Development - Kyocera FS-1030D Service Manual

(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.
(E)
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.
(C)
(D)
Magnetism
N
0.1 mm
S
S
N
S
(B)
(A)
(F)
Figure 2-1-13 Development
0.3 - 0.4 mm
Developing
bias output
275±5 V DC
+ AC
Bias
Engine PWB
PWB
YC-B
HVCLK
YC302-10 YC7-7
2G6
2-1-13