Dell B1265dnf User Manual page 64

Storing the toner cartridge
3
Estimated cartridge life
Estimated cartridge life the life of the toner cartridge (or imaging unit) yield
depends on the amount of toner that print jobs require. The actual print yield
may vary depending on the print density of the pages you print on, operating
environment, percentage of image area, printing interval, media type and/or
media size. For example, if you print a lot of graphics, the consumption of the
toner is higher and you may need to change the cartridge more often.
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3. Maintenance