Lexmark MX931 User Manual page 58

Set up, install, and configure
For two‑sided, long‑edge printing
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Load letterhead facedown with the header toward the back of the tray.
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Load prepunched paper facedown with the holes against the right side of the tray.
For two‑sided, short‑edge printing
•
Load letterhead facedown with the header toward the left side of the tray.
•
Load prepunched paper facedown with the holes against the back of the tray.
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