Canon imageRUNNER ADVANCE C3330 Series Service Manual page 82

● Primary Charging
Primary charging bias control
Purpose
To apply voltage to the Primary Charging Roller in order to charge the Photosensitive Drum Surface to a negative potential
Charging method
Roller charging (DC charging (no AC charging))
The primary charging bias (DC negative), which has been generated by the Secondary Transfer High Voltage PCB (UN03),
is applied to the Primary Charging Roller.
The primary charging bias value is determined by the DC Controller PCB (UN04) based on the following conditions:
• Environment (humidity detected by the Environment Sensor (UN27))
• Life of the Photosensitive Drum
No.
[1] Photosensitive Drum
[2] Primary Charging Roller
UN04 DC Controller PCB
UN03 Secondary Transfer High-voltage PCB
[1]
[2]
Parts name
70
2. Technology