6.11 PROCESS CONTROL
6.11.1 OVERVIEW
In this machine, there are two processes.
• Potential control. Adjusts the image creation process (charge, development
bias, and LD power) to achieve the target toner coverage. During potential
control several series of patterns are created at prescribed times. The potential
sensor and ID sensor read these patterns. The readings of these sensors are
used to determine the development capacity (development gamma), and then
adjust the conditions around the drum to reproduce the best possible images.
Potential control also puts the machine in the best possible condition to begin
toner supply control.
• Toner supply control. Detects the amount of toner applied to ID sensor patterns
between pages and adjusts the amount of toner supplied to the development unit
to maintain consistency in the amount of toner.
NOTE: MUSIC (Mirror Unit Skew Interval Correction) done to correct the horizontal
and vertical skewing of the print images on the ITB is not part of process
control.
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