Konica Minolta bizhub C658 Service Manual page 1882

bizhub C658/C558/C458/C368/C308/C258
Booklet
Image quality Select color
Gloss mode
Toner save (density 50%)
Edge enhancement
Negative-positive reversal
Maximum black density
Line width
Character decoration
Character size
Image object
Stamp/page No watermarks
printing
No overlay
No copy security
No header/footer
No management number
• *1: Copies are not included in the control
• *2: Bold characters are not included in the control
13.3.8 Protection from abnormal temperatures
(1) 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 thermistor1 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 thermistor2 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.
(2) 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 heating roller temperature sensor detects an abnormal temperature, the heater relay of the DC power supply is turned OFF through
the MFP board. Power supply to the fusing heater lamp is then shut down.
• When the hardware circuit in the MFP board detects the heater relay being OFF, the temperature is judged to be abnormally high.
Trouble code C3731: Fusing abnormally high temperature detection (Hard protector) 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.
(3) 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.
13.3.9 Fusing PPM control
(1) 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
Function
Control execution
conditions
Room temperature at the To achieve the intended
start of the print cycle is level of fixability under low
18°C or less temperature environment
Environmental humidity at To suppress occurrence of
the start of the print cycle paper curl under high
is a predetermined value or humidity environment
more
O THEORY OF OPERATION bizhub C658/C558/C458/C368/C308/C258 > 13.
FUSING SECTION (bizhub C458/C368/C308/C258)
No
Black mode only
No
No
No
No
80% or more to 90% or less
1.5pt or less
Normal characters only*2
16pt or less
No
No
No
No
No
No
Purpose 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.
O-107
Execution conditions
Print productivity *1
100%: default value
90%
80%
70%
60%
50%
100%: default value
70%
50%