11.4.4 Overheat Protection
There is an overheat protection circuit in the main board. If the hot roller
temperature reaches 245°C during the main motor off condition, or 255°C
during the main motor on condition, the resistance of the thermistor (between
CN113-1 and CN113-2) becomes too low. If the main board detects this
condition, "E-53" lights on the operation panel and power to the fusing lamp
is cut.
Even if the thermistor overheat protection fails, the thermofuse opens when it
reaches 169°C, removing power from the fusing lamp.
IMAGE FUSING 20 December 1996
2-56
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