Curl Correction Mechanism; Cpm Down Determination Using A Temperature Sensor; Cpm Down Determination Using Paper Passage Time - Ricoh MP C2504 Field Service Manual

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7. Detailed Descriptions

• The down level % is a value for the case where a typical paper (Normal paper: A4 or smaller

paper sizes) passes through the SEF at normal speed. There may be some differences

depending on paper size/paper thickness.

CPM down level

The temperature sensor is checked at given intervals, and if the detection temperature is above a

threshold value, the CPM is decreased by 1 level.

Since the points at which temperature tends to increase depend on the paper size, the sensor used

is changed depending on the paper size.

Paper width (length)

Depending on the paper size, it may not be possible to determine the points on the fusing sleeve

belt which tend to rise in temperature by a sensor.

Therefore, time conditions are also used to determine CPM down, and if continuous paper passage

time is above a threshold value, CPM is decreased by 1 level.

(When CPM down is performed by time conditions, CPM does not increase thereafter.)

Curl Correction Mechanism

This machine provides a curl reduction mechanism on the fusing exit.

Check sensor

Pressure roller thermistor (edge)

Thermopile (edge)

Pressure roller thermistor (center)

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