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18 Safety ENWW
Protection by the hardware circuit
The output voltages from TH1 and TH2 (fuser temperature sensors) are compared with the
abnormality judgment reference value in the comparator circuit. If the output voltage from TH1
or TH2 exceeds the reference value, L2 (fuser heater lamp 1), L3 (fuser heater lamp 2), L4
(fuser heater lamp 3) and RL1 (main relay) are turned off.
CAUTION Periodically check the TH2 face contacting the roller, and replace TH2 if any
abnormality is detected.
Since TH1 (fuser temperature sensor) face does not contact the roller, check
the distance from the roller and the sensor orientation if any abnormality is
detected.
The RL1 function must not be deactivated under any circumstances.
Protection by TS1 (thermostat/U) and TS2 (thermostat/L)
When the temperature of the fuser roller (upper/lower) exceeds the specified value, TSs are
turned off, thus interrupting the power to L2 (fuser heater lamp/1), L3 (fuser heater lamp/2), and
L4 (fuser heater lamp/3) directly.
CAUTION Do not use any other electrical conductor in place of TS1 and TS2. Do not
change the distance between the roller and TS (thermostat).