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
