HP Color LaserJet Enterprise CP4525 Printer series - Manual (Page 103)

Paper orientation for loading Tray 2 or optional Trays 3, 4, and 5
Paper type Image orientation Duplex mode How to load paper
Preprinted or letterhead Portrait 1-sided printing Face up
Top edge at the left side of the tray
Automatic 2-sided printing Face down
Top edge at the left side of the tray
Landscape 1-sided printing Face up
Top edge toward the back of the product
Automatic 2-sided printing Face down
Top edge toward the back of the product
Prepunched Portrait or landscape 1- or 2-sided printing Holes toward the back of the product
ENWW Paper orientation for loading trays 89