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