Transfer the new firmware to the product ......................................................... 96 Use FTP to upload the firmware through a browser ......................... 96 Use FTP to upgrade the firmware on a network connection ............ 97 Use HP Web Jetadmin to upgrade the firmware .............................. 98 Use Microsoft Windows commands to upgrade the firmware .......... 98 Upgrade the HP Jetdirect firmware ................................................................... 98 5 Theory of operation Basic operation .................................................................................................................................
102 Major print systems .......................................................................................................... 102 Internal components ........................................................................................................ 103 Operating sequence ........................................................................................................ 106 Engine-control system ...................................................................................................................... 107 DC controller PCA ...........................................................................................................
107 Motors and fans ............................................................................................................... 108 Failure detection .............................................................................................. 109 Motor failure .................................................................................... 109 Fan motor failure ............................................................................ 109 Engine power supply ....................................................................................... 109 Fuser-control circuit ........................................................................
109 Low-voltage power supply .............................................................. 111 High-voltage power supply ............................................................. 111 Overcurrent/overvoltage protection ................................................ 112 Laser/scanner system ...................................................................................................................... 113 Laser failure detection ..................................................................................................... 114 Image-formation system ...................................................................................................................
115 Image-formation process ................................................................................................. 115 Block 1: Latent image formation ...................................................................... 116 Step 1: Primary charging ................................................................ 116 Step 2: Laser-beam exposure ........................................................ 117 Block 2: Developing ........................................................................................ 117 Step 3: Developing ......................................................................... 117 Block 3:
Transfer ............................................................................................. 117 Step 4: Transfer .............................................................................. 118 Step 5: Separation .......................................................................... 118 Block 4: Fusing ................................................................................................ 118 Step 6: Fusing ................................................................................ 119 Block 5: Drum cleaning ................................................................................... 119 Step 7:
Drum cleaning .................................................................... 119 Step 8: Drum charge elimination .................................................... 119 Pickup, feed, and delivery system .................................................................................................... 121 Pickup-and-feed block ..................................................................................................... 122 Fuser/delivery block ......................................................................................................... 123 vi ENWW