Transfer - Kyocera FS-1920 Service Manual

2FP/2FY/2FR

(4) Transfer

The image developed by toner on the drum is transferred onto the paper because of the electrical attraction between the
toner itself and the transfer roller. The transfer roller is negatively-biased so that the positively-charged toner is attracted
onto the paper while it is pinched by the drum and the transfer roller.
Transfer roller
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.
2-1-16
Drum
Transfer bias
Paper type
output
Thick Thin
-2.6 kV -2.1 kV
Figure 2-1-16 Transfer
S
N
S
High
voltage
unit
TR CN2-13
Engine
board
TRCHON*
YC5-6