Dell 1600n Multifunction Mono Laser Printer - Manual (Page 154)

A single sheet of paper may be defective. Try reprinting the job.
The moisture content of the paper is uneven or the paper has
moist spots on its surface. Try a different brand of paper. See
"Paper Specifications" on page 200 .
The paper lot is bad. The manufacturing process can cause some
areas to reject toner. Try a different kind or brand of paper.
The toner cartridge may be defective.
Vertical repetitive defects
on the next page.
If these steps do not correct the problems, contact a service
representative.
Vertical lines If black vertical streaks appear on the page, the drum inside the toner
cartridge has probably been scratched. Install a new toner cartridge.
See
"Installing the Toner Cartridge" on page 23 .
Gray background If the amount of background shading becomes unacceptable:
Change to lighter weight pages. See "Paper Specifications" on
page 200 .
Check the printer's environment; very dry (low humidity) or high
humidity (higher than 80% RH) conditions can increase the
amount of background shading.
Remove the old toner cartridge and install a new one. See
"Installing the Toner Cartridge" on page 23 .
Toner smear Clean the inside of the multi-function printer. See page 153 .
Check the paper type and quality. See "Paper Specifications" on
page 200 .
Remove the toner cartridge and install a new one. See "Installing
the Toner Cartridge" on page 23 .
Vertical repetitive
defects If marks repeatedly appear on the printed side of the page at even
intervals:
The toner cartridge may be damaged. If a repetitive mark occurs
on the page, print a cleaning sheet several times to clean the
cartridge; see
"Cleaning the Drum" on page 159 . After the
printout, if you still have the same problems, install a new toner
cartridge. See
"Installing the Toner Cartridge" on page 23 .
Parts of the multi-function printer may have toner on them. If the
defects occur on the back of the page, the problem will likely
correct itself after a few more pages.
The fusing assembly may be damaged. Contact a service
representative.
Background scatter Background scatter results from bits of toner distributed on the printed