Process Control and MUSIC
D0CA/D0C9/D0C8/D0CB 7-66 SM
Trigger Operative Condition Notes
SP3-533-001/011
Non-use (Idle) Non-use time becomes more than the value in
SP3-531-001.
-
Manual
Process
Control
When SP3-011-001 is executed. -
Toner End
Recovery
When a Toner End is resolved. -
Initial Setting When an initial developer setting is completed. -
Vc is the charge bias, which is applied to the charge rollers.
Vd is the potential of the unexposed (charged) drum.
The value of Vc is not equal to Vd.
For example, if applying a Vc of 700 [-V], the actual drum potential (Vd) tends to be about 650
[-V].
Vb is the potential when toner starts to stick to the drum (Development bias).
When the potential gets to Vb or greater, toner starts to stick to the drum in proportion to the
potential. Development gamma is the coefficient showing the relation between the potential and
the volume of toner adhesion.
In addition to the development gamma and the potential, the toner density in the developer
needs to be controlled. This is done to maintain the proper toner density (the amount of toner
adhesion).
The target for the toner density in the developer is when the output from the TD sensor (S14) is
Vtref.
Process Control is done as shown in the following chart, which includes development gamma
determination, Vtref correction, and LD power control.
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