Canon LBP251dw User Manual page 381

It takes a long time before printing starts.
● Did you print to narrow width paper? After you print to narrow width paper, the machine may cool itself to
maintain the print quality. As a result, it may take some time before the next job is printed. Wait until the
machine is ready to print. Printing will resume when the temperature inside the machine has fallen.
A blank sheet is output (nothing is printed).
● Did you pull the sealing tape out when loading the toner cartridge? If you did not pull it out, remove the
toner cartridge, pull the sealing tape out, and reload the toner cartridge.
How to Replace Toner Cartridges(P. 400)
Troubleshooting
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