Id Sensor Pattern Production Timing - Ricoh AFICIO A267 Service Manual

DRUM CHARGE 20 September 1999
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

2.5.2 ID SENSOR PATTERN PRODUCTION TIMING

The ID sensor pattern is not made every page or every job. It is only made in the
following conditions:
• During warming up at power on
• If the machine starts warming up after a certain time (default: 30 minutes) has
passed since entering night mode or low power mode
The 30-minute interval can be changed using SP2-995.
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