HP LaserJet Pro 500 - Page 21

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 High-voltage power supply circuits ........................................................................................ 13
Figure 1-5 Low-voltage power-supply circuit ........................................................................................... 14
Figure 1-6 Fuser (fixing) components ..................................................................................................... 19
Figure 1-7 Fuser temperature-control circuit ............................................................................................ 20
Figure 1-8 Laser/scanner system ........................................................................................................... 23
Figure 1-9 Image formation system ........................................................................................................ 25
Figure 1-10 Image formation process .................................................................................................... 26
Figure 1-11 Pre-exposure ..................................................................................................................... 27
Figure 1-12 Primary charging ............................................................................................................... 27
Figure 1-13 Laser-beam exposure ......................................................................................................... 28
Figure 1-14 Development ..................................................................................................................... 28
Figure 1-15 Primary transfer ................................................................................................................. 29
Figure 1-16 Secondary transfer ............................................................................................................ 29
Figure 1-17 Separation ....................................................................................................................... 30
Figure 1-18 Fusing .............................................................................................................................. 30
Figure 1-19 ITB cleaning ...................................................................................................................... 31
Figure 1-20 Drum cleaning .................................................................................................................. 31
Figure 1-21 Toner-cartridge system ....................................................................................................... 32
Figure 1-22 Developing-roller engagement and disengagement control ..................................................... 33
Figure 1-23 ITB unit ............................................................................................................................. 35
Figure 1-24 Three states of primary-transfer-roller engagement and disengagement ..................................... 36
Figure 1-25 ITB cleaning process .......................................................................................................... 38
Figure 1-26 Toner patterns for calibration .............................................................................................. 39
Figure 1-27 Switches and sensors for the pickup, feed, and de
livery system ............................................... 41
Figure 1-28 Motors and solenoids for the pickup, feed, and delivery system .............................................. 42
Figure 1-29 Three main units of the pickup, feed, and delivery system ....................................................... 43
Figure 1-30 Pickup-and-feed unit ........................................................................................................... 44
Figure 1-31 Tray-pickup mechanism ...................................................................................................... 45
Figure 1-32 Tray presence sensor ......................................................................................................... 46
ENWW xix
draft version