Id Sensor Pattern Production Timing - Ricoh B022 Service Manual

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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 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 SP2995-1.

• At the end of a job, if an ID sensor pattern has not been made for a certain

number of sheets (default: 0 sheets = disabled)

The number of sheets can be changed using SP2995-2.