Canon LBP6030w Manual page 170

When pulling out the sealing tape
If any sealing tape remains inside the toner cartridge, print quality may deteriorate.
Do not pull the sealing tape at an angle. If the sealing tape breaks, you may not be able to pull it out completely.
If the sealing tape becomes stuck when pulling it out, keep pulling until it is completely removed.
6
Replace the toner cartridge.
Align with the toner cartridge guide (
7
Close the top cover.
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), and push firmly all the way in.