IMAGE FUSING AND PAPER EXIT 20 February, 2001
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6.13.6 OVERHEAT PROTECTION
If the hot roller temperature becomes greater than 230°C for more than 1 second,
the CPU cuts off the power to the fusing lamp. At this time, the LCD will display
SC543.
Even if the thermistor overheat protection fails, there is a thermostat in series with
the common ground line of the fusing lamp. If the temperature of the thermostat
reaches 180°C, the thermostat opens, cutting the power to the fusing lamp, and
printing stops. At the same time, SC544 or 546 is generated. After resetting the
SC, when turning on the main switch, SC541 will appear.
There is also a thermofuse to ensure overheat protection. If the temperature of the
thermofuse reaches 172°C, the thermofuse opens, cutting the power to the fusing
lamp. The thermofuse is farther from the hot roller than the thermostat, so it opens
later than the thermostat.
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