HP 5100LE manual Writing the image

Writing the image

During the writing process, a modulated laser diode projects the beam onto the rotating six-sided scanning mirror. As the mirror rotates, the beam reflects off the mirror, through a set of focusing lenses, through a slot in the rear of the toner cartridge, and onto the photosensitive drum. The beam sweeps the drum from left to right, discharging the negative potential wherever the beam strikes the surface. This creates a latent electrostatic image, which later is developed into a visible image.

Figure 19.	Writing the image
	Because the beam is sweeping the entire length of the drum and the drum is rotating, the entire
	surface area of the drum can be covered. The speed of the scanner motor (which turns the
	scanning mirror) and the speed of the main motor (which turns the drum) are synchronized, and
	each successive sweep of the beam is offset by 1/1200th up to of an inch. The beam can be
	turned on and off to place a dot of light every 1/1200th of an inch. This is how the printer
	achieves its 1200x1200 dpi resolution. After the writing process, the drum surface has an
	invisible (latent) electrostatic image.
	At the beginning of each sweep, the beam strikes the beam detect lens, generating the Beam
	Detect Signal (/BD). The BD signal is sent to the dc controller board, where it is converted to an
	electrical signal used to synchronize the output of data (/VDO) for one sweep (scan line) and to
	diagnose problems with the laser diode or scanner motor.

86 Functional information Q1860-90918

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