Image formation process ................................................................................................... 27 Latent-image formation stage ........................................................................... 28 Primary charging .............................................................................. 28 Laser beam exposure ....................................................................... 28 Developing stage .............................................................................................. 29 Print cartridge ...................................................................................
29 Transfer stage ................................................................................................... 30 Fusing stage ..................................................................................... 30 Cleaning stage .................................................................................. 31 Toner detection .................................................................................................................. 32 Pickup, feed, and delivery system ......................................................................................................
33 Paper trays ........................................................................................................................ 33 Photo sensors and switches .............................................................................................. 34 Solenoids and clutches ...................................................................................................... 36 Tray 1 or Tray 2 .................................................................................................................................. 38 Pickup and feed unit ..........................................................................................................
38 Cassette paper size detection/cassette paper detection ................................... 38 Cassette pickup ................................................................................................. 38 Tray 1 paper pickup ........................................................................................................... 38 Paper pickup and feed ....................................................................................................... 39 Jam detection ....................................................................................................................
40 Additional tray ..................................................................................................................................... 41 Tray driver PCA ................................................................................................................. 41 Paper pickup and feed ....................................................................................................... 42 Media level and size detection ........................................................................................... 43 Jam detection ....................................................................................................................
43 2 Removal and replacement Removal and replacement strategy ................................................................................................... 46 General cautions during removal and replacement ........................................................... 46 Electrostatic discharge ...................................................................................... 46 Required tools ................................................................................................... 46 Types of screws ................................................................................................
47 Service approach ............................................................................................................................... 48 Before performing service .................................................................................................. 48 After performing service ..................................................................................................... 48 Post-service test ................................................................................................................ 48 Print-quality test ................................................................................................
48 Parts removal order ........................................................................................................... 50 Removal and replacement procedures .............................................................................................. 52 Print cartridge, cassettes, and sub cover ........................................................................... 52 Print cartridge .................................................................................................... 52 Tray cassette (Tray 2, Tray 3, or Tray 4) .......................................................... 54 vi ENWW