Whatdunnit? Diagnosing Image Defects in the HP LaserJet 5000
Short summary:
... there are slight differences among models. Thus, this article applies to the HP LaserJet 5000 series ... toner cartridge. All offices have at least one person who claims to know exactly how to fix ...
Long summary:
C
olonel Mustard in the dining room with a candlestick .
Mrs. Peacock in the conservatory with a knife .
Okay, so image defects arent the most dramatic of mysteries.
Yet, given the numerous components of a laser printer
and the many factors that contribute to image defects, technicians
must play the role of detective when a printer fails to
consistently produce clean, flawless output.
Were responsible for identifying the source of black
lines, dropouts, faded or light print, loose or smeared toner,
and other nuances. Although laser printers share a common
infrastructure, there are slight differences among models.
Thus, this article applies to the HP LaserJet 5000 series
only.
Tracing the source of an image defect requires some detective
work. Lets begin with how images transfer to a page. See
Figure 1. This process involves six stages, four of which take
place inside the toner cartridge. See Figure 2.
1) Cleaning. See Figure 3.
2) Conditioning. See Figure 4.
2 |
April 2003| www.rechargermagazine.com
T
by Christopher E. Sinibaldi |Depot America
Technical
Whatdunnit? Diagnosing Image Defects
in the HP LaserJet 5000
Figure 1
Figure 2
Figure 3
Figure 4
Reprinted with persmission from Rechager Magazine
3) Writing. See Figure 5.
4) Developing. See Figure 6.
5) Transferring. See Figure 7.
6) Fusing. See Figure 8.
The process begins when the formatter board sends a signal
to the DC controller, which drives the main motor. The main
motor rotates the toner cartridge, which contains the primary
changing roller, photosensitive drum, developing cylinder and
transfer-changing roller.
Next, the primary changing roller places a negative charge
on the surface of the photosensitive drum. This charge sparks
the scanners laser to form a latent image on the photosensitive
drum. The toner, ...
Source: www.depot-america.com
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