MX-C250 OPERATIONAL DESCRIPTIONS 11 – 21
B. Transfer operation
Toner images on the OPC drum are transferred onto the primary
transfer belt by applying a high positive voltage to the primary
transfer roller.
Then, a high transfer voltage is applied to the transfer belt drive
roller to transfer toner imaged on paper. The secondary transfer
roller is connected to GND to flow the secondary transfer current.
C. Secondary transfer roller cleaning operation
A high positive voltage is applied to the primary transfer belt drive
roller to attach unnecessary toner of the primary transfer roller onto
the transfer belt. The toner is cleaned with the transfer belt cleaning
blade and transported to the waste toner section.
D. Transfer belt mode switch operation
The transfer belt is in the three modes: the free position, the color
print mode, and the monochrome print mode.
Free position: The OPC drums are separated from the transfer belt.
Color print mode: All the OPC drums are in close contact with the
transfer belt.
Monochrome print mode: The K OPC drum is in close contact with
the transfer belt.
The mode is switched by the developing motor (K) and the mode
switch clutches (1TURC 1, 1TURC 2). When the roller separation
clutch (1TURC) is turned ON, the transfer cam is rotated to shift the
primary transfer link and the primary transfer arm in the arrow
direction in conjunction with the cam, separating the roller.
Relationship between the transfer belt mode (state) and the
transfer belt mode sensor
Constant current
power
Constant voltage
power
Constant
voltage
power
Constant
voltage
power
Constant current
power
Secondary transfer output
Separation
output
MC gri d output
Constant current
power
Constant voltage
power
Mode (State)
Sensor state
1TUD
CL
1TUD K
Color print mode: All the OPC drums are in close
contact with the transfer belt.
OFF
ON
Free position: All the OPC drums are separated
from the transfer belt.
ON
OFF
Monochrome print mode: Only the K OPC drum is
in close contact with the transfer belt.
ON
ON
Color print mode
Free position
Monochrome print mode