Toshiba 350 All in One Printer User Manual


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e-STUDIO350/352/353/450/452/453
FUSER UNIT / PAPER EXIT SECTION
13
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(6) Temperaturedetectionconguration
Thermistor is a device whose resistance decreases as it detects a higher temperature. Thus its
input voltage to CPU changes and then CPU judges whether this change is normal or abnormal.
If one of the fuser roller thermistors is broken, the control circuit judges that the fuser roller tem-
perature is extremely low and keeps turning the IH coil ON. As a result, the fuser roller tempera-
ture rises, and possibly activates the thermostat which is a safety protection device. To prevent
this in advance, CPU works to detect whether each thermistor is broken or not.
Also, the thermistors constantly check the temperature of IH coil to prevent it from excessive
heating by IH circuit abnormality, LGC circuit abnormality or thermistor abnormality. The therm-
istorsautomaticallyturnOFFthepowerwhenthetemperatureofIHcoilexceedsthespecied
temperature.
139
137
PC4/AN4
PC6/AN6
CPU
+5
Edge
thermistor
Main
thermistor
+5
Fig. 13-406
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