Table of contents
1
Theory of operation
Basic operation
.....................................................................................................................................
2
Major product systems
.........................................................................................................
2
Product block diagram
.........................................................................................................
2
Sequence of operation
.........................................................................................................
3
Normal sequence of operation
............................................................................
3
Formatter-control system
.....................................................................................................................
5
Sleep mode
..........................................................................................................................
5
Input/output
..........................................................................................................................
5
CPU
.....................................................................................................................................
6
Memory
................................................................................................................................
6
Firmware
.............................................................................................................
6
Nonvolatile memory
............................................................................................
6
PJL overview
.......................................................................................................................
6
PML
.....................................................................................................................................
6
Control panel
.......................................................................................................................
6
Engine-control system
..........................................................................................................................
7
DC controller
........................................................................................................................
8
Motors
...............................................................................................................
11
Fans
..................................................................................................................
13
Fuser-control circuit
...........................................................................................
14
Fuser temperature control
................................................................
15
Fuser protective function
..................................................................
16
Fuser failure detection
......................................................................
17
Low-voltage power supply
.................................................................................
18
Overcurrent/overvoltage protection
..................................................
20
High-voltage power supply
................................................................................
21
Laser scanner system
........................................................................................................
23
Laser failure detection
.......................................................................................
24
Image-formation system
.....................................................................................................................
25
Electrophotographic process
.............................................................................................
25
Image formation process
...................................................................................................
27
Latent-image formation block
............................................................................
28
Pre-exposure
....................................................................................
28
ENWW
iii