HP LASERJET ENTERPRISE M725dn Troubleshooting Manual page 27

List of figures
Figure 1-1 Function structure ................................................................................................................... 2
Figure 1-2 Engine control system ............................................................................................................. 4
Figure 1-3 DC controller PCA ................................................................................................................. 5
Figure 1-4 Motor locations ..................................................................................................................... 7
Figure 1-5 Fan locations ........................................................................................................................ 9
Figure 1-6 Low-voltage power-supply PCA ............................................................................................. 11
Figure 1-7 High-voltage power-supply PCA ............................................................................................ 14
Figure 1-8 Fuser components ................................................................................................................ 16
Figure 1-9 Fuser control system ............................................................................................................. 17
Figure 1-10 Laser scanner system .......................................................................................................... 21
Figure 1-11 Image-formation system ...................................................................................................... 23
Figure 1-12 Image-formation components .............................................................................................. 24
Figure 1-13 Image-formation process .................................................................................................... 25
Figure 1-14 Primary charging ............................................................................................................... 26
Figure 1-15 Laser-beam exposure ......................................................................................................... 26
Figure 1-16 Developing ....................................................................................................................... 27
Figure 1-17 Image transfer ................................................................................................................... 27
Figure 1-18 Separation from the drum ................................................................................................... 28
Figure 1-19 Fusing .............................................................................................................................. 29
Figure 1-20 Drum cleaning .................................................................................................................. 29
Figure 1-21 Toner cartridge components ................................................................................................ 30
Figure 1-22 Drum discharge ................................................................................................................. 31
Figure 1-23 Transfer roller cleaning ...................................................................................................... 32
Figure 1-24 Pickup, feed, and delivery system ........................................................................................ 33
Figure 1-25 Pickup, feed, and delivery system sensors and switches .......................................................... 34
Figure 1-26 Pickup, feed, and delivery-system solenoid and motors ........................................................... 36
Figure 1-27 Pickup-and-feed block ........................................................................................................ 37
Figure 1-28 Cassette pickup mechanism ................................................................................................ 38
Figure 1-29 Cassette lift operation ........................................................................................................ 40
Figure 1-30 Cassette multiple-feed prevention ......................................................................................... 41
Figure 1-31 MP tray pickup .................................................................................................................. 42
Figure 1-32 MP tray multiple-feed prevention .......................................................................................... 43
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