Development - Kyocera KM-1500 Service Manual

2DC

(4) Development

The latent image constituted on the drum is developed into a visible image. The developing roller A contains a 3-pole
(S-N-S) magnet core B and an aluminum cylinder rotating around the magnet core B. Toner attracts to the developing
roller A since it is powdery ink made of black resin bound to iron particles. Doctor blade C, magnetized by magnet D,
is positioned approximately 0.3 mm above the developing roller A to constitute a smooth layer of toner in accordance
with the roller revolution.
The developing roller A is applied with the AC-weighted, positive DC power source. Toner E on the developing roller A
is given a positive charge. The positively charged toner E is then attracted to the areas of the drum F which was
exposed to the laser light. (The gap between the drum F and the developing roller A is approximately 0.3 mm.) The
non-exposed areas of the drum F repel the positively charged toner as these areas maintain the positive charge.
The developing roller A is also AC-biased to ensure contrast in yielding by compensating the toner's attraction and
repelling action during development.
2-1-14
C
Magnetism
N
0.1 mm
S
E
S
N
S
B
A
F
Figure 2-1-14 Development
0.3 - 0.4 mm
D
Developing
bias output
275±5 V DC
+ AC
Bias
Engine board
board
YC-B
HVCLK
YC302-10 YC7-7