Proactive Control - Konica Minolta magicolor 5550 Service Manual

20. Fusing section
20.3.8

Proactive control

• To shorten the time period that begins when a print request is accepted and ends when a
copy is printed out, the proactive rotation of the fusing motor is controlled.
A. Control start timing
• A print request is received.
B. Control termination timing
• After the lapse of a predetermined time, at the start of a print cycle, when a malfunction
occurs or at the start of the power save mode.
C. Control operation timing
1. The fusing pressure roller and the fusing belt are rotated at the specified speeds.
2. If a print start request is accepted during the proactive control, the control proceeds
to "print control."
3. If a malfunction or media misfeed occurs or a power save request is made during
the proactive control, the control proceeds to "heater OFF control."
20.3.9 Print control
• To ensure a good fixing level and light transmission performance of the OHP transparen-
cies, the fusing speed, fusing pressure roller temperature, and fusing belt temperature
are controlled.
A. Control start timing
• A print request is received.
B. Control termination timing
• A malfunction or media misfeed occurs.
C. Control operation timing
1. The fusing pressure roller and fusing belt are turned at the specified speed.
2. The temperature adjustment is started with the target temperature of the Heating
roller heater lamp set at the appropriate level for each media to be printed.
Similarly, the temperature adjustment is started with the target temperature of the
pressure heater set at the appropriate level for each media to be printed.
3. When the leading edge of the first sheet of media moves past the registration roller,
the fusing pressure roller and fusing belt are turned at the specified speed corre-
sponding to the type of the media.
4. If there is another sheet of media to be printed when the trailing edge of the pre-
ceding sheet of media moves past the fusing pressure roller/fusing belt, the fusing
heater lamp/1 temperature, fusing heater lamp/2 temperature, and the fusing
speed are changed to the settings that correspond to that particular piece of media.
5. After the trailing edge of the last sheet of media moves past the exit roller, the con-
trol proceeds to "post-print cycle control."
• To prevent fusing failure that may happen just after the main power switch is turned ON,
the fusing temperature is set to higher than normal until the specified time elapses or the
specified number of printed pages is produced after the warm-up cycle has been com-
pleted.
• When a print cycle is started, the temperature control is reset to normal after a predeter-
mined number of printed pages is produced.
• If the stand-by condition remains, the temperature control is reset to normal after a pre-
determined time elapses.
98
Theory of operation Ver. 1.0 Nov. 2006