Overview - HP LaserJet II Serie Manual De Instrucciones

HP 33440/HP 33449 COMBINED SERVICE MANUAL
5=2s IMAGE FORMATIONSYSTEM
Overview
bser printing requires the interaction of several different areas of technolo~ (mechanid,
electronics, optics, electrophotographics, etc.) which must be coordinated to produce a printed
page. The first in the sequence of processes, image formation, centers around the photosensitive
drum contained in the Electrophotographic (EP-S) Cartridge and consisti of four progressive
stages
Cleaning.
w Conditioning.
I Writing.
Developing.
MO additiond stages, performed outside the EP-S Cartridge, are:
Transferring.
m Fusing.
Most image formation system component which undergo wear or degradation (consumable
components) are conveniently assembled in the replaceable EP-S Cartridge. Because this makes
maintenance essentially an operator's task, it ehminates the need for a service dl when these
pa~ must be replaced. The EP-S Cartridge contains the photosensitive drum, Primary Corona,
developing station, toner cavity, and cl~ning station. A cross-section of the EP-S Cartridge
deting the image formation system and its relationship to other printer components is illustrated
in Figure 5-2.
CONDITIONING
Mir'o'
WR!T!NG
Primary Corona Wre
1
Laaer Beam
1" :
Primary tirona GrU
Eraae Lamps
\
,.,r—--l.-l
.-. /"'
\
.-— . .
CLEANING ~
Blade
k~
DEVELOPING :
J
1, ;;:;",
Developing Cylinder
,,/"t
Photo-
Fusing Roller Cleaner
Sensitive
\ 7
,, / Cartridga
Drum
b. ~ -b
FUSING
Upper Fusing Roller
'~.._
..-K+'~-upRo"er
Iu
Registration Rollers
f '\
TRANSFERRING
Static:Charge Tranafar Corona
Eliminator
Lower Fusing Roller
Feed Guide Assembly
Figure
5-2. Diagram
of
EP-S Cartridge Illustrating Image
Formation System
5-4