Service manual
EFL4i6(MlActionbaar
16W
Sarvlca
h4hnua/
Opwating
Rincfpha
2.1.1.3 Laser Exposure
Laser exposure is the process of creating an invisible static electric image on the PC drum with
laser beams emitted from the
optid
unit.
The
mirror
motor
(scann
er motor) rotates the
six+ided
mirror counterclockwise to produce a laser light scan. (One side of the
mirror produces one scan.)
The SOS (start of scan)
sensor detects the laser rays
fmm
the fOS
mirror and outputs the SOS
signals to make the starting position of each line of the image uniform.
Laser
ernissiorl
Print Head Unit
PcDrurrl
Approx.
-50V
Invisible
atatic-
eiactricity
image
2.1.1.4 Development
Development is the process
Sos
ID
L
Potygon
Motor
Figure 2-6. Laser Exposure
of creating a toner image on the PC drum
bv
amdvirvz
toner to the
invisible static electric image.
l’he
do&or
blade
spre~ds
a thin, even mat
if
m“~e~
ov&
the flexible
sleeve. When the toner
~asses
between the d&tor blade &d the flexible sleeve, it becon&
negatively charged. The flexible sleeve transports toner to the surface of the PC drum and controls
the development with the developing bias voltage.
No positively charged toner is transported to the PC drum, and the doctor blade is negatively
charged to prevent the printout from having a foggy background.
r
Resin
Sleeve
0
Toner
()
~-m
--
-.
---
1
=
I@prox.
pclv
I
,.
II + II
v
t
PC Drum
Sleeve Roller
Figure 2-7. Development
2.1.1.5
Drum Cleaning
After the image is transferred onto paper, any re
~g
toner on the PC drum is scraped off by
the cleaning blade and collected in the used toner
bottie.
Rev.
A
24