HP Pro 4300 C9H70UT C9H70UT#ABA manual Laser/scanner assembly

Laser/scanner assembly

The laser/scanner produces the latent electrostatic image on the photosensitive drum in the print cartridge.The main components of the laser/scanner assembly are the laser driver PCA, the scanner motor, various mirrors, and the focusing lenses.

Scanner motor PCA

Scanner motor

Scanner mirror

BD PCA

Focusing lens

BD mirror

MirrorPhotosensitive drum

(inside the print cartridge)

Laser beams

Figure 12. Laser/scanner assembly

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 six-sided scanning mirror and are directed through the focusing lenses and down onto the photosensitive drum. The modulated laser beams generate the latent electrostatic image on the photosensitive drum according to the image data signals received from the DC controller PCA.

76 Theory of operation Q2431-90912