Brother DCP-8045DN Service-Handbuch - Seite 4

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CHAPTER 3 THEORY OF OPERATION................................................. 3-1

1. E LECTRONICS ...................................................................................................... 3-1

1.1

1.2

1.3 Main

1.4 Engine

1.5 Pow er Supply.................................................................................................................. 3-11

2. M ECHANICS ........................................................................................................ 3-13

2.1

2.2 Sc anner Mechanism....................................................................................................... 3-14

2.3 Paper

2.4 Sens ors .......................................................................................................................... 3-17

fineline6

3.2.2 For Parallel Interface Cable Users

(For Windows

95/98/98SE/Me/2000 Professional/XP) ...................................................2-13

3.2.3 For Windows NT

Workstation Version 4.0 Users ............................................................2-18

3.2.4 For Network Interface Cable Users

(For Windows

95/98/98SE/Me/NT/2000 Professional/XP) ..............................................2-20

3.2.5 For USB Interface Cable Users (For Mac

3.2.6 For USB Interface Cable Users (For Mac

3.2.7 For Network Interface Cable Users (For Mac

3.2.8 For Network Interface Cable Users (For Mac

General Block Diagram .................................................................................................... 3-1

Main PCB Block Diagram ................................................................................................. 3-2

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 RO M ....................................................................................................................................3-4

1.3.5 Flash ROM ..........................................................................................................................3-5

1.3.6 SDRAM ...............................................................................................................................3-5

1.3.7 O ptional RAM ......................................................................................................................3-6

1.3.8 EEPRO M.............................................................................................................................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

PCB .................................................................................................................... 3-10

1.5.1 Low-voltage power supply.................................................................................................3-11

1.5.2 High-voltage power supply ................................................................................................3-12

Overview of Printing Mechanism .................................................................................... 3-13

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

2.4.1 Cov er sensors ...................................................................................................................3-17

2.4.2 T oner sensors ...................................................................................................................3-17

2.4.3 Cassette sensor / Paper empty sensor .............................................................................3-18

2.4.4 Paper eject sensor ............................................................................................................3-18

2.4.5 M P-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

MFC-8440/8840D/8840DN, DCP-8040/8045D/8045DN

OS 8.6 to 9.2 Users) ......................................2-23

OS X 10.1/10.2.1 or greater Users) ...............2-24

OS 8.6 to 9.2 Users) ................................2-25

OS X 10.1/10.2.1 or greater Users) .........2-26

iii

SERVICE MANUAL