Canon TR8500 Series Online Manual page 37

After inserting the cassette into the printer, the paper information registration screen for the cassette is
displayed on the touch screen.
7. Select the size of the loaded paper in the cassette at Page size, and then select Register.
8. Open the operation panel (E), pull out the paper output tray (F) and paper output support
(G), and open the output tray extension (H).
Be sure to open the operation panel before printing. If the operation panel is close, the printer does not
start printing.
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