Canon LBP-5100 User Manual page 403

Vertical streaks appear.
Cause
Remedy
Printed pages have white specks.
Cause 1
Remedy
Cause 2
Remedy
Cause 3
Remedy
7
Residual images appear on non-printed areas.
Cause 1
Remedy
Cause 2
Remedy
Cause 3
Remedy
7-26 Print Quality Problems
Printing was performed using the static charge eliminator.
Select the [Reduce Vertical Streaks on Outputs] check box in [Assisting Print
Settings] in [Device Settings] in the [Options] menu in the Printer Status
Window. Then, cycle the power of the printer to make the setting effective.
When the [Reduce Vertical Streaks on Outputs] check box is selected, however,
print quality other than vertical streaks may deteriorate.
Appropriate paper is not being used.
Replace the paper with one that can be used and print again. (See "Paper
Requirements," on p. 3-2)
Paper is damp since the paper has been stored in unsuitable condition.
Replace the paper with new one and print again. (See "Paper Requirements,"
on p. 3-2)
The drum in any of the toner cartridges has deteriorated.
Replace the toner cartridge with a new one. (See "Replacing Toner Cartridges,"
on p. 6-2)
Printing paper is inappropriate.
Change the paper and print again. (See "Paper Requirements," on p. 3-2)
Paper of a wider width was printed just after paper with a narrower width (A5
size etc.) was printed continuously.
To lower the temperature of the fixing unit, wait for a while before printing again.
The drum in any of the toner cartridges has deteriorated.
Replace the toner cartridge with a new one. (See "Replacing Toner Cartridges,"
on p. 6-2)