Konica Minolta bizhub c650 Service Manual page 179

19. Fusing section
19.3.8 Sensor disconnection detection control
• If the temperature of the NC sensor/thermistor fails to reach the specified temperature in
the given period after the warm-up started, the sensor is judged to have disconnection,
and the trouble code will appear.
Roller name
NC sensor: TEMS
2
Heating roller Heating roller thermistor/2: TH2
Heating roller thermistor/3: TH3
Fusing pres-
Fusing pressure roller thermistor: TH4 C3923
sure roller
Soaking
Soaking roller thermistor/1: TH5
roller
19.3.9 Heating roller rotate detection
• If the heating roller doesn't rotate even after the IH heater is conducted, an appropriate
temperature measurement and temperature control cannot be made. If the IH heater is
ON without rotating of the heating roller for a long time, the heat concentrate on the cer-
tain area and the roller may get damaged due to the heat.
• If the heating roller doesn't rotate even after the IH heater ON, the trouble message for
heater roller rotating failure appear. (C3102)
• As two heating roller rotation sensors are used, the rotation can be detected even if
either sensor get broken, which improves the safety.
Heating roller rotation sensor/1 (PS56)
Heating roller rotation
sensor/2 (PS57)
19.3.10 Detection of a new fusing unit
• When a new fusing unit is installed in the machine, the life counter is automatically
cleared through the machine's capability of detecting a new fusing unit.
• The new unit is detected when the sub power switch is turned ON.
144
2
Sensor name: code
Cam gear
Theory of Operation Ver. 8.0 Jun. 2008
Trouble code
Fusing high temperature
C3925
abnormality_NC sensor
Fusing high temperature
C3921
abnormality_heating center
Fusing high temperature
C3922
abnormality_heating edge
Fusing high temperature
abnormality_pressure
Fusing high temperature
C3924
abnormality_Soaking
Heating roller rotation detection gear
Heating roller
A00JT2C267AA