IMAGE FUSING AND PAPER EXIT
B121 Series/B259 Series 6-66 SM
6.13.6 OVERHEAT PROTECTION
This machine protects its hardware from overheat by three features. Normally, the
first feature can fully protect the hardware. The second feature works as the fail-
safe feature for the first one. The third feature works as the fail-safe feature for the
second one.
FIRST FEATURE: If the fusing temperature reaches 230°C (or higher) and stays so
for one second, the controller turns the fusing lamp off. In a case like this,
SC543 or SC553 is displayed.
SECOND FEATURE: If the fusing feature reaches 250°C, the controller cuts off the
24V line. (The fusing lamps are on the 24V line.)
THIRD FEATURE: Two thermostats are attached on each line of the two fusing lamps.
(four thermostats in total). One of the two thermostats cuts the power supply to
the fusing lamp at 179°C, and the other cuts the power supply at 180°C. (Note
that the thermostat temperature is somewhat lower than the fusing
temperature.)
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