HP LaserJet M1120 - Multifunction Printer User Manual

Scanner functions and operation
The following sections describe how the document scanner functions.
Scanner functions
The contact image sensor (CIS) is the major component of the optical scanning system. The CIS
consists of three LEDs (red, green, and blue), a light guide, the scanning glass, the rod lens array, and
a sensor array. When the CIS scans a document, the CIS moves and the paper is stationary.
Figure 4-2 Optical system (1 of 2)
The formatter controls the CIS. To begin scanning, the formatter sends a signal to the CIS. The LEDs
illuminate and the light passes through the light guide and scanning glass and strikes the document.
Light that the document reflects passes back through the scanning glass and rod lens array into the
sensor array. The sensor array consists of 5,148 photosensors (468 photosensors on each of 11 sensor
driver circuits). The sensor array collects and amplifies the reflected light and converts it into serial data
in the driver circuits. The CIS sends the data to the formatter for image formation.
36 Chapter 4 Operational theory ENWW

HP LaserJet M1120 - Multifunction Printer Specifications

General

Print Technology	Laser
Scanner Type	Flatbed
Scan Input Colour Depth	24-bit
Functions	Print, Copy, Scan
Print Speed	19 ppm
Connectivity	USB 2.0
Media Sizes Supported	A4, A5, A6, B5, Envelopes
Time to First Page	8.5 sec
Copy Speed	19 cpm
Maximum Number of Copies	99 copies
Maximum Scan Area	21.6 x 29.7 cm
Standard Input Capacity	150 sheets
Standard Output Capacity	100 sheets
Power Consumption (typical)	370 W
Supported Operating Systems	Mac OS
Scan Resolution	Up to 1200 dpi (color and monochrome, flatbed)