Special Control; Black Band Sequence - Canon iR C2880 Series Service Manual

a. Timing for start-up
- when the power is ON
- during warm-up rotation
- in the case of continuous passage of paper, when the accumulated value is 200 prints from the last time ATVC execution.
- comparing from the last time ATVC execution, the initial rotation when the inside humidity is 10% or more, or when the change of humidity is 2 deg C or more.
- comparing from the last time ATVC execution, the next initial rotation of post accumulating 100 prints.
- immediately before D-half
- warm-up rotation in the case of sleep return of 8 hours or more.
- When new drum unit is installed.
b. Particulars of Control
Sequence
Applying the primary transfer bias
1
Monitoring the machine inside environment sensor
2
Determining the primary transfer bias
3
2. Secondary Transfer ATVC
The machine executes secondary transfer ATVC when determining the secondary transfer bias so that the target transfer current may be obtained for transfer.
a. Start-Up Conditions
- at power-on
- when the drum unit is replaced with a new one
- during initial rotation
- during post-rotation executed every 1000 prints
- during recovery from sleep
- during execution of calibration
b. Particulars of Control
Sequence
Applying the secondary transfer bias
1
Monitoring the machine outside environment sensor
2
Determining the secondary transfer bias
3

7.4 Special Control

7.4.1 Black band sequence

iR C3380i / iR C3380 / iR C2880i / iR C2880 / iR C3580 / iR C3580i / iR C3080 / iR C3080i
If continuous print is carried out while there is no toner being sent on to the ITB cleaning blade, the blade may bend backwards. This sequence feeds non-transferred
toner to the cleaning blade in order to prevent this problem.
1. Timing
- When belt rotation is performed after 1,000 sheets printing.
2. Sequence details
According to the above-mentioned timing, the solid black belt of 10mm in length is formed with the width on ITB. Once the black band clears the secondary transfer
roller, secondary transfer outer roller cleaning (see Note) is performed.
Further, once the black band is formed, the cumulative counter resets to the default (0).
T-7-12
Item
A specific bias is applied to the primary transfer roller, and HVT2 is used to detect the
level of current for feedback to the DC controller.
The DC controller monitors the output of the machine inside environment sensor.
The DC controller determines the best primary transfer bias for individual colors based
on the foregoing 3 sets of data.
T-7-13
Item
A specific bias is applied to the secondary transfer roller, and HVT2 is used to detect
the level of current for feedback to the DC controller.
The DC controller computes the secondary transfer bias correction value with
reference to the output of the compensatory environment sensor (i.e., the degree of
moisture in paper) and print job information (i.e., paper type, 1st/2nd side).
The DC controller determines the best secondary transfer bias with reference to the
secondary transfer current feedback and the secondary transfer bias correction value.
Description
Description
Chapter 7
0014-5561
7-27