Ricoh M0A0 Service Manual page 348

7.Detailed Descriptions
The fusing temperature, except for that of the Energy Saver mode, can be adjusted in the SP mode.
Overheat Protection
If the thermistor overheat protection fails, there is a thermostat [1] that also monitors the hot roller temperature.
The thermostat [1] monitors the external temperature of the hot roller.
If the temperature of the thermostat becomes greater than 185 °C, the thermostat opens, removing power from the
fusing lamp. At this time, the machine stops.
The thermistor (center) [2] monitors the surface temperature of the hot roller.
If the temperature becomes greater than 250 °C, the CPU cuts off the power to the fusing lamp.
The thermistor (edge) [3] also monitors the surface temperature of the hot roller.
If the temperature becomes greater than 250 °C, the CPU cuts off the power to the fusing lamp. At this time, SC543 will
be generated.
The customer engineer can use the SP mode (5-810-001) to make the machine recover from the SC543 status.
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Status
Envelopes
Post Cards
Recycled Paper
Temperature (Celsius)
200
195
178