Chapter contents ................................................................................................................................ 55 Basic operation ................................................................................................................................... 56 ADF/scanner system ......................................................................................................... 57 ADF ................................................................................................................... 57 Sensors in the ADF ..........................................................................
57 ADF paper path ................................................................................ 57 Scanner ............................................................................................................. 58 Formatter ........................................................................................................................... 59 Engine control unit (ECU) .................................................................................................. 60 Pickup/feed/delivery system ..............................................................................................
62 Laser/scanner system ........................................................................................................ 63 Image-formation system .................................................................................................... 64 Step 1: Primary charging ................................................................................... 65 Step 2: Laser beam exposure ........................................................................... 65 Step 3: Developing ............................................................................................ 65 Step 4:
Transfer ................................................................................................ 66 Step 5: Separation ............................................................................................ 66 Step 6: Fusing ................................................................................................... 67 Step 7: Drum cleaning ....................................................................................... 67 Internal components ...........................................................................................................................
68 Timing ................................................................................................................................................. 69 Print cartridge memory system ........................................................................................................... 73 5 Removal and replacement Chapter contents ................................................................................................................................ 75 Introduction .........................................................................................................................................
77 Removal and replacement strategy .................................................................................. 77 Electrostatic discharge ....................................................................................................... 77 User-replaceable parts ...................................................................................................... 77 Required tools .................................................................................................................... 78 Before performing service ..................................................................................................
78 Parts removal order ........................................................................................................... 79 Automatic document feeder (ADF) and scanner assemblies ............................................................. 80 ADF assembly ................................................................................................................... 80 ADF cover ......................................................................................................... 80 ADF input tray ...................................................................................................
82 Control panel ..................................................................................................... 84 ADF ................................................................................................................... 87 Scanner assembly ............................................................................................................. 90 Covers ................................................................................................................................................ 94 Right-side cover .................................................................................................................
94 Formatter shield ................................................................................................................. 95 Fax cover ........................................................................................................................... 96 Left-side cover ................................................................................................................... 97 Legal cover (dust cover) .................................................................................................. 100 Back cover .......................................................................................................................
101 I/O cover .......................................................................................................................... 103 Fax rail ............................................................................................................................. 104 Top cover ......................................................................................................................... 105 Front, right cover .............................................................................................................. 109 ENWW v