Canon imageRUNNER ADVANCE C3330 Series, Service Manual

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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.
● Secondary Transfer Control
Secondary 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 and paper type
Execution timing
At the start of a job: Executed at each initial rotation
At paper interval: Every 100 accumulated images
Control description
1. The monitor current value of the secondary transfer DC bias is detected.
2. The optimal target current value is determined based on the temperature/humidity data of the Environment Sensor
(UN27) and the paper type.
3. The secondary transfer DC bias to be applied to the Secondary Transfer Outer Roller is determined.
Secondary Transfer Bias Control
Purpose
DC positive: Toner on the ITB is transferred to the paper when printing.
DC negative: Toner on the Secondary Transfer Outer Roller is attracted onto the ITB when cleaning.
Control description
The secondary transfer bias, which has been generated on the Secondary Transfer High Voltage PCB (UN03), is applied to
the Secondary Transfer Outer Roller.
The secondary transfer bias value is determined by the DC Controller through ATVC control, which maintains a constant
current value running though the Secondary Transfer Outer Roller.
Related service mode
• Display of the environment during secondary transfer ATVC control:
COPIER > DISPLAY > MISC > ENV-TR
• Environment in secondary transfer individual settings (setting 1 to 16):
COPIER > ADJUST > HV-TR > TR-ENV1 to 16
• Color mode/feed side in secondary transfer individual settings (setting 1 to 16):
COPIER > ADJUST > HV-TR > TR-DUP1 to 16:
• Adjustment of paper allotted voltage in secondary transfer individual settings (setting 1 to 16):
COPIER > ADJUST > HV-TR > TR-VL1 to 16
• Paper type in secondary transfer individual settings (setting 1 to 16):
COPIER > ADJUST > HV-TR > TR-PPR1 to 16
• Collective adjustment of the secondary transfer ATVC paper allotted voltage:
COPIER > ADJUST > HV-TR > 2TR-OFF
Related alarm code
• 30-0032: Error in secondary transfer ATVC (below the lower limit)
● Primary Transfer Roller Disengagement Control
Purpose
The color Primary Transfer Rollers are disengaged in the single color Bk mode in order to increase the life of image formation
parts (Photosensitive Drum, ITB).
The cam mechanism provides 3 phases, which correspond to the 3 states of Bk mode, CL mode, and full disengagement
mode.
2. Technology
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