Toner Density Control - Ricoh FT4430 Service Manual

April '88
16
Detect mode A controls toner density as follows:
.
SP Mode # 35 changes the toner end detection level and the timing cycle.
The toner end detection level drops to 0.65 and the monitoring cycle is every
5 copy cycles.
SP Mode # 54 is used to turn on the LED of the sensor. VR201 adjusts the
light intensity of the sensor LED. Therefore, the photosensor Vsg can be
correctly calibrated.
Toner density control can be selected with SP Mode # 30.
If Vsg becomes less than 2.5 volts, the CPU determines that the sensed data
is abnormal. It then changes from detect mode to fixed supply mode. The
amount supplied is determined by the data of SP Mode # 32 (fixed mode). At
the same time the Service Call indicator starts blinking. However, copies can
still be made.
High image density (no toner is added)
Low image density (toner is added)
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