Development
SM 6-27 G179
Detailed
Descriptions
Toner Supply Mechanism
The toner supply motor [A] rotates the toner bottle [B] and the mylar blades [C]
Toner falls into the toner bottle holder, and the toner supply mylar blades [C] transfer the
toner to slit [D]. The toner falls into the development unit through the port [E].The left side of
the entrance seal is higher than the right. This improves the efficiency of seal on the left
side, especially when the drum is removed.
Toner Density Control
There are two modes for controlling and maintaining constant toner supply: sensor control
(both direct and indirect) and image pixel count control. The mode can be changed with
SP2-208-1 (Toner Supply Mode).
The factory setting is sensor control mode; image pixel count mode should only be
used temporarily until a defective TD or ID sensor can be replaced.
Sensor Control Mode
In the sensor control mode, the amount of toner required to print the page is calculated by
the CPU; it adds up the image data value of each pixel and converts the sum to a value
between 0 and 255. (255 would mean a completely black page.)
The machine must vary toner supply for each print in order to maintain the correct amount
of toner in the developer and to account for changes in drum reflectivity due to changes in
temperature and humidity. The CPU uses data from the TD sensor and ID sensor to
determine whether or not the toner supply motor should be switched on and to calculate
how long it should remain on in order to supply more toner to the mixture in the
development unit.
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