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Paper feeder ..........................................................................................................................197
Pickup/delivery sequence ...............................................................................................198
Paper jam detection ........................................................................................................199
6 Removal and replacement
Chapter contents ...................................................................................................................201
Introduction ............................................................................................................................204
Removal and replacement strategy ................................................................................204
Repair notices .................................................................................................................204
Caution regarding electrostatic discharge (ESD) ...........................................................204
Required tools .................................................................................................................204
Types of screws ..............................................................................................................205
Supplies .................................................................................................................................207
Print cartridges and transfer unit ....................................................................................208
Covers ...................................................................................................................................209
Front door removal .........................................................................................................209
Left cover removal ..........................................................................................................210
Left front cover removal ..................................................................................................211
Right cover removal ........................................................................................................213
Top cover removal ..........................................................................................................214
Upper rear door removal ................................................................................................214
Rear cover removal ........................................................................................................215
Lower rear door (rear output bin) removal .....................................................................215
Tray 1 (multipurpose) removal .......................................................................................216
Main Assemblies ...................................................................................................................217
Transfer unit removal ......................................................................................................218
Print cartridge removal ...................................................................................................219
Fuser removal .................................................................................................................220
Face-down delivery assembly removal ..........................................................................221
Laser/scanner assembly removal ...................................................................................222
Image drive assembly removal .......................................................................................223
Developing engaging drive assembly removal ...............................................................225
Pick-up/feed assembly removal .....................................................................................225
Main assembly parts .............................................................................................................236
Tray 1 pick-up roller removal ..........................................................................................237
Tray 1 separation pad removal .......................................................................................237
Tray 2 pick-up roller removal ..........................................................................................238
Tray 2 separation pad removal .......................................................................................238
Secondary transfer charging roller removal ...................................................................239
Fuser sleeve unit removal ..............................................................................................239
Pressure roller removal ..................................................................................................239
Main thermistor/sub-thermistor removal .........................................................................239
Thermoswitch removal ...................................................................................................239
Feed guide unit removal .................................................................................................240
Swing guide removal, right .............................................................................................242
Swing guide removal, left ...............................................................................................245
Switches ................................................................................................................................250
Door Switch (SW1) removal ...........................................................................................250
Test print switch (SW1001) removal ..............................................................................251
Power switch (SW3001) removal ...................................................................................251
Sensors .................................................................................................................................252
Tray 1 (multipurpose tray) paper sensor (PS1) removal ................................................253
Tray 2 (cassette) paper sensor (PS2) removal ..............................................................253
Registration paper sensor (PS4) removal ......................................................................254
Media sensor (PS5) removal ..........................................................................................255
viii ENWW