Canon i-SENSYS MF729Cx Important Safety Instructions And Installation Manual page 631

Toner Smudges and Splatters Appear
Are you using appropriate paper?
Check usable paper, and replace with appropriate paper.
Paper
Loading Paper
Is the toner cartridges consumed?
Check how much the amount remaining in toner cartridges is left, and replace the toner cartridges as necessary.
Replacing Toner Cartridges
Does the paper size specified in the driver match actual paper used?
To have the machine display an error before data is printed on a different paper size, set <Prioritize Driver Settings
When Printing> to <Off>.
Prioritize Driver Settings When Printing
Printouts Are Faded
Is the toner cartridges consumed?
Check how much the amount remaining in toner cartridges is left, and replace the toner cartridges as necessary.
Replacing Toner Cartridges
Are you using appropriate paper?
Check usable paper, and replace with appropriate paper. Also, specify the paper size and type settings properly.
Paper
Loading Paper
Specifying Paper Size and Type
Are the printouts faded when you print on envelopes?
Selecting <Envelope 2> for <Envelope Switch> may solve the problem.
Special Processing
A Portion of the Page Is Not Printed
Do you print data without margins?