Canon LBP 2460 Service Manual - Page 72
Iii. Laser/scanner System, A. Outline,
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CHAPTER 2 III. LASER/SCANNER SYSTEM A. Outline External device Video controller PCB /BD VDO /VSYNC DC controller LLCONT /LON VDO /LENBL PD /SCND /SCNRDY /BDI BD mirror Mirror Laser driver Cylindrical lens Scanner motor Scanning mirror Focusing lens BD PCB Photosensitive drum Figure 2-3-1 When the DC controller receives a print signal (/PRNT) from the video controller, the DC controller automatically stabilizes the intensity of the laser beam (automatic laser power control: See page 2-27). The DC controller then receives the VIDEO signal (VDO) from the video controller and sends it to the laser driver in the laser/scanner unit. The laser driver turns the laser diode on and off according to the VDO signal and generates the modulated laser beam only when the VIDEO DATA ENABLE signal (/LENBL) from the DC controller is "L". The modulated laser beam is aligned by a collimator lens and a cylindrical lens into a parallel beam that strikes the scanning mirror that is rotating at a constant speed. The beam reflected from the mirror is brought to a point of focus on the photosensitive drum by the focusing lens located after the scanning mirror. As the scanning mirror rotates at a constant speed, the beam is scanned across the drum at a constant speed. The drum also rotates at a constant speed allowing the laser beam to form an image on the drum's surface. 2 - 26
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