Outline of the TD sensor
In this model, a non-contact toner density (TD) sensor, which we also call a mu ( ) sensor, is used for
toner density control.
The TD sensor is attached on the lower side of the development unit. Unlike a HST sensor, the board of
the TD sensor is exposed. So there is a cover around the sensor to protect it and to maintain a good
contact between the sensor and development unit.
The TD sensor measures the permeability of the developer without contacting it, from the outside of the
case, and converts the measured value to the toner density.
According to the toner density measured by this sensor, the proper amount of toner is supplied to the
developer.
A counter corresponding to the frequency is used as the unit of TD sensor output. Thus, unlike a HST
sensor which directly detects Vt, the TD sensor output is converted into Vt for toner supply control.
In the TD sensor, there is an ID chip storing the machine identification information, the running distance
information of Development unit and PCU, and other information used by image density control.
Process Control
Outline
Process control adjusts the condition of the imaging hardware to maintain a constant image density.
Process control is executed at the following times.
Process Control
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