2Nd Transfer Voltage Control; 2Nd Transfer Voltage Setting Control (Atvc: Auto Transfer Voltage Control - Konica Minolta BIZHUB C3100P Service Manual

• The 2nd transfer roller is pressed against the transfer belt to allow the roller to be cleaned.
(2) 2nd transfer roller retraction
• The 2nd transfer roller is retracted from the transfer belt at timing when a detection pattern is produced on the transfer belt during, for
example, an image stabilization control sequence.
• The 2nd transfer roller is also retracted from the transfer belt when the image on the transfer belt cannot be transferred onto paper due to
a paper empty condition during a print cycle.
• The 2nd transfer roller is retracted from the transfer belt after the 2nd transfer of the last image is completed during a multi-print cycle.
(3) Pressure/release operation
1. When the registration clutch and the 2nd transfer pressure solenoid are energized, the rotation is transmitted to the release cam via a
coupling gear.
2. When the release cam is rotated a half turn, the release slider moves to the front side of the main body, which results in the 2nd transfer
roller being pressed against the transfer belt.
3. When the registration clutch and the 2nd transfer pressure solenoid are energized a second time, the release cam is rotated another half
turn. This moves the release slider toward the back side of the main body, which results in the 2nd transfer roller being retracted from the
transfer belt.
[3]
[A]
[1] 2nd transfer pressure solenoid (SD2)
[3] Release slider
[5] Registration clutch(CL3)
[A] Release

7.3.2 2nd transfer voltage control

• The transfer voltage is applied to the 2nd transfer roller in order to transfer the toner image from the transfer belt to the paper.
• The transfer voltage is applied after the 2nd transfer roller has been pressed against the transfer belt.

7.3.3 2nd transfer voltage setting control (ATVC: auto transfer voltage control)

• The transfer voltage is corrected to reduce effect from the transfer belt and environmental changes of toner.
(1) Operation timing
• A print request is accepted.
• During a multi-print cycle, the temperature inside the main body changes by a predetermined value or more from the level during
execution of ATVC, and a predetermined number of printed pages or more have been produced since the execution of the previous
ATVC.
(2) Control
1. The 2nd transfer roller is pressed against the transfer belt.
2. A constant current is applied to the 2nd transfer roller.
3. The voltage of the 2nd transfer roller surface is detected.
4. Using a conversion formula, the output value of the transfer voltage is determined.
[1]
[4]
[5]
[B]
[6]
[3]
O-21
O THEORY OF OPERATION bizhub C3100P > 7. 2ND TRANSFER
[2]
[2] Transport motor (M2)
[4] Release cam
[6] 2nd transfer roller
[B] Pressure
SECTION