HP LaserJet Pro CM1415fnw Color Multifunction Printer - Manual (Page 135)

Copy on both sides manually (duplex)
1. Load the first page of the document onto the
scanner glass or into the document feeder.
2. From the Home screen, touch the Copy button.
3. Touch the Black or Color button to start
copying.
4. Remove the printed copy from the output bin,
and maintaining the same orientation, load the
page with the printed side down into Tray 1.
ENWW Copy on both sides manually (duplex) 119