Clean the print engine paper path ..................................................................................... 97 4 Theory of operation ...................................................................................................................................... 99 MFP system overview ...................................................................................................................... 100 Print engine ...................................................................................................................................... 102 Basic sequence of operation ...........................................................................................
102 Power-on sequence ......................................................................................................... 103 Engine control system ..................................................................................................... 103 DC controller PCA ........................................................................................... 104 High-voltage power-supply PCA ..................................................................... 105 Low-voltage power-supply PCA ...................................................................... 108 Video interface control ....................................................................................
109 Laser/scanner system ...................................................................................................... 110 Image-formation system .................................................................................................. 110 Electrostatic latent-image formation block ...................................................... 112 Step 1: primary charging ................................................................ 112 Step 2: laser-beam exposure ......................................................... 113 Development block .......................................................................................... 113 Step 3:
developing .......................................................................... 113 Transfer block ................................................................................................. 114 Step 4: image transfer .................................................................... 114 Step 5: separation from the drum ................................................... 114 Fuser block ...................................................................................................... 115 Step 6: fusing ..................................................................................
115 Drum-cleaning block ....................................................................................... 115 Step 7: drum cleaning ..................................................................... 115 Print cartridge .................................................................................................. 115 Memory tag ..................................................................................................... 116 Pickup-and-feed-system .................................................................................................. 117 Cassette paper size and presence detection ..................................................
120 Upper and lower cassette pickup mechanism ................................................. 121 Multiple-feed prevention mechanism .............................................................. 123 Tray 1 (multipurpose tray) pickup mechanism ................................................ 124 Skew-correction mechanism (registration) ...................................................... 125 Fuser/delivery block ........................................................................................ 126 Loop control ....................................................................................................
126 Jam detection .................................................................................................. 127 Duplexing unit ................................................................................................................................... 129 Duplexing reverse/feed operation .................................................................................... 130 Duplexing feed operation ................................................................................................. 131 Duplexing horizontal registration function ........................................................................
132 Duplexing unit jam detection ............................................................................................ 133 1 x 500-sheet and 3 x 500-sheet high-capacity input feeder ............................................................ 134 vi ENWW