Sleep and wake
.................................................................................................................
98
5
Theory of operation
Basic operation
.................................................................................................................................
100
Sequence of operation
.....................................................................................................
101
Product start up sequence (turn on product)
...................................................................
103
Timing chart
.....................................................................................................................
104
Scanner subsystem
.........................................................................................................
105
Mechanical structure
.......................................................................................
105
Motors and fans
..............................................................................................
106
Basic block diagram
........................................................................................
107
Basic system configuration
.............................................................................
108
Scanner unit systems
.....................................................................
108
Scan mode
.....................................................................................
109
Power supply assembly
..................................................................
109
Sleep mode
....................................................................................
110
Low-voltage power supply circuit
....................................................
111
Protective functions
........................................................................
112
Scanner controller circuit
................................................................
113
Flatbed operation
............................................................................................
115
Flatbed document exposure control
...............................................
115
Flatbed optical drive control
............................................................
115
Flatbed optical unit operation
.........................................................
116
Flatbed document size detection
....................................................
117
ADF operation
.................................................................................................
119
ADF document exposure control
....................................................
119
ADF document feed control
............................................................
120
ADF document size detection
.........................................................
122
ADF feeder sensors
........................................................................
123
ADF document skew detection
.......................................................
123
Scanned data flow
...........................................................................................
124
Copy processor
...............................................................................................
125
Scanning process control signals
...................................................
126
Typical scanning process flow
........................................................
127
Engine control system
......................................................................................................................
128
DC controller PCA
...........................................................................................................
129
High-voltage power supply circuit
....................................................................................
130
Low-voltage power supply
...............................................................................................
132
Fuser control circuit
.........................................................................................................
132
Formatter system
.............................................................................................................................
134
Formatter hardware
.........................................................................................................
134
Laser/scanner system
......................................................................................................................
135
Image formation system
...................................................................................................................
136
vi
ENWW