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HP Color LaserJet 4550

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Upgrade Rule. DIMM pin. With the secondary transfer roller biased at a positive hp laserjet 4550dn, the toner on the ITB is pulled onto the media as the ITB passes over the secondary transfer roller.

hp laserjet 4550dn C Chapter 5 Theory of operation Secondary transfer roller Figure Secondary transfer Separation As the media passes the secondary transfer roller, it passes over the charge eliminator. The charge eliminator removes any positive charge on the media that came from the secondary transfer roller.

The elimination of positive charges decreases hp laserjet 4550dn of the paper to the belt and allows for better separation. The toner is then transferred to the waste toner reservoir.

Waste toner cleaning operation Although most of the toner is transferred from the ITB, some residual toner remains. Hp laserjet 4550dn ITB cleaning roller moves into position and places a positive charge on the residual toner.

Hp laserjet 4550dn the residual toner reaches the drum, it is transferred to the drum's surface by the drum's negative charge. The residual toner is then transferred from the ITB to the drum. This waste toner is then removed from the drum's surface by a cleaning blade, collected by the sweeper strip, and placed in the waste toner reservoir by the waste toner transfer plates.


Intermediate transfer belt ITB cleaning roller Figure ITB residual toner cleaning Waste toner transfer plate Cleaning blade Sweeper strip Waste toner Waste toner reservoir Figure Waste toner to waste toner reservoir C Chapter 5 Theory of operation Fusing The final step in the image formation process is the fusing of the hp laserjet 4550dn to the media. The heat and pressure provided by the fusing assembly serve two purposes: to permanently fuse the toner to the media and to melt the toner together to produce the full-color image on the page. This process uses upper and lower rollers made of Teflon tubing to reduce sticking. Both rollers are heated by Halogen heaters, which cause the four colors to fuse and mix on the paper, creating the permanent image.

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Toner density can vary as a result of environmental conditions, a deteriorated photosensitive drum, or the amount of toner used. A pattern of toner patches with varying densities is laid on the photosensitive drum. The DC controller detects the density of these patches and determines the optimum developing bias for each color. The DC controller uses the density sensor PS14located in the drum drawer assembly, to read the density of the density detection pattern. PS14 contains a density detection circuit, a light- emitting diode LEDand photodiodes 1 and 2. To read the density, the sensor emits hp laserjet 4550dn from the LED, reflects it off the density detection pattern on the photosensitive drum, and receives it with photodiode hp laserjet 4550dn.

Photodiode 1 receives the light directly from the LED. The signals from photodiodes 1 and 2 are then compared to determine density values. Photosensitive drum cartridge The drum drawer assembly is a user-replaceable assembly that contains the photosensitive drum, primary charging roller, drum memory, and waste toner storage.

HP parts for CA Color LaserJet Printer

The drum motor M4 drives the drum drive assembly, which in turn drives both the photosensitive drum and the ITB discussed later in the mechanical system. Because the primary charging roller's function was discussed in the image formation section, only the drum memory and waste storage areas are hp laserjet 4550dn here.

Photosensitive drum life Located inside the drum cartridge is an EEPROM that stores an identification code along with drum life and waste toner information. A life threshold value is used as a comparison number to indicate when the drum has reached its end of life. During printer operation, the DC controller writes to the drum memory at specific times: when power is deactivated, when the drum drawer hp laserjet 4550dn opened, or whenever 20 pages are printed.Download the latest drivers, firmware, and software for your HP Color LaserJet Printer is HP's official website that will help automatically detect hp laserjet 4550dn.

The hp color LaserJet printer has exceptional color print quality with no performance (speed) trade-offs, backed by HP's unparalleled reputation for quality.

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