Developing stage ..............................................................................................................86 Transfer stage ...................................................................................................................87 Fusing stage .....................................................................................................................89 Print cartridge ...................................................................................................................93 Imaging-drum E-label .......................................................................................................94 5 Removal and replacement Chapter contents .....................................................................................................................97 Introduction ..............................................................................................................................99 Removal and replacement strategy ..................................................................................99 Electrostatic discharge .....................................................................................................99 User-replaceable parts .....................................................................................................99 Required tools ...................................................................................................................99 Before performing service .....................................................................................................101 Pre-service procedures ..................................................................................................101 Parts removal order ........................................................................................................102 Removal and replacement ....................................................................................................103 Imaging drum ..................................................................................................................103 Print cartridges ................................................................................................................103 Fuser cover (and fuser) ..................................................................................................104 Right- and left-side covers ..............................................................................................106 Control panel ..................................................................................................................107 On-off switch ...................................................................................................................109 Interface cover ................................................................................................................110 Formatter assemblies .....................................................................................................111 Fuser motor ....................................................................................................................116 Dc controller ....................................................................................................................117 Optional tray 2 (250-sheet tray) ......................................................................................118 Carousel-engagement motor ..........................................................................................120 Front lower cover ............................................................................................................121 Back cover ......................................................................................................................122 Top cover ........................................................................................................................123 Top door .........................................................................................................................125 Air duct and fan ...............................................................................................................127 Laser/scanner assembly .................................................................................................128 Front cover ......................................................................................................................130 Density sensor and top-of-page sensor .........................................................................130 E-label reader (for imaging-drum E-labels) ....................................................................132 Tray 1 (multipurpose tray) ..............................................................................................133 Tray 1 separation pad assembly ....................................................................................135 Gear assembly ................................................................................................................136 Waste-toner sensor ........................................................................................................138 Rotary-drive assembly ....................................................................................................139 Top plate .........................................................................................................................142 Print-cartridge carousel ..................................................................................................145 Aligning the carousel gears ............................................................................................149 Registration-roller assembly ...........................................................................................150 Toner-catch tray ..............................................................................................................151 Transfer-roller plate ........................................................................................................152 Transfer roller .................................................................................................................152 Feed-drive shaft ..............................................................................................................153 ECU pan .........................................................................................................................154 Sub-high-voltage transformer PCA ................................................................................157 High-voltage transformer PCA .......................................................................................158 Low-voltage PCA ............................................................................................................159 ENWW v