Canon imageRUNNER ADVANCE C2030 Service Manual page 87

2
Process/Operation > Image Formation System > Controls > Transfer/Separation
● Secondary Transfer Bias Control
Toner on the ITB is transferred to a paper.
The secondary transfer bias (TR2), which has been generated on the secondary transfer bias
generation circuit, is applied to the Secondary Transfer Outer Roller.
There are 2 types of the secondary transfer bias (the DC positive and the DC negative) to
apply bias with the following purpose.
• DC positive: Toner on the ITB is transferred to a paper when printing.
• DC negative: Toner on the Secondary Transfer Outer Roller is attracted onto the ITB when
cleaning.
The secondary transfer bias value is determined by the ATVC control with the DC Controller,
which makes constant current value running though the Secondary Transfer Outer Roller.
Apply Constant
Voltage (Positive)
2 Process/Operation > Image Formation System > Controls > Transfer/Separation
Secondary Transfer Outer Roller
Apply Constant
Voltage (Negative)
Detect
Current
F-2-74
● ITB Displacement Correction Control
The ITB displacement correction control corrects displacement of the ITB to prevent tear of
the ITB (caused by displacement of the ITB).
There is a rib inside the ITB at the front edge and the 2 Aligning wheels are located across the
rib. When the ITB is displaced toward the front or the rear during rotation of the ITB, the rib
contacts the Aligning wheels at the front or the rear, which makes the Aligning wheels rotate.
The rotation of the Aligning wheels is transmitted to the Aligning Arm through the Aligning
Gear and the Aligning Arm moves the Steering Roller up and down. The up/down movement
of the Steering Roller makes the ITB slide to the front or the rear to correct displacement.
ITB
Direction that the
ITB is displaced
Aligning
to after correction.
Gear
Rib
Aligning
Wheels
Direction that the ITB is
Aligning Arm
displaced to before correction.
2-53
ITB Steering Roller
ITB
F-2-75
2-53