HP LaserJet Enterprise 600 Service Manual - Page 53

the scanner mirror that is rotating at constant speed. The laser beam is reflected by the scanner mirror, passes through the lenses, and scans on the photosensitive drum. Figure 1-24 Laser/scanner system Formatter DC controller SCANNER MOTOR SPEED CONTROL signal LASER CONTROL signal VIDEO signal BD INPUT signal Scanner mirror Scanner motor unit Laser driver BD PCA Photosensitive drum The laser scanner uses two laser diodes to scan two lines simultaneously, producing high-speed laser scanning. After receiving the print command from the host computer, the DC controller PCA activates the scanner motor, which rotates the six-sided scanner mirror. The laser-driver PCA emits light from the two laser diodes according to signals from the DC controller PCA. The two laser beams strike the sixsided scanning mirror and are directed through the focusing lenses and onto the photosensitive drum. ENWW Laser/scanner system 29