21-4.Lower Fusing Roller Pressure/Retraction Mechanism - Minolta CF1501 Service Manual

21-4. Lower Fusing Roller Pressure/Retraction Mechanism
• To extend the service life of the Fusing Belt, the Lower Fusing Roller is retracted from the
Fusing Belt at any time except during a copy cycle or when there is a paper misfeed.
• A motor dedicated to the purpose is used to press the Lower Fusing Roller up against,
and retract it from, the Fusing Belt.
• The Lower Fusing Roller at the pressed position is detected by the Fusing Pressure
Position Sensor.
• The Fusing Pressure Position Sensor is also used to count a given number of pulses, as
started counting from the pressed position to stop the Lower Fusing Roller at the
retracted position.
• Pressure/Retraction Timing
Power Switch ON
Warm-up
In standby
Copy cycle
When heaters are forced
OFF
Conditions
Not in retracted position
Start
End
–
Start
End
–
M-89
Pressure/Retraction Operation
Pressed → retracted
Retracted → pressed
Pressed → retracted
Retracted
Retracted → pressed
Pressed → retracted
Retracted