In order to suppress excessive temperature rise in the MFP and maintain equipment quality, a temperature detection sensor (imaging temperature sensor (thermistor)) [A] is installed in the MFP. The imaging temperature sensor (thermistor) detects the temperature environment in the MFP, and controls cooling operation (x1,
x1).
Overview of cooling operation in the machine
The temperature in the machine is detected during output and after output, and the interior of the machine is cooled by fan operation (stepwise operation of fan, prolonged fan rotation after paper has passed through) according to the temperature inside the machine.
However, if the temperature inside the machine rises significantly due to passing a large volume of paper, in addition to fan operation, the CPM is specified to control the temperature in the machine.
The Conditions of Fans Operation
The following table illustrates how/when the fans operate under the specific conditions of the main machine.
Condition | Development Exhaust Heat Fan | Paper Exit Fan | Fusing Fan | Development Bearing Cooling Fan*2 | PSU Cooling Fan*2 |
|---|---|---|---|---|---|
Warm-up | Stops | Stops | Stops | Stops | Stops |
Standby | Rotates in low speed | Stops | Rotates in low speed | Stops | Stops |
During printing | Rotates | Rotates | Rotates | Rotates | Rotates |
After printing | Rotates in low speed *1 | Stops*1 | Rotates in low speed*1 | Stops*1 | Stops*1 |
Abnormal (Jams) | Stops | Stops | Stops | Stops | Stops |
*1 When the temperature in the machine reaches 45.5 degrees, these fans keep revolving until the temperature decreases by two degrees.
*2 MP 4055 SP/5055 SP/6055 SP only
Print Duty Control
- The machine repeats a 16-page-print and 25-second-pause. The following two messages will alternatively appear on the operation panel.
“The printing speed is now being limited, because the internal cooling fan is active.”
“Internal cooling fan is active.” - All the fan motors in the machine works after printing and standby. The message will appear on the operation panel.
“Internal cooling fan is active.” - If the temperature of the image processing unit reaches under the pre-set temperature, the machine turns to the normal control.