Transfer - Kyocera KM-1820 Service Manual

(5) 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.
The nominal transfer bias is set to approximately -1.8 kV (limit) with the -6 mA current. Since the ideal potential of the
transfer bias depends on the thickness of paper, the bias is raised to approximately -2.5 kV/-6 mA for thicker paper. On
the other hand, the bias current is reduced to -1.8 kV/-6 mA for thin paper.
Transfer bias
High voltage PWB
YC1-A6
YC1-A5
YC-T
YC1-A7
YC1-A8
Figure 2-1-15 Transfer
Drum
Transfer roller
Bias
PWB
RTHVDR
YC8-15
THVDR
YC8-13
HVISEL
YC7-2
PSEL1
YC7-6
Engine PWB
2-1-15
2GM