HP LaserJet Pro M402d

List of gures
Figure 1-1 Relationship between the main printer systems ............................................................................................... 3
Figure 1-2 Engine-control system ........................................................................................................................................ 5
Figure 1-3 DC controller block diagram ................................................................................................................................ 6
Figure 1-4 Low-voltage power-supply circuit ...................................................................................................................... 9
Figure 1-5 High-voltage power supply circuits .................................................................................................................. 12
Figure 1-6 Fuser components ............................................................................................................................................ 13
Figure 1-7 Fuser control ..................................................................................................................................................... 14
Figure 1-8 Laser/scanner system ....................................................................................................................................... 16
Figure 1-9 Image-formation system .................................................................................................................................. 18
Figure 1-10 Fuser motor (M1) and image formation components .................................................................................... 19
Figure 1-11 Toner-level sensor .......................................................................................................................................... 20
Figure 1-12 Image-formation process ............................................................................................................................... 20
Figure 1-13 Primary charging ............................................................................................................................................. 21
Figure 1-14 Laser-beam exposure ..................................................................................................................................... 22
Figure 1-15 Development ................................................................................................................................................... 22
Figure 1-16 Primary transfer .............................................................................................................................................. 23
Figure 1-17 Separation ....................................................................................................................................................... 24
Figure 1-18 Fusing .............................................................................................................................................................. 24
Figure 1-19 Drum cleaning ................................................................................................................................................. 25
Figure 1-20 Toner cartridge system ................................................................................................................................... 26
Figure 1-21 Pickup, feed, and delivery system .................................................................................................................. 28
Figure 1-22 Sensors and switches for the pickup, feed, and delivery system .................................................................. 29
Figure 1-23 Motors, solenoids, and clutches ..................................................................................................................... 31
Figure 1-24 Jam detection sensors .................................................................................................................................... 32
Figure 1-25 Optional Tray 3 paper path ............................................................................................................................. 35
Figure 1-26 Paper feeder controller ................................................................................................................................... 36
Figure 1-27 Electrical components, pickup and feed ......................................................................................................... 37
Figure 2-1 Cross-sectional view of printer ......................................................................................................................... 51
Figure 2-2 Cross-sectional view of 500–sheet paper feeder ............................................................................................ 52
Figure 2-3 DC controller PCA connectors ........................................................................................................................... 53
Figure 2-4 Paper feeder controller PCA connectors ........................................................................................................... 54
Figure 2-5 M402, M403 external plugs and ports locations .............................................................................................. 54
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