Brother mfc8440 Service Manual page 5
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Also See for mfc8440:
- User manual (426 pages) ,
- Software user's manual (183 pages) ,
- Quick setup manual (52 pages)
Table of Contents
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(For Windows
CHAPTER 3 THEORY OF OPERATION................................................. 3-1
1.
ELECTRONICS ...................................................................................................... 3-1
1.1
General Block Diagram .................................................................................................... 3-1
1.2
Main PCB Block Diagram ................................................................................................. 3-2
1.3
Main PCB ......................................................................................................................... 3-3
1.3.1 CPU.....................................................................................................................................3-3
1.3.2 USB .....................................................................................................................................3-3
1.3.3 IEEE 1284 ...........................................................................................................................3-4
1.3.4 ROM ....................................................................................................................................3-4
1.3.5 Flash ROM ..........................................................................................................................3-5
1.3.6 SDRAM ...............................................................................................................................3-5
1.3.7 Optional RAM ......................................................................................................................3-6
1.3.8 EEPROM.............................................................................................................................3-7
1.3.9 Reset circuit ........................................................................................................................3-7
1.3.10 Engine I/O ...........................................................................................................................3-7
1.3.11 Panel I/O .............................................................................................................................3-7
1.3.12 Video I/O .............................................................................................................................3-8
1.3.13 Scanner control ...................................................................................................................3-8
1.3.14 Power supply.......................................................................................................................3-9
1.4
Engine PCB .................................................................................................................... 3-10
1.5
Power Supply.................................................................................................................. 3-11
1.5.1 Low-voltage power supply.................................................................................................3-11
1.5.2 High-voltage power supply ................................................................................................3-12
2.
MECHANICS ........................................................................................................ 3-13
2.1
Overview of Printing Mechanism .................................................................................... 3-13
2.2
Scanner Mechanism....................................................................................................... 3-14
2.3
Paper Transfer ............................................................................................................... 3-15
2.3.1 Paper supply .....................................................................................................................3-15
2.3.2 Paper registration..............................................................................................................3-15
2.3.3 Paper eject ........................................................................................................................3-16
2.3.4 Duplex printing ..................................................................................................................3-16
2.4
Sensors .......................................................................................................................... 3-17
2.4.1 Cover sensors ...................................................................................................................3-17
2.4.2 Toner sensors ...................................................................................................................3-17
2.4.3 Cassette sensor / Paper empty sensor .............................................................................3-18
2.4.4 Paper eject sensor ............................................................................................................3-18
2.4.5 MP-PE sensor ...................................................................................................................3-19
2.4.6 Document cover sensor ....................................................................................................3-19
2.4.7 Document front sensor / Document rear sensor ...............................................................3-20
2.4.8 DX-sensor PCB ASSY.......................................................................................................3-20
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95/98/98SE/Me/2000 Professional/XP) ...................................................2-13
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Workstation Version 4.0 Users ............................................................2-18
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95/98/98SE/Me/NT/2000 Professional/XP) ..............................................2-20
iii
MFC-8440/8840D/8840DN, DCP-8040/8045D/8045DN
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OS 8.6 to 9.2 Users) ......................................2-23
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OS X 10.1/10.2.1 or greater Users) ...............2-24
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OS 8.6 to 9.2 Users) ................................2-25
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OS X 10.1/10.2.1 or greater Users) .........2-26
SERVICE MANUAL
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