Transfer/Separation Section - Kyocera FS-6020 Service Manual

FS-6020

2-1-4 Transfer/separation section

Transfer/separation section consists of the transfer roller and separation charger brush. The transfer bias is loaded to the
transfer roller by the high voltage output from the engine/high voltage PWB and the toner on the drum is attracted to the
transfer roller side due to the electric potential difference and then transferred to the paper. The separation bias is loaded
to the separation charger brush output from the engine/high voltage PWB acting to separate the paper with toner
transferred from the drum.
Separation bias
(R)OUT
5 µA
Control signal
SHVDR L
(Logic)
SHVSEL L
Engine/high voltage PWB
SHVDR
SHVSEL
THVDR
CPU
(U1)
TSEL1
TSEL2
RHVDR
(T)OUT
10 µA 15 µA 20 µA 25 µA
Control signal
THVDR L
TSEL1 L
(Logic)
TSEL2 L
RHVDR H
2-1-12
2
Figure 2-1-17 Transfer/separation section
output
10 µA
L
H
Separation bias output
(R)OUT
High
voltage
circuit
Transfer bias output
(T)OUT
Transfer bias output
0
L L L H
L H H -
H L H -
H H H H
Figure 2-1-18 Transfer/separation section block diagram
1
Separation
charger
brush
Transfer
reverse
voltage
500 V
H
-
-
L
1 Transfer roller
2 Separation charger
Drum
Transfer roller
brush