Transfer - Kyocera FS-1900 Service Manual

(4) Transfer

The image developed by toner on the drum A is transferred onto the paper because of the electrical
attraction between the toner itself and the transfer roller B. The transfer roller B is negatively-
biased so that the positively-charged toner is attracted onto the paper while it is pinched by the
drum A and the transfer roller B.
Transfer
bias
Normal
output
Voltage
−2.3 kV
The nominal transfer bias is set to approximately -2.3 kV (limit). Since the ideal potential of the
transfer bias depends on the thickness of paper, the bias is raised to approximately -2.6 kV for
thicker paper. On the other hand, the bias current is reduced to -2.1 kV for thin paper.
FS-1900
A
B
Paper type
Thick Thin
−2.6 kV −2.1 kV
Figure 4-1-12 Transfer
S
N
S
High
voltage
Transfer bias
unit
output
TR CN2-13
4-14
Engine
board
TRCHON*
YC204-6