Oki OL1200 Service Manual page 28

AC voltage heats the heater. The control board supervises the heat roller temperature via the thermistor,
and regulates the heater roller at a predetermined temperature (185 - 188°C) by connecting or
disconnecting the AC voltage supply to the heater. If the heater roller temperature rises abnormally, the
thermostat of the heater voltage supply circuit is activated to cut the AC voltage supply forcibly.
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