2DA/2DB
2-1-11
(1) Formation of magnetic brush
The developing roller consists of a magnet roller with four poles and a sleeve roller. Rotation of the sleeve roller around
the magnet roller entrains toner, which in turn forms a magnetic brush at pole N1 on the magnet roller. The height of the
magnetic brush is regulated by the doctor blade; the developing result is affected by the position of the poles on the
magnet roller and the position of the doctor blade.
A developing bias voltage generated by the high-voltage PCB (HVTPCB) is applied to the developing roller to provide
image contrast.
Figure 2-1-11 Forming a magnetic brush
Figure 2-1-12 Developing section block diagram
A
Doctor blade
Developing roller
A: Distance between the doctor blade and developing roller; 0.3 ± 0.05 mm
N1:870 × 10
-4
T
N2:400 × 10
-4
T
S1:725 × 10
-4
T
S2:910 × 10
-4
T
N1
94
86
100
S2
S1
N2
Drum
EPCB
YC22-5
YC8-10
YC3-14
DPCB
HVTPCB
YC4-2
TCDSW
DBDB
TCS
OFS
YC1-8
TCS
TCDSW
OFS
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