Kyocera KM-4230 Service Manual page 51

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Figure 1-3-26 Developing section block diagram

Toner density is detected by the toner sensor (TNS).

The sensor section of the toner sensor detects the ratio of toner to carrier in the

developer near it and converts it into a voltage. As more toner is used, the ratio of toner

to carrier decreases, increasing the toner sensor output voltage.

When the ratio drops below the specified value, the increase in toner sensor output

voltage triggers toner replenishing. When toner is added and the ratio of toner to carrier

returns to normal, the toner sensor output voltage drops to the point where toner

replenishing stops.

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