HP policy on non-HP print cartridges ................................................................................. 81
HP fraud hotline and Web site ........................................................................................... 81
Replace supplies ............................................................................................................... 81
Supplies life ....................................................................................................... 81
Locate supplies ................................................................................................. 81
Supply replacement guidelines ......................................................................... 82
Change print cartridges ..................................................................................... 83
Change the toner collection unit ........................................................................ 86
Install memory ................................................................................................... 89
Install DDR2 memory DIMMs ........................................................... 89
Enable memory for Windows ............................................................ 92
Install an HP Jetdirect or EIO print server card or EIO hard disk ..... 92
Clean the product ............................................................................................................................... 96
Clean the exterior .............................................................................................................. 96
Clean spilled toner ............................................................................................................. 96
Clean the fuser .................................................................................................................. 96
Product updates ................................................................................................................................. 97
Determine the current firmware version ............................................................................. 97
Download new firmware from the HP Web site ................................................................. 97
Transfer the new firmware to the product .......................................................................... 97
Use the HP Easy Firmware Upgrade utility to update the firmware .................. 97
Use FTP to upload the firmware through a browser ......................................... 98
Use FTP to upgrade the firmware on a network connection ............................. 99
Use HP Web Jetadmin to upgrade the firmware ............................................... 99
Use Microsoft Windows commands to upgrade the firmware ......................... 100
Upgrade the HP Jetdirect firmware .................................................................................. 100
5 Theory of operation
Basic operation ................................................................................................................................. 104
Sequence of operation ..................................................................................................... 104
Engine-control system ...................................................................................................................... 106
DC controller .................................................................................................................... 107
Solenoids ........................................................................................................ 107
Clutches .......................................................................................................... 108
Switches .......................................................................................................... 108
Sensors ........................................................................................................... 109
Motors and fans .............................................................................................. 109
High-voltage power supply .............................................................................................. 111
Low-voltage power supply ............................................................................................... 113
Overcurrent/overvoltage protection ................................................................. 114
Safety .............................................................................................................. 114
Voltage detection ............................................................................................ 114
Sleep (powersave) mode ................................................................................ 114
ENWW v
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