HP LaserJet 6L User Manual download pdf (Page 64)

Toner Cartridge

As the “heart” of the Image Formation System, the toner cartridge houses the

cleaning, conditioning, and developing steps of the process. The toner cartridge

contains the photosensitive drum, primary charging roller, developing station, toner

cavity, and cleaning station. Including these components, which wear, degrade, or

are consumed in the replaceable toner cartridge, eliminates the need for a service

call when replacement is required. The special photosensitive properties of the drum

allow an image to be formed on the drum surface and then transferred to paper.

CAUTION The printer’s toner cartridge does not include a light-blocking shutter. Be careful to

avoid exposing the drum to light, which can permanently damage the drum. Protect

the cartridge whenever removing it from the printer.

Step 1: Drum Cleaning

The cleaning blade is in contact with the surface of the drum at all times. As the

drum rotates during printing, excess toner wiped off and stored in the waste toner

receptacle.

Step 2: Drum Conditioning

After the drum is physically cleaned, it must be conditioned. This process consists

of applying a uniform negative charge on the surface of the drum with the primary

charging roller, located in the toner cartridge. The primary charging roller is coated

with conductive rubber. An AC bias is applied to the roller to erase any residual

charges from any previous image. In addition, a negative DC bias is applied by the

charging roller to create a uniform negative potential on the drum surface. The

amount of DC voltage is modified by the print density setting.

Step 3: Image Writing

During the writing process, a modulated laser diode projects the beam onto a

rotating scanning mirror. As the mirror rotates, the beam reflects off the mirror, first

through a set of focusing lenses, off a mirror, and finally through a slot in the top 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.

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. At the end 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, where it is converted to an

electrical signal used to synchronize the output of the next scan line of data.

Functional

Overview

Functional Overview 5 - 13

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HP LaserJet 6L User Manual Page 64