HP LaserJet 9040/9050 Service Manual - Page 99
and focus on the photosensitive drum.
View all HP LaserJet 9040/9050 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 99 highlights
Laser/scanner system The laser/scanner unit of the HP LaserJet 9000 series printer and the HP LaserJet 9040/9050 series printer contains two laser diodes in its laser unit. The printer employs the "twin-beam method," which scans two lines simultaneously. Based on signals it receives from the DC controller and the formatter, the laser/scanner PCA causes the two laser diodes to emit laser beams. The beams strike a six-sided mirror that rotates at a constant speed. The beams reflect off the mirror, pass through a focusing lens and a reflective mirror, and focus on the photosensitive drum. The scanning mirror rotating at a constant speed allows the laser beams to scan across the drum at a constant speed. Finally, a latent image is formed on the drum surface by constant-speed rotation of the photosensitive drum and constant-speed scanning of the laser beams. Figure 28. Laser/scanner system Laser/scanner system 83