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4. Supplying Toner
a . O u t l i n e
Toner is supplied from the hopper based on the measurements taken of the toner density. Different
methods are used to measure the density between Bk toner and Y, M, and C toners because of different
toner characteristics. For Y, M, and C toners, the color toner density sensor is used to measure the den-
sity of the toner in the developer layer on the developing cylinder. As in the case of carriers, the Bk toner
tends to absorb infrared light, and for this reason the density on the developing cylinder cannot be mea-
sured. The video signals carrying a Bk component are counted to find out the image density, thereby com-
puting toner consumption. When copying operation ends, the SALT sensor measures the toner image on
the photosensitive drum to find out the toner density.
See Figures 3-533 and -534 for sequences used to measure Y, M, and C toners and the Bk toner; the
supply operation is executed each time the measurement value falls below a specific value.
Measuring the Y, M, and C Toners
Figure 3-533
DC controller PC0
SALT sensor
Figure 3-532
Measurlng the Bk Toner
Figure 3-534
3-l 07
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