Canon Laser Class 700 Series Reference Manual page 170

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Lower the document output tray and document feeder tray.
G
Disposing of Used Toner Cartridges
To protect the environment, Canon has started a special program to help you
dispose of your empty toner cartridges. After you install a toner cartridge, keep
the original packaging material and the shipping label. After a cartridge has
been used up, fill out this label and call UPS for pickup. UPS will pick up the
empty toner cartridge, at Canon's expense, and return it to a recycling center.
For details about this program, contact your local authorized Canon dealer.
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6-8 Changing the Toner Cartridge
CF-PL Reference Guide_USEN HT1-2187-000-V.1.0