1 October, 1999
DRUM CHARGE
2-9
Detailed
Descriptions
If the humidity drops, the drum potential goes up (to a higher –ve 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 = Reduce the magnitude of the drum charge voltage by 50 V
•
Vsdp / Vsg < 0.90 = Increase the magnitude of the drum charge voltage by 50 V
2.3.2 ID SENSOR PATTERN PRODUCTION TIMING
An ID sensor pattern is made in the following conditions.
•
During warming up at power on
•
If the machine starts warming up after entering the energy saver mode
