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Technical Explanation > Image Formation System > Controls > Transfer/Separation
Technical Explanation > Image Formation System > Controls > Transfer/Separation
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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
Control timing
Conditions
When a job starts
Executed each time at initial rotation
At paper interval
For each 100 accumulated images
Control description:
1) Monitor current value of the secondary transfer DC bias is detected.
2) Optimal target current value is determined based on temperature/humidity data of the
Environment Sensor (UN27) and paper type.
3) The secondary transfer DC bias is determined that is to be applied to the Secondary
Transfer Outer Roller.
Related Service Mode:
COPIER > DISPLAY > MISC > ENV-TR : Dspl of environment: sec trns ATVC ctrl
Secondary transfer bias control
Purpose: To transfer toner on the ITB to paper
The secondary transfer bias, which has been generated on the Secondary Transfer High
Voltage PCB (UN03), is applied to the Secondary Transfer Outer Roller.
There are 2 types of the secondary transfer bias (the DC positive and the DC negative) to
apply bias with the following purpose.
• DC positive: Toner on the ITB is transferred to a paper when printing.
• DC negative: Toner on the Secondary Transfer Outer Roller is attracted onto the ITB
when cleaning.
The secondary transfer bias value is determined by the ATVC control with the DC Controller,
which makes constant current value running though the Secondary Transfer Outer Roller.
Related Service Mode:
COPIER > ADJUST > HV-TR > TR-ENV1 to 16 : Sec trns indiv setting environment:set 1
to 16
COPIER > ADJUST > HV-TR > TR-DUP1 to 16 : Sec trn indiv set clr mod/fd side: set 1 to 16
COPIER > ADJUST > HV-TR > TR-VL1 to 16 : Sec trns indiv set ppr allot voltg:set 1 to 16
COPIER > ADJUST > HV-TR > TR-PPR1 to 16 : Sec trns indiv setting paper type: set 1
to 16
COPIER > ADJUST > HV-TR > 2TR-OFF : Uniform adj sec trn ATVC ppr allot voltg
Related Alarm Code:
30-0032 : Error in secondary transfer ATVC (below the lower limit)
T-2-25
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Primary Transfer Roller Disengagement Control
Purpose: To disengage the color Primary Transfer Roller 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.
[1]
Bk
Color
F-2-53