With the HP color laserjet 4600 printers, you always know what to expect. Designed with the modern office in mind, the HP color laserjet 4600 printers produces every page with the same speed and precision, be it a standard memo or a colorful sheet of graphics for tomorrow’s meeting. With 600 x 600 dpi resolution printed at 17 pages per minute for both color and monochrome documents, the printer delivers the consistent quality and production speed you demand. Outstanding HP technology combines premium style with cost effectiveness. Crisp text, smoothly blended color, and supremely accurate supply monitoring are the result of direct color laser printing–your images will be clearly legible and remarkably vivid, with realistic skin tones. The paper tray can handle 600 sheets of letter-size or legal-size paper, or 20 envelopes. Labels, photo paper, transfer sheets, card stock, and transparencies are processed individually. The printer is compatible with Windows and Macintosh systems, and it connects via an IEEE 1284-compliant parallel plug. Memory of 96 MB of RAM is standard, and memory is expandable to an impressive 416 MB. Hewlett-Packard provides a one-year warranty with onsite service.

HP color laserjet 4600 printers Photosensitive drum cleaning
A cleaning blade inside the print cartridge clears the remaining toner on the photosensitive drum as the drum rotates past the blade. This waste toner is moved into the waste toner container in the top of the print cartridge. Figure illustrates this step.

During the printing process, toner adheres to the primary charging roller and the toner charging roller. To prevent print quality defects, this toner needs to be cleaned. The DC controller alternately applies negative bias in different values to the primary charging roller and the toner charging roller when one of the following occurs:

  
The printer is turned on.

  
The covers are closed.

  
At the start of a print operation.

Applying bias removes the toner from each roller. The toner on the primary charging roller is transferred to the photosensitive drum, and the toner on the toner charging roller is transferred to the developing cylinder. Then the cleaning blade scrapes the toner on the photosensitive drum into the waste toner container, as described above. The toner on the developing cylinder is returned to the toner case. Figure 2 illustrates this process.