Datasheet

5 Product guide | HP Officejet Pro X451/X551 color printer series
Revolutionary HP PageWide Technology—how does it work?
HP PageWide Technology is the secret behind the exceptional speed and reliability of this amazing printer. The
star player is a printhead that spans the entire width of the paper, enabling single-pass printing at blazing fast
speeds. This is the same HP PageWide Technology found in top-end digital presses.
The printhead contains a massive number of tiny ink ejectors—over 40,000 of them positioned to span across
the width of the page. As the paper passes under the printhead, ejectors release a minute drop of black or color
ink at precisely the right location to form the printed image. Unlike laser-based printers, where a laser beam
must “write” a single dot at a time, or a conventional inkjet printer, which moves the print mechanism back and
forth, the printhead, with its array of ink ejectors, remains stationary—only the paper is moving while ink is
applied across the page.
The printer also performs continuous self-diagnosis, using special sensors to analyze the miniscule ink drops as
they leave the printhead. It then calibrates the system accordingly. This calibration process is done in real time,
resulting in optimized print quality at any given moment. All of these complex processes occur at a breathtaking
pace, resulting in blazingly fast desktop printer speeds.
For a more detailed description of PageWide Technology, see the technical white paper at www.hp.com/united-
states/campaigns/officejet-pro-x/?jumpid=ex_r11400_go_officejetprox.
Each die has 4,114 ink
ejectors (1,200 per inch),
42,240 ink ejectors total.
PageWide printhead
Printhead contains an
array of ten 4-color dies.
Print zone
Output bin
PageWide printhead
All-pigment inks in four colors
Servicing station
Servicing station
MP tray 1
paper path
Internal duplex
paper path
Optional tray 3
paper path
Main paper tray 2 paper path