Canon LBP6230dw Manual page 176

A Portion of the Page Is Not Printed/Printing Position is Wrong
Did you print data without margins, all the way to the edge of the page?
This symptom occurs if a margin is set to none in the printer driver. The range that can be printed on this machine
is the range inside a 5 mm argin around the edge of the paper or a 10 mm margin around the edge of envelopes.
Make sure to have margins around the document to print.
[Finishing] tab
White Streaks Appear/Printing is Uneven
Is toner running low?
Remove the toner cartridge, shake it 5 or 6 times to evenly distribute the toner inside the cartridge, and then
reload it into the machine.
Using Up All of the Toner
Is it time to replace the toner cartridge?
Materials inside the toner cartridge may have deteriorated. Replace the toner cartridge.
How to Replace Toner Cartridges
Is printing uneven for some types of paper or some printing environments?
In the printer driver, change the setting of [Special Print Adjustment B]. The remedial effect is weakest for [Mode 1]
and strongest for [Mode 3]. Try the adjustment starting with [Mode 1].
[Finishing] tab
When you select a stronger improvement effect, printing speed becomes slower.
White Spots Appear
Are you using paper that has absorbed moisture?
Replace with appropriate paper.
Paper
Are you using appropriate paper?
Check the usable paper types, and replace with appropriate paper.
Paper
Is it time to replace the toner cartridge?
Materials inside the toner cartridge may have deteriorated. Replace the toner cartridge.
How to Replace Toner Cartridges
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[Advanced Settings] [Expand Print Region and Print]
[Advanced Settings] [Special Print Adjustment B]
[Off]
Select mode