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bizhub C4000i/C3300i
Setting item
Label
Letterhead
(g) Energy save mode
• The machine enters the energy save mode from any standby state to thereby reduce power consumption (TEC value).
• TEC value (typical electricity consumption): Energy saving criteria for copiers and printers to comply with the Energy Start program.
Power consumption (kWh) at the office assuming operation of a product for one week (5 working days + 2 holidays) is calculated from
the print speed and power consumption of the product.
• The energy save mode may be either the low power mode or sleep mode, whichever is enabled depending on the set conditions.
Temperature control during sleep mode
• To reduce power consumption during the sleep mode, power to the fusing heater lamp is shut down to stop heating the fusing belt.
• If the fusing belt temperature is decreased to room temperature, the printable temperature can be recovered within the same period of
time as that of warm-up.
(4) Protection from abnormal temperatures
(a) First approach: software protection
• If the heating roller temperature sensor detects a predetermined temperature or more continuously, the temperature is determined to
be abnormally high and a "trouble code C3725: Fusing abnormally high temperature detection (Main of the heating side)" will be
displayed.
• If the heating roller thermistor/1 detects a predetermined temperature or more continuously, the temperature is determined to be
abnormally high and a "trouble code C3722: Fusing abnormally high temperature detection (Edge of the heating side)" will be
displayed.
• If the heating roller thermistor/2 detects a predetermined temperature or more continuously, the temperature is determined to be
abnormally high and a "trouble code C3726: Fusing abnormally high temperature detection (Center of the heating side)" will be
displayed.
• When the trouble code is displayed, printing will be prohibited.
(b) Second approach: hardware protection
• A different protection is provided when the CPU overruns, becoming unable to detect the malfunction of an abnormally high
temperature. If the fusing temperature sensor/2 (TEM2) detects an abnormal temperature, the heater relay of the DC power supply is
turned OFF through the printer control board. Power supply to the fusing heater lamp is then shut down.
• When the hardware circuit in the DC power unit detects the heater relay being OFF, the temperature is judged to be abnormally high.
Trouble code C3725: Fusing abnormally high temperature detection (TEM1:center) will be displayed.
• Through these control procedures, the power supply to the heater lamps can be shut down before the thermostat is activated. It
thereby suppresses damage to the fusing unit itself.
(c) Third approach: thermostat protection
• If detection of the abnormally high temperature through approaches 1 and 2 above is not possible due to a defective the heating roller
temperature sensor, heating roller thermistor or other reason, the thermostat comes into play to shut down the power supply to the
heater lamp.
(5) Fusing PPM control
(a) PPM control
• To achieve the intended level of fixability of printed images, the PPM control reduces the number of printed pages per minute by
widening the distance between sheets of paper.
PPM mode
Low temperature
environment mode
High humidity environment
mode *2
Paper curl suppression
mode
Control execution
Purpose
conditions
Room temperature at the
To achieve the intended
start of the print cycle is
level of fixability under low
less than 18 degrees
temperature environment
Environmental humidity at
To suppress occurrence of
the start of the print cycle
paper curl under high
is a predetermined value
humidity environment
or more
"Mode 3" is selected for
To suppress occurrence of
"Change Warm Up Time"
paper curl under
of the service mode
conditions other than high
humidity environment
P THEORY OF OPERATION > 1. bizhub C4000i/C3300i
Setting range
Specific controls
To prevent fixability from
being degraded in a multi-
print cycle, paper-to-paper
distance is widened to
thereby limit a decrease in
the fusing temperature.
Paper-to-paper distance is
widened in a multi-print
cycle run under high
humidity environment so
as to prevent paper from
curling, thereby achieving
a required fusing
temperature.
Paper-to-paper distance is
widened in a multi-print
cycle run under any
condition other than high
humidity environment so
as to prevent paper from
curling, thereby achieving
a required fusing
temperature.
P-45
Default setting
Print productivity *1
100%
90%
80%
70%: default
60% 5
0%
100%
70%
50%: default
100%
50%: default
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