Ricoh SP 8400DN Field Service Manual page 1405

Ricoh a3 size black and white laser printer.

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and outside of the paper width it may get extremely hot. In order to prevent the belt from breaking due to this

excessive temperature rise, CPM down is implemented depending on the usage conditions. CPM down can

be implemented in the following 3 levels depending on the detected temperature at the temperature sensor, or

the paper passage time.

The down level % is a value for the case where a typical paper (Normal paper: A3/DLT/LT/A4)

passes through the SEF. There may be some differences depending on paper size/paper thickness.

CPM down level

CPM down determination using a temperature sensor

The temperature sensor is checked at given intervals, and if the detected 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.

A3/DLT/B4 (SEF)

B5/A5/B6/A6 (SEF)

CPM down determination using paper passage time

Depending on the paper size, it may not be possible to use a sensor to determine the points on the fusing belt

which tend to rise in temperature.

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.)

Fusing thermistor (pressure roller end)

Fusing thermopile (end)

Fusing thermistor (pressure roller center)

7.Detailed Descriptions

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