Lexmark C910 User Reference Manual page 51

Loading letterhead
a
For both simplex (single-sided) and duplex printing on letterhead, place the printed side
face up.
b
Continue with
6
Gently slide the print media into the multipurpose feeder.
Note: Forcing the print media may cause it to buckle.
7
Slide the width guides until they lightly rest against the edges of the print media. Do not bend
the print media.
8
Push the SET button to the left to unlock the bottom plate.
step 6.
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