HP LASERJET ENTERPRISE M855 - Page 35

List of figures
Figure 1-1 Relationship between the main product systems ............................................................................. 2
Figure 1-2 Engine-control system ...................................................................................................................... 7
Figure 1-3 DC controller block diagram .............................................................................................................. 8
Figure 1-4 Low-voltage power supply block diagram ....................................................................................... 15
Figure 1-5 High-voltage power supply block diagram ...................................................................................... 19
Figure 1-6 Fuser-control circuit ........................................................................................................................ 21
Figure 1-7 Fuser system block diagram ........................................................................................................... 22
Figure 1-8 Laser/scanner system ..................................................................................................................... 26
Figure 1-9 Image-formation system ................................................................................................................. 27
Figure 1-10 Image-formation process .............................................................................................................. 28
Figure 1-11 Pre-exposure ................................................................................................................................ 29
Figure 1-12 Primary charging ........................................................................................................................... 29
Figure 1-13 Laser-beam exposure ................................................................................................................... 30
Figure 1-14 Development ................................................................................................................................. 30
Figure 1-15 Primary transfer ............................................................................................................................ 31
Figure 1-16 Secondary transfer ........................................................................................................................ 31
Figure 1-17 Separation ..................................................................................................................................... 32
Figure 1-18 Fusing ........................................................................................................................................... 32
Figure 1-19 ITB cleaning .................................................................................................................................. 33
Figure 1-20 Drum cleaning ............................................................................................................................... 33
Figure 1-21 Toner-cartridge system ................................................................................................................. 34
Figure 1-22 Imaging-drum system ................................................................................................................... 37
Figure 1-23 Developing roller engagement and disengagement control ......................................................... 38
Figure 1-24 ITB unit .......................................................................................................................................... 39
Figure 1-25 Three states of primary-transfer roller engagement and disengagement ..................................... 41
Figure 1-26 Secondary-transfer roller unit ........................................................................................................ 43
Figure 1-27 Calibration mechanism ................................................................................................................. 44
Figure 1-28 Color-sensor control ...................................................................................................................... 48
Figure 1-29 Gray-axis correction ...................................................................................................................... 49
Figure 1-30 Document feeder cross section .................................................................................................... 51
Figure 1-31 Document feeder sensor positions ............................................................................................... 52
Figure 1-32 Simplex operation paper path ..........................
............................................................................. 53
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