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Technology > Image Formation System > Controls > Auxiliary Control
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White Band Control
Oppositely-charged toner on the Developing Sleeve is forcibly applied on the Drum and
collected by the Cleaning Unit.
MEMO:
Large-grained toner is less likely to be charged compared to small-grained toner
and can be positively charged (opposite charging) in rare cases. Such oppositely-
charged toner fails to be developed but remains on the Developing Sleeve, which
causes image failure.
Execution timing
Last rotation after every job
Control description
Developing bias Vdc is increased once the image trailing edge passes through the developing
position.
Vback is increased and the oppositely-charged toner on the Developing Cylinder is moved
onto the Drum.
Related error codes
Related service modes
COPIER>FUNCTION>MISC-P>WB : Reverse toner forcible eject: blank band
COPIER>ADJUST>MISC>TBSIS-WB : Setting of blank band ejection time
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Technology > Image Formation System > Controls > Auxiliary Control
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Black Band Control
This control maintains the cleaning performance by providing sufficient amount of toner to the
edge of the Cleaning Blade.
MEMO:
Friction coefficient between the Blade and the Drum is increased unless sufficient
amount of toner is applied on the Drum Cleaning Blade, which causes ride-up of
the Blade. Although toner is properly applied to the center of the Blade by normal
cleaning operation, toner is supplied insufficiently to the edge of the Blade.
<Execution timing>
Last rotation after the specified number of sheets*1 has been fed since execution of the
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last black band control.
•
When low duty discharge control is executed.
*1: This value can be changed in service mode.
Moisture content
12g or more
2-86
Interval (sheets)
2,000
T-2-44
2-86
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