Primary Charging - Canon imageRUNNER ADVANCE 6075 Series Service Manual

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Technology > Image Formation System > Controls > Primary Charging

■ Primary Charging

● Primary Charging Bias Control
To make the surface of the Photosensitive Drum evenly and positively charged.
The primary charging bias (DC positive), which has been generated by the Primary Charging
High Voltage PCB (PCB11), is applied to the Primary Charging Wire and the Grid Plate.
• Primary charging DC bias: the bias to be applied to the Primary Charging Wire
• Grid DC bias: the bias to be applied to the Grid Plate
The primary charging bias value is specified by the potential control.
The grid bias is specified based on the estimated life and the environment.
Primary Charging High Voltage PCB(PCB11)
DC positive
2 Technology > Image Formation System > Controls > Primary Charging
DC positive
Primary Charging Wire
Grid Wire
Photosensitive Drum
F-2-73
● Primary Charging Wire Cleaning Control
To prevent charging failure caused by soil of the Primary Charging Wire.
<Execution timing>
• Interruption at every 2000 sheets of continuous print (the value can be changed in service
mode: 100 to 2000 sheets)
• After last rotation which is performed on the 1500th sheet and later since the last cleaning
(1-roundtrip)
• In the case of executing "Clean Wire" in user mode (1-roundtrip)
• In the case of executing the wire cleaning in service mode (1-roundtrip or 3-roundtrip)
<Control description>
The drive of the Primary Charging Wire Cleaning Motor (M6) makes the Cleaner Screw rotate
clockwise/counterclockwise, which moves the Cleaning Pad back and forth to clean the
Primary Charging Wire.
Position detection of the Cleaning Pad is not performed.
Primary Charging Wire Cleaning Motor
Primary Charging Wire Cleaning Pad
<Related service modes>
To clean the Charging Wire (3-roundtrip)
COPIER > FUNCTION > CLEANING > WIRE-CLN
To check operation of the Charging Wire Cleaning (1-roundtrip)
COPIER > FUNCTION > CLEANING > WIRE-EX
To specify cleaning interval of the Last Rotation Charging Wire ((Default: every 2000 sheets
(the interval can be changed within the range between 1000 and 5000 sheets))COPIER >
OPTION > CLEANING > W-CLN-P
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Screw
Primary Charging Wire
F-2-74
2-54