Konica Minolta bizhub C658 Service Manual page 1876

bizhub C658/C558/C458/C368/C308/C258
[6]
[5]
[1] Loop length: large
[3] Fusing loop sensor (PS2)
[5] Loop length: small
Operation timing
• It starts controlling when the front-edge of the paper reaches to the predetermined position before the fusing roller.
• The fusing speed is decelerated so that a loop is formed in the paper between the 2nd transfer roller and the fusing roller.
• When the paper loop amount is large, the fusing loop sensor is unblocked, and the fusing speed is increased.
• When the paper loop amount is small, the fusing loop sensor is blocked, and the fusing speed is decreased.
• The fusing speed is increased or decreased as necessary to make sure that the paper loop amount falls within a predetermined range,
thereby absorbing a difference between the fusing speed and image transfer speed.
• The fusing loop control will finish after the trailing of the paper passes the 2nd transfer roller.
Fusing speed adjustment
• If double transferred images or brush effects occur due to inadequate paper loop before fusing, adjust the fusing speed using [Service
Mode] -> [Machine] -> [Fusing transport speed].
• For detailed adjustment method, see "
13.3.3 Fusing pressure/retraction control
• To maintain durability of the fusing belt, the fusing pressure roller is retracted *1 from the fusing belt during any time other than a print
cycle. (The roller is, however, retracted during a print cycle using envelopes.)
*1: The pressure roller does not completely retract from the fusing belt but is slightly pressed to the fusing belt.
• The fusing pressure roller is pressed against, and retracted from, the fusing belt by rotating the pressure cam through forward or backward
rotation of the fusing pressure motor.
• The fusing pressure home sensor detects the pressure roller at its pressure position.
• The position at which the fusing pressure roller is retracted is controlled by the period of time (number of pulses) through which the fusing
pressure motor is rotated.
• When there is no change in the output of the fusing pressure home sensor even after the lapse of a predetermined period of time after the
fusing pressure motor has started rotating, the machine determines that there is a pressure/retraction fault and displays the "Trouble code
C3101: Pressure roller separation failure" message or "Trouble code C3103: Pressure roller release failure" message.
O THEORY OF OPERATION bizhub C658/C558/C458/C368/C308/C258 > 13.
[2]
[4]
[6]
I.5.4.3 Fusing Transport Speed".
O-101
FUSING SECTION (bizhub C458/C368/C308/C258)
[1]
[2]
[3]
[4]
Actuator
2nd transfer roller
Fusing roller