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Main Unit Theory of Operation Fusing Section
2-117
II Composition/Operation
C. 3rd stage: Thermostat protection
• If neither the soft protection nor hard protection can detect an abnormally high tempera-
ture due to a defective thermistor, the Heating Roller Thermostat (TS1) and Fusing Pres-
sure Roller Thermostat (TS2) operate at the specified temperature. This shuts down the
power supply to the Heating Roller Heater Lamp (H1) and Fusing Pressure Roller Heater
Lamp (H2), thus forcibly turning them OFF.
4138to2109c0
Fusing Unit
Lower Voltage
Unit (LV1)
Mechanical Control Board
(PWB-A)
Relay
Power Switch
Fusing Pressure Roller
Heater Lamp
Heating Roller Heater Lamp
Thermostat
Thermistor
Heater
REM
L
N
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