Formation Of Magnetic Brush - Kyocera KM-1650 Service Manual

(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 mag-
net 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.
Developing roller
A: Distance between the doctor blade and developing roller; 0.3 ± 0.05 mm
Drum
Doctor blade
A
Figure 2-1-11 Forming a magnetic brush
DB
Figure 2-1-12 Developing section block diagram
HVTPCB
OFS
OFS
TCDSW
TCDSW
TCS
TCS
S2
94
N1
100
S1
-4
N1:870 x 10
-4
N2:400 x 10
-4
S1:725 x 10
-4
S2:910 x 10
EPCB
DB
YC3-14
YC22-5
YC8-10
YC1-8
YC4-2
DPCB
2DA/2DB
86
N2
T
T
T
T
2-1-11