Brother HL-4000CN Service Manual page 78

5.5.1 Major functions ............................................................................................................ III-30
5.5.2 Reference diagram...................................................................................................... III-31
5.6 Chute ASSY Exit ................................................................................................................ III-32
5.6.1 Major functions ............................................................................................................ III-32
5.6.2 Reference diagram...................................................................................................... III-32
5.7 Transfer Roll Cartridge ASSY & Fuser .............................................................................. III-33
5.7.1 Major functions ............................................................................................................ III-33
5.7.2 Reference diagram...................................................................................................... III-34
5.8 Xerographics...................................................................................................................... III-35
5.8.1 Major functions ............................................................................................................ III-35
5.8.2 Reference diagram...................................................................................................... III-36
5.9 Toner Cartridge ASSY ....................................................................................................... III-37
5.9.1 Major functions ............................................................................................................ III-37
5.9.2 Reference diagram...................................................................................................... III-38
5.10 Frame & Drive.................................................................................................................. III-39
5.10.1 Major functions .......................................................................................................... III-39
5.10.2 Reference diagram.................................................................................................... III-39
5.11 Electrical........................................................................................................................... III-40
5.11.1 Major functions .......................................................................................................... III-40
5.11.2 Reference diagram.................................................................................................... III-41
6. MODES........................................................................................................ III-42
6.1 Print Mode.......................................................................................................................... III-42
6.2 Operation Modes ............................................................................................................... III-42
7. CONTROL ................................................................................................... III-43
7.1 Control of Paper Size ......................................................................................................... III-43
7.2 Selective Control on Paper Pick-up Unit............................................................................ III-43
7.3 Scanner Light Quantity Control .......................................................................................... III-43
7.4 Process Control ................................................................................................................. III-43
7.4.1 Potential control........................................................................................................... III-44
7.4.2 Toner density control................................................................................................... III-45
7.4.3 High area coverage mode ........................................................................................... III-46
7.4.4 Admix mode ................................................................................................................ III-46
7.4.5 LED light quantity control of holder ASSY CTD........................................................... III-46
7.5 Color Registration Control.................................................................................................. III-47
7.6 Transfer Roll Cartridge Unit ASSY Control ........................................................................ III-48
7.6.1 Detecting the installation of transfer roll cartridge unit ASSY...................................... III-48
7.6.2 Detecting the life of transfer roll cartridge unit ASSY .................................................. III-48
7.7 Toner Control ..................................................................................................................... III-49
7.7.1 Sensor toner low ......................................................................................................... III-49
7.7.2 2 Toner presence control ............................................................................................ III-49
7.8 Fuser Control ..................................................................................................................... III-50
7.8.1 Fuser temperature control........................................................................................... III-50
7.8.2 Cool down ................................................................................................................... III-50