Overheat Protection
The BICU references the fusing temperature through the thermistor [A]. The copier prevents overheating as
listed below. Normally, Feature 1 is effective in preventing overheating. Features 2 through 3 are fail-safe
features.
Feature 1:
The BICU turns off the fusing lamp when the fusing temperature is too high.
Feature 2:
The BICU disables the machine operation when the thermistor detects an abnormal temperature transition.
In a case like this, the copier displays one of these codes: SC543, SC544, SC545, or SC546.
If the fusing temperature is too low, SC542 is displayed.
Feature 3:
The BICU disables the machine operation when the thermistor does not normally work. In a case like this,
the copier displays SC541.
Feature 4:
The thermoswitch near the center [B] cuts power to the fusing lamp at 160°C; the thermoswitch near the
end [C] cuts power to the fusing lamp at 170°C. These thermoswitches and the fusing lamp are on the
same circuit.
• Thermoswitch temperature is somewhat lower than the fusing temperature.
6. Detailed Section Descriptions
288
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