Toner Bottle Supply and Ventilation
The toner supply motor [A] (a dc motor) and gears [B] rotate the toner bottle [C].
The toner cooling fan [D] (below the operation panel) ventilates the area around the bottle. This fan always
switches off and on with the polygonal mirror motor.
Toner Supply Control
There are two toner supply modes: Sensor Control and Image Pixel Count. The mode can be changed with
SP2208-001 (Toner Supply Mode). The factory setting is sensor control mode. This setting automatically
changes if the TD sensor or ID sensor is defective.
Sensor Control Mode
In sensor control mode, the machine uses the outputs of the TD sensor and the ID sensor.
Every copy, the following occurs.
1. The TD sensor reads the density of the toner in the developer once every copy cycle, after the trailing
edge of the image passes the development roller, and outputs this reading as Vt. The current Vt value
can be displayed with SP2223-001 (Vt display).
6. Details
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