HP LaserJet Enterprise M552 - Page 23

List of gures
Figure 1-1 Relationship between the main printer systems ............................................................................................... 3
Figure 1-2 System block diagram ......................................................................................................................................... 4
Figure 1-3 Engine-control system ...................................................................................................................................... 11
Figure 1-4 DC controller block diagram .............................................................................................................................. 12
Figure 1-5 Low-voltage power-supply circuit .................................................................................................................... 18
Figure 1-6 High-voltage power supply circuits .................................................................................................................. 21
Figure 1-7 Fuser components ............................................................................................................................................ 23
Figure 1-8 Fuser temperature-control circuit .................................................................................................................... 25
Figure 1-9 Laser/scanner system ....................................................................................................................................... 27
Figure 1-10 Image-formation system ................................................................................................................................ 30
Figure 1-11 Motors ............................................................................................................................................................. 31
Figure 1-12 Sensors ............................................................................................................................................................ 32
Figure 1-13 Image-formation process ............................................................................................................................... 33
Figure 1-14 Pre-exposure .................................................................................................................................................. 35
Figure 1-15 Primary charging ............................................................................................................................................. 35
Figure 1-16 Laser-beam exposure ..................................................................................................................................... 36
Figure 1-17 Development ................................................................................................................................................... 36
Figure 1-18 Primary transfer .............................................................................................................................................. 37
Figure 1-19 Secondary transfer ......................................................................................................................................... 37
Figure 1-20 Separation ....................................................................................................................................................... 38
Figure 1-21 Fusing .............................................................................................................................................................. 38
Figure 1-22 ITB cleaning ..................................................................................................................................................... 39
Figure 1-23 Drum cleaning ................................................................................................................................................. 39
Figure 1-24 Toner cartridge system ................................................................................................................................... 41
Figure 1-25 Developer roller engagement and disengagement control ........................................................................... 43
Figure 1-26 ITB unit ............................................................................................................................................................ 45
Figure 1-27 Three states of primary-transfer roller engagement and disengagement ................................................... 46
Figure 1-28 ITB cleaning process ....................................................................................................................................... 48
Figure 1-29 Pickup, feed, and delivery system .................................................................................................................. 50
Figure 1-30 Photo sensors and switches ........................................................................................................................... 51
Figure 1-31 Motors, clutches, and solenoids ..................................................................................................................... 53
Figure 1-32 Tray 1 pickup mechanism ............................................................................................................................... 55
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