Canon PIXMA MX394 Online Manual page 39

(5) Open the output tray extension.
3. Open the paper output tray.
(1) Open the paper output tray gently, and extend the paper output support.
Important
Be sure to open the paper output tray when printing. If not open, the machine cannot start printing.
Note
After loading paper
Select the size and type of the loaded paper on the print settings screen of the operation panel or printer driver.
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