Konica Minolta bizhub C250 Service Manual page 31

17.1 Drive ................................................................................................................... 84
17.2 Operation............................................................................................................ 85
17.2.1 Bypass paper take-up control ..................................................................... 85
17.2.2 Paper empty detection ................................................................................ 85
17.2.3 Paper width detection ................................................................................. 86
17.2.4 Bypass paper lifting motion control............................................................. 87
18. Bypass section (bizhub C252) .............................................................................. 88
18.1 Composition ....................................................................................................... 88
18.2 Drive ................................................................................................................... 89
18.3 Operation............................................................................................................ 90
18.3.1 Bypass paper take-up control ..................................................................... 90
18.3.2 Paper empty detection ................................................................................ 90
18.3.3 Bypass paper lifting motion control............................................................. 91
18.3.4 Paper size detection ................................................................................... 92
19. Registration roller section ..................................................................................... 94
19.1 Composition ....................................................................................................... 94
19.2 Drive ................................................................................................................... 94
19.3 Operation............................................................................................................ 95
19.3.1 Registration roller control............................................................................ 95
19.3.2 OHP detection ............................................................................................ 96
19.3.3 Deceleration control.................................................................................... 97
20. Fusing section....................................................................................................... 98
20.1 Composition ....................................................................................................... 98
20.2 Drive ................................................................................................................. 100
20.3 Operation.......................................................................................................... 101
20.3.1 Fusing roller drive control ......................................................................... 101
20.3.2 Heater lamp construction.......................................................................... 103
20.3.3 Thermistor construction ............................................................................ 103
20.3.4 Thermostat construction ........................................................................... 104
20.3.5 Fusing roller pressure/retraction mechanism............................................ 104
20.3.6 Fusing roller small amount rotation control............................................... 107
20.3.7 Paper winding detection control................................................................ 107
20.3.8 Fusing temperature control chart.............................................................. 108
20.3.9 Warm-up control ....................................................................................... 109
20.3.10 Temperature control during low power mode............................................ 109
20.3.11 Protecting from the abnormally high temperature..................................... 110
20.3.12 Abnormally high temperature detection (software protection) .................. 111
20.3.13 Abnormally high temperature detection (hardware protection)................. 111
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Theory of operation ver. 3.0 Aug. 2006