Canon LBP-2000 User Manual page 64

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3-26 Printing Envelopes from the Multi-Purpose Tray
Place the envelopes on a clean, flat surface and press down
the corners to flatten the envelopes.
Flex the stack on all four sides to remove any stiffness. Check
all corners. If the corners are curled, straighten them.
IMPORTANT
Be sure to flatten out the leading edges of the envelopes if they are curled
downwards. Otherwise a paper jam may occur.
Correct any dog-eared corners, then align the edges of the
stack of envelopes by tapping them on a flat surface.