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Process Control
Process Control
Mechanism
Sensor Construction
The ID Sensors (also called the TM/ID sensors) are used to measure the amount of toner on the transfer
belt and to correct any errors in color registration.
The TD sensor (also called the
sensor) is used to measure the toner density in the developer.
Outline of the ID Sensors
The ID sensors are fixed onto the main frame, against the surface of the transfer belt. Color registration is
checked by all three sensors; the front [A], center [B], and rear [C].
The center sensor [B] acts as an ID sensor and a MUSIC sensor.
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.
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Troubleshooting
