HP LASERJET ENTERPRISE M855 - Page 36

Figure 1-33 Duplex operation paper path ........................................................................................................ 55
Figure 1-34 Deskew rollers and width adjust ................................................................................................... 57
Figure 1-35 Separation angled ramp, separation roller, and separation pad ................................................... 58
Figure 1-36 Paper stopper ............................................................................................................................... 59
Figure 1-37 White backing and simplex selector .............................................................................................. 60
Figure 1-38 Duplex selector ............................................................................................................................. 61
Figure 1-39 Document feeder closed (book mode) .......................................................................................... 63
Figure 1-40 Document feeder open (maximum opening 70º) .......................................................................... 64
Figure 1-41 Photo sensors and switches electrical components ..................................................................... 65
Figure 1-42 Motors and solenoids electrical components ................................................................................ 68
Figure 1-43 Three main units of the pickup, feed, and delivery system ........................................................... 70
Figure 1-44 Cassette-pickup mechanism ......................................................................................................... 71
Figure 1-45 Cassette paper-size detection switches ....................................................................................... 72
Figure 1-46 Cassette lift mechanism ................................................................................................................ 74
Figure 1-47 Paper-level-detection mechanism ................................................................................................. 75
Figure 1-48 Multifeed prevention ...................................................................................................................... 76
Figure 1-49 Multipurpose tray pickup mechanism ............................................................................................ 77
Figure 1-50 Multipurpose tray last-paper detection .......................................................................................... 78
Figure 1-51 Paper-feed mechanism ................................................................................................................. 79
Figure 1-52 Skew-feed prevention ................................................................................................................... 80
Figure 1-53 Media sensor unit .......................................................................................................................... 81
Figure 1-54 Mechanism of the loop control ...................................................................................................... 84
Figure 1-55 Mechanism of the fuser depressurize control ............................................................................... 86
Figure 1-56 Duplexing unit ............................................................................................................................... 87
Figure 1-57 Location of each jam sensor and switch ....................................................................................... 90
Figure 1-58 Paper feeder installation and paper path ...................................................................................... 92
Figure 1-59 Paper feeder electrical components ............................................................................................. 94
Figure 1-60 Paper-feeder pickup-and-feed operation ...................................................................................... 97
Figure 1-61 Paper feeder sensor and switch location ..............................................................................
........ 99
Figure 1-62 HCI installation and paper path .................................................................................................. 101
Figure 1-63 HCI electrical components .......................................................................................................... 102
Figure 1-64 HCI electrical components .......................................................................................................... 105
Figure 1-65 HCI lift-up operation mechanism ................................................................................................. 107
Figure 1-66 HCI jam sensor locations ............................................................................................................ 108
Figure 1-67 IPTU installation and paper path ................................................................................................ 110
Figure 1-68 IPTU driver signal flow ................................................................................................................ 110
Figure 1-69 Motors and sensors of the IPTU ................................................................................................. 111
Figure 1-70 IPTU jam detection sensors ........................................................................................................ 113
Figure 1-71 Staple/stacker installation and paper path .................................................................................. 114
Figure 1-72 Stapler/stacker with hole puncher assembly installation and paper path ................................... 115
Figure 1-73 Stapler/stacker controller signal flow .......................................................................................... 116
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