Kyocera Mita FS-6020 Service Manual page 104

FS-6020
Engine/high
voltage PWB
YC8-2
(B)OUT
Formation of the magnetic toner brush
The developing roller consists of the developing magnet (roller) equipped with three magnetic poles and the developing
sleeve. The magnetic toner brush is formed on the magnetic pole N1 of the developing sleeve. The height of this
magnetic toner brush is restricted by the developing blade, and the development depends on the pole position of the
developing magnet (roller) and the position of the developing blade.
In addition, the developing bias is loaded onto the developing magnet, which is output from the engine/high voltage PWB
providing the enhanced contrast of images.
Developing sleeve
2-1-6
TNEMP
Developing bias output
Developing bias output wave form
(DC and AC)
350 V±5 V DC
Figure 2-1-8 Development section block diagram
0.3 to 0.4 mm
Developing magnet
N1 N1 N1
23±0.5°
Drum
Figure 2-1-9 Formation of the magnetic brush
Toner container TK-400
Developing roller
1.5 kV±50 V AC
(2.4 kHz, duty: 50%)
Developing blade
239±3°
S 2 S 2
S 1 S 1
100±3°
Toner sensor
Magnetic force
N1: 870±50 × 10
-4
T
S1: 710±50 × 10
-4
T
S2: 750±50 × 10
-4
T