Primary Transfer Control; Primary Transfer Bias Control - Canon imageRUNNER ADVANCE C3325 Series Service Manual

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Technical Explanation > Image Formation System > Controls > Transfer/Separation
● Primary Transfer Control
Primary Transfer ATVC
Purpose: To set the transfer voltage required to obtain the target transfer current value in
order to prevent transfer failure due to environmental changes
Control description:
1) Current value of the primary transfer DC bias is detected.
2) Optimal target current value is determined based on temperature/humidity data of the
Environment Sensor (UN27).
3) The primary transfer DC bias to be applied to the Primary Transfer Roller is determined.
Control timing Adjustment timing
Automatic adjustment When a job starts
by the output of a
specific number of prints
At paper interval
Control at job completion For each 500 accumulated images (only in high
At startup At power-on
At recovery from sleep
mode
Automatic adjustment When switching to a color
by switching modes job from a B&W job
Automatic adjustment Drum Unit replacement
by replacement
Replace the Developing
Unit.
At initial installation At power-on
Related Service Mode:
COPIER > FUNCTION > MISC-P > 1ATVC-EX : Exe of primary transfer ATVC control
Related Alarm Code:
30-0025 : A voltage value below the threshold value was detected with primary transfer
ATVC control for yellow
30-0026 : A voltage value below the threshold value was detected with primary transfer
ATVC control for magenta
30-0027 : A voltage value below the threshold value was detected with primary transfer
ATVC control for cyan
30-0028 : A voltage value below the threshold value was detected with primary transfer
ATVC control for black
2 Technical Explanation > Image Formation System > Controls > Transfer/Separation
Conditions
For each 100 accumulated images
When sudden environmental changes are
detected by the Environment Sensor
For each 100 accumulated images
temperature and high humidity environment)
For each 1000 accumulated images
At normal startup
If 8 hours or more have elapsed in high-speed
startup mode
If 8 hours or more have elapsed in sleep mode
100 or more accumulated images of color jobs
When sudden environmental changes are
detected by the Environment Sensor from when
the previous ATVC was executed
When a new Drum Unit is inserted
When INISET-Y/M/C/K/4C is executed in
service mode
At initial installation
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Primary transfer bias control

Purpose: To apply current to the Primary Transfer Roller
The primary transfer bias is divided into each color (Y/M/C/Bk), and is generated by the
Primary Transfer High Voltage PCB (UN02) and applied to the Primary Transfer Roller.
The primary transfer bias value is determined by the primary transfer ATVC control.
ON and OFF of the primary transfer bias can be switched by color, and it is possible to turn
OFF the bias of the color which will not be used.
NOTE:
The ATVC control secures transfer performance that is not affected by change in
resistance caused by the environment as well as deterioration of the Primary Transfer
Roller and is executed respectively to the primary transfer bias of each color.
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