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