4
Operational overview
This chapter contains information about the following topics.
Basic functions
........................................................................................................................
68
Basic sequence of operation (formatter-to-printer)
.................................................................
69
Basic sequence of operation (scanner)
...................................................................................
71
Formatter system
....................................................................................................................
73
Central processing unit
.....................................................................................................
73
Line interface unit (LIU)
....................................................................................................
73
Motor controller PCA
........................................................................................................
73
Flash memory
...................................................................................................................
73
Standard boot process
.....................................................................................................
73
RAM
..................................................................................................................................
74
Parallel interface or universal serial bus (USB) interface
.................................................
74
Control panel
....................................................................................................................
74
EconoMode (Draft mode)
.................................................................................................
74
MEt
....................................................................................................................................
75
Enhanced I/O
....................................................................................................................
75
PJL overview
....................................................................................................................
75
Scanner and ADF functions and operation
.............................................................................
76
Scanner functions
.............................................................................................................
76
Scanner operation
............................................................................................................
77
ADF operation
...................................................................................................................
77
ADF paper path and ADF sensors
...................................................................................
78
ADF jam detection
............................................................................................................
78
Printer functions and operation
...............................................................................................
79
Engine control unit (power system)
..................................................................................
79
Image-formation system
...................................................................................................
85
Printer paper-feed system
................................................................................................
86
Jam detection
...................................................................................................................
87
Fax functions and operation
....................................................................................................
89
PSTN operation
................................................................................................................
89
The fax subsystem
...........................................................................................................
89
Formatter in the fax subsystem
........................................................................................
89
LIU in the fax subsystem
..................................................................................................
89
Fax page storage in flash memory
...................................................................................
92
ENWW
67