HP — HP LaserJet Enterprise MFP M725 - Troubleshooting Service Manual (EN)

List of figures Figure 1-1 Function structure ................................................................................................................... 2 Figure 1-3 DC controller PCA ................................................................................................................. 5 Figure 1-2 Engine control system ............................................................................................................. 4 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 1-13 Image-formation process ....................................................................................................

25 Figure 1-12 Image-formation components .............................................................................................. 24 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 1-23 Transfer roller cleaning ...................................................................................................... 32 Figure 1-22 Drum discharge ................................................................................................................. 31 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 ENWW xxv