Brother HL-4000CN Service Manual page 77

CHAPTER III STRUCTURE OF SYSTEM COMPONENTS............III-1
1. PRINTING PROCESS ................................................................................... III-1
1.1 Summary of Printing Process .............................................................................................. III-1
1.2 Schematic Diagram for Printing Processes ......................................................................... III-3
1.3 Description of Printing Process Techniques ........................................................................ III-4
1.3.1 Charging with electricity................................................................................................. III-4
1.3.2 Exposure ....................................................................................................................... III-5
1.3.3 Development ................................................................................................................. III-7
1.3.4 Primary transfer (drum -> IDT 1)................................................................................... III-9
1.3.5 Secondary transfer (IDT 1 -> IDT 2)............................................................................ III-11
1.3.6 Cleaning (IDT 1) .......................................................................................................... III-11
1.3.7 Tertiary transfer (IDT 2 - paper) .................................................................................. III-12
1.3.8 Cleaning (IDT 2) .......................................................................................................... III-13
1.3.9 Static elimination ......................................................................................................... III-13
1.3.10 Fixing......................................................................................................................... III-14
1.3.11 Cleaning (general)..................................................................................................... III-15
2. FLOW OF PRINT DATA............................................................................... III-17
2.1 Data Flow ........................................................................................................................... III-17
3. DRIVE TRANSMISSION ROUTE................................................................. III-18
3.1 Main Drive ASSY ............................................................................................................... III-18
3.2 DEVE Drive ASSY ............................................................................................................. III-19
3.3 Holder Toner Cartridge ASSY (Y, M, C, K) ........................................................................ III-19
3.4 Fuser Drive ASSY .............................................................................................................. III-20
3.5 Motor ASSY DUP............................................................................................................... III-20
3.6 Gear Layout ....................................................................................................................... III-21
4. PAPER TRANSFER..................................................................................... III-22
4.1 Paper Transfer Route (without option)............................................................................... III-22
4.2 Layout of Paper Transfer Route......................................................................................... III-23
5. FUNCTIONS OF MAJOR FUNCTIONAL COMPONENTS ........................... III-24
5.1 Paper Cassette .................................................................................................................. III-25
5.1.1 Major functions ............................................................................................................ III-25
5.1.2 Reference diagram...................................................................................................... III-25
5.2 Paper Feeder ..................................................................................................................... III-26
5.2.1 Major functions ............................................................................................................ III-26
5.2.2 Reference diagram...................................................................................................... III-27
5.3 Housing ASSY Retard........................................................................................................ III-28
5.3.1 Major functions ............................................................................................................ III-28
5.3.2 Reference diagram...................................................................................................... III-28
5.4 Front ASSY In .................................................................................................................... III-29
5.4.1 Major functions ............................................................................................................ III-29
5.4.2 Reference diagram...................................................................................................... III-29
5.5 Chute ASSY Out ................................................................................................................ III-30
CONTENTS