4
Operational overview
This chapter contains information about the following topics.
Basic functions (all models)
....................................................................................................
70
Basic sequence of operation
...................................................................................................
71
Formatter system
....................................................................................................................
75
Central processing unit
.....................................................................................................
75
Line interface unit (HP LaserJet 3015 and 3030 only)
.....................................................
75
Standard boot process
.....................................................................................................
75
RAM
..................................................................................................................................
76
Parallel interface or universal serial bus (USB) interface
.................................................
76
Control panel
....................................................................................................................
76
EconoMode
.......................................................................................................................
76
MEt
....................................................................................................................................
77
Enhanced I/O
....................................................................................................................
77
PJL overview
....................................................................................................................
77
Printer functions (all models)
...................................................................................................
78
Engine control system (engine control unit and power-supply assembly)
........................
78
Image-formation system
....................................................................................................
83
Print cartridge
....................................................................................................................
84
Printer paper-feed system
.................................................................................................
84
Jam detection in the printer
..............................................................................................
85
HP LaserJet 3015 all-in-one unique components
....................................................................
87
Basic operation
..................................................................................................................
87
HP LaserJet 3020 and 3030 all-in-one unique components
....................................................
93
Scanner and ADF functions and operation
......................................................................
93
Fax functions and operation (HP LaserJet 3015 and 3030 only)
...........................................
96
PSTN operation
................................................................................................................
96
The fax subsystem
...........................................................................................................
96
Formatter in the fax subsystem
........................................................................................
96
LIU in the fax subsystem
..................................................................................................
96
Fax page storage in flash memory
...................................................................................
99
ENWW
69