HP 2820, 2830, 2840 3 Maintenance, 4 Theory of operation

Print Settings tab..................................................................................................	57
Fax Settings tab...................................................................................................	57
Copy Settings tab.................................................................................................	57
Network Settings tab............................................................................................	57
HP Toolbox links...................................................................................................................	58
Other links.............................................................................................................................	58
Embedded Web server..........................................................................................................................	59
Features................................................................................................................................	59
3 Maintenance
Chapter contents...................................................................................................................................	61
Life expectancies of components..........................................................................................................	62
Cleaning the device...............................................................................................................................	64
Cleaning the device exterior and scanner............................................................................	64
Cleaning the paper path.......................................................................................................	65
Managing supplies.................................................................................................................................	68
Supplies life...........................................................................................................................	68
Checking and ordering supplies...........................................................................................	68
To check status and order supplies using the control panel................................	68
To check status and order supplies using the HP Toolbox.................................	69
Storing supplies....................................................................................................................	69
Replacing and recycling supplies.........................................................................................	69
HP policy for non-HP supplies..............................................................................................	69
Resetting the device for non-HP supplies............................................................	69
HP fraud hotline....................................................................................................................	70
4 Theory of operation
Chapter contents...................................................................................................................................	71
Introduction............................................................................................................................................	72
Engine control system...........................................................................................................................	76
Basic sequence of operation................................................................................................	76
Power-on sequence..............................................................................................................	78
Motors and fans....................................................................................................................	79
Laser/scanner system...........................................................................................................................	80
Pickup and feed system........................................................................................................................	81
Optional tray 2.......................................................................................................................	83
Jam detection........................................................................................................................	84
Photosensors and switches..................................................................................................	85
Solenoids and clutches.........................................................................................................	87
Printed circuit assemblies.....................................................................................................	89
Image-formation system........................................................................................................................	91
Image-formation process......................................................................................................	93
Latent-image-formation stage...............................................................................................	94
Step 1: primary charging......................................................................................	94
Step 2: laser-beam exposure...............................................................................	94
Developing stage..................................................................................................................	95
Step 3: auxiliary developing.................................................................................	95
Step 4: developing...............................................................................................	95
Transfer stage.......................................................................................................................	96
Step 5: primary transfer........................................................................................	96

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