Id Sensor Pattern Production Timing; Drum Charge Roller Cleaning - Ricoh K-C3 Service Manual

B245/B276/B277/B268/B269 Service Manual
voltage is compared with Vsg (read from the bare drum at the same time).
If the humidity drops, the drum potential goes up (to a higher negative voltage) even if the
charge roller voltage supply stays the same (efficiency of voltage transfer is higher with
lower humidity). As a result, less toner is transferred to ID sensor pattern [B]. If the sensor
output reaches a certain point, the drum charge voltage will be reduced.
To determine whether to change the drum charge roller voltage, the machine compares
Vsdp with Vsg.
Vsdp/Vsg > 0.95 = Make the drum charge voltage less negative (smaller) by 50 V
Vsdp/Vsg < 0.90 = Make the drum charge voltage more negative (larger) by 50 V

ID Sensor Pattern Production Timing

The ID sensor pattern is made at the following times. (Not made every page or every job.)
During warm-up at power on
When the machine starts warming up from energy saver mode and the temperature is
less than the target temperature as set with SP Mode.
When the machine starts warming up from energy saver mode and the machine prints
more than 100 prints after generating the p-pattern.

Drum Charge Roller Cleaning

Because the drum charge roller [A] always contacts the drum, it gets dirty easily. So, the
cleaning brush [B] also contacts the drum charge roller all the time to clean the surface of
the drum charge roller.
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