Fusing Temperature Control - Minolta CF910 Service Manual

1154SBM1903A

19-3. Fusing Temperature Control

• Fusing temperature is controlled by the following components.
Part Name Symbol
Upper Fusing H1
Roller Heater
Lamp
Lower Fusing H2
Roller Heater
Lamp
Upper Fusing TH1
Roller
Thermistor
Lower Fusing TH2
Roller
Thermistor
Upper Fusing TS1
Roller
Thermostat
Lower Fusing TS2
Roller
Thermostat
The surface temperature of the roller detected by the thermistor (TH1, TH2) is applied as
an analog signal to Master Board PWB-I and Upper/Lower Fusing Roller Heater Lamp H1/
2 is turned ON or OFF as necessary to control the fusing temperature.
• Warm-up is completed
When both TH1 and TH2 detect the temperature set by "Fuser Temp" of the Service mode
after H1 and H2 have been turned ON.
• Turns ON during the warming-up cycle; it turns OFF, how-
ever, while AIDC and Vi are being detected during the image
stabilization sequence and during shading correction.
• Turns ON during a copy cycle.
• Turns ON in the standby state following warming-up.
• Turns ON during the warming-up cycle.
• Turns ON during a copy cycle.
• Turns ON in the standby state following warming-up.
• Detects the surface temperature of the Upper Fusing Roller.
• 145/150/155°C temperature control (as set by "Fuser Temp"
of Service mode).
• 140/145/150°C temperature control (in Energy Saver).
• Detecting an abnormally high temperature (180°C): C0520
• Detecting an abnormally low temperature (120°C): C0510
• Detecting an abnormally low temperature (114°C) (in Energy
Saver): C0510
• Detects the surface temperature of the Lower Fusing Roller.
• 145/150/155°C temperature control (as set by "Fuser Temp"
of Service mode).
• 139/144/149°C temperature control (in Energy Saver).
• Detecting an abnormally high temperature (180°C): C0521
• Detecting an abnormally low temperature (80°C): C0511
• Detecting an abnormally high temperature (220°C): Shutting
down power supply to H1.
• Detecting an abnormally high temperature (220°C): Shutting
down power supply to H2.
M-123
Function