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Fusing Section Main Unit Theory of Operation
2-106
II Composition/Operation
16.3.5 Warm-up control
• Control is provided until the Heating Roller reaches the predetermined level.
• The Power Save mode is not accepted during a warm-up cycle.
A. Control start timing
• The Power Switch is turned ON.
• A malfunction or media misfeed is reset.
• The machine leaves the Power Save mode.
• A door is closed.
B. Control termination timing
• A malfunction or media misfeed is reset.
• A door is opened.
C. Control start decision
• If the information provided by the Temperature/Humidity Sensor (HS1) is less than a pre-
determined value, the low temperature start control is provided.
• If the information provided by the Temperature/Humidity Sensor (HS1) is the predeter-
mined value or more, the ordinary start control is provided.
D. Low temperature start control
1. The “single reference temperature adjustment” is started with the target temperature of
the Heating Roller Heater Lamp set at 80°C + correction value. At the same time, the
“single reference temperature adjustment” is started with the target temperature of the
Fusing Pressure Roller Heater Lamp set at 10°C.
2. The control proceeds to “ordinary start control” after the lapse of a predetermined
period of time after the Heating Roller temperature has reached the target value.
3. The control proceeds to “heater OFF control” if an event of control termination timing
occurs during control.
Warm-up cycle control diagram during low temperature start
OFF
ON
HI
LOW
HI
LOW
Fusing Motor (M4)
Fusing Ready
Temperature control
Temperature control
Temperature control Temperature control
Fusing
Pressure Roller
Heating Roller
Temperature (°C)
170 + ǩ
80 + ǩ
150
165
10
Heating Roller Heater Lamp
(H1) Remote
Fusing Pressure Roller
Heater Lamp (H2) Remote
Warm-up start
Fusing Unit rollers
and belt start
4138to2144e0
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