Canon LBP7210Cdn Manual page 393

NOTE
When displaying the Printer Status Window from the printer driver
Click [ ] (Display Printer Status Window) in locations such as in the [Page Setup] sheet.
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Click [OK].
The message <Cleaning> appears in the Printer Status Window, and the printer starts
cleaning the transfer belt.
The cleaning is finished after the preceding message disappears.
Cleaning the transfer belt cannot be canceled. Please wait until it is completed.
NOTE
Cleaning time for the transfer belt
It takes approximately 50 seconds.
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