HP Color LaserJet Enterprise M651 Printer series - Manual (Page 23)

Table 2-1 Tray 1 paper orientation
Paper type Image orientation Duplex mode How to load paper
Preprinted or letterhead Portrait 1-sided printing Face-down
Bottom edge leading into the product
Automatic 2-sided printing Face-up
Bottom edge leading into the product
Landscape 1-sided printing Face-down
Top edge toward the back of the product
Automatic 2-sided printing Face-up
Top edge toward the back of the product
ENWW Load Tray 1 15