126 Chapter 6 Troubleshooting C4170-90959
Toner Cartridge has
been exposed to too
much light.
Store the Toner Cartridge in a darkened environment
for several days. This may restore the photosensitive
potential.
Foreign objects in
beam path. Any
foreign objects will
block the light from
developing an image
on the Photosensitive
drum.
Remove the Toner Cartridge and check for damage.
Replace the Toner Cartridge if it is damaged.
Remove the Printer Cover and inspect the path from
the Laser Scanner to the Toner Cartridge drum,
looking for foreign objects in the beam path.
Dirty or obstructed
fuser entrance guide.
Clean the Fuser entrance guide.
Scared or obstructed
Fuser film unit
surface.
Replace the Fuser film unit.
Scarring on the
photosensitive drum
or defective
developing cylinder.
Replace the Toner Cartridge.
Dirty mirror in Laser
Scanner.
Replace the Laser Scanner.
Light Print
Possible Cause Action
Wrong toner density
setting.
Adjust the toner density setting in the print driver.
Make sure EconoMode is off.
Toner Cartridge
requires cleaning.
See “Toner Cartridge Cleaning” (page 63).
Paper does not meet
printer specifications
or is stored
improperly.
1) Print a few more pages to see if the problem
corrects itself.
2) Turn over the stack of paper in the tray. Also try
rotating the paper 180 degrees.
3) Check the paper (or other print media) type and
quality. Replace the paper, and advise the customer
to use the recommended paper and store it properly.
See “Media Troubleshooting” (page 134).
Poor contact between
the Engine Controller
Assembly and the
transfer roller shaft
contact.
1) Clean the contacts if they are dirty. If the problem
remains after cleaning, or if parts are damaged or
deformed, replace them.
2) Replace the Engine Controller Assembly and the
Intermediate PCB if necessary.
Defective Laser
Scanner or Transfer
Roller.
Perform the “Half Self-Test Functional Check”
(page 132). If the test passes, replace the transfer
roller. If the test fails, replace the Laser Scanner.
Toner Cartridge is low. Replace the Toner Cartridge.
See also “Faded Print/Bubbles” (page 123).
Horizontal White Lines (continued)
Possible Cause Action
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