printer, especially in the development and transfer
process. Inspect the alignment assembly, main drive assembly and
all other paper feed components for signs of wear, dirt, binds, or
damage, especially the drive gears. Banding appears as light or dark
horizontal lines on a uniformly gray page.
Print Quality - Black bands on outer edges of the page
This print quality problem appears as vertical black bands on one or
both sides of the copy and can be wide, narrow, light or dark.
FRU
1 Charge Roll Linkage
Springs
2 Charge Roll Assembly
Charge Roll Link Arm
2-44
Service Manual
Action
If the problem is just on one side of
the page, check the charge roll
linkage spring on that side. You can
check to see if enough force is being
applied to the charge roll by applying
a slight downward pressure with
your finger to the charge roll link arm
that the spring is attached to while
you run a print test sample. See if
the problem changes or goes away.
If this fixes or changes the problem,
then check the springs and charge
roll link arm assemblies for binds or
defective parts. Replace as
necessary.
Check the charge roll for any signs
of toner buildup or other
contamination on the outer edges
that correspond to the bands on the
page. Check the charge links and
arms for proper operation, binds or
incorrectly mounted counterbalance
springs. Repair or replace as
necessary.