Brother International HL-720 Service Manual - Page 4

Contents, I Features And Specifications, Ii Theory Of Operation - reset

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CONTENTS CHAPTER I FEATURES AND SPECIFICATIONS I-1 1. SYSTEM REQUIREMENTS I-1 2. FEATURES ...I-1 3. SPECIFICATIONS ...I-4 3.1 Printing...I-4 3.2 Functions ...I-5 3.3 Electrical and Mechanical ...I-6 3.4 Paper Specification ...I-7 3.5 Print Delivery...I-7 3.6 Paper ...I-7 3.7 Effective Printing Area ...I-8 4. SAFETY INFORMATION I-10 4.1 Laser Safety (110 - 120V Model only I-10 4.2 CDRH Regulations (110 -120V Model only I-10 4.3 Caution for Laser Product...I-11 CHAPTER II THEORY OF OPERATION II-1 1. ELECTRONICS...II-1 1.1 General Block Diagram...II-1 1.2 Main PCB Block Diagram ...II-3 1.3 Main PCB...II-5 1.3.1 CPU Core ...II-5 1.3.2 ASIC ...II-7 1.3.3 ROM ...II-13 1.3.4 DRAM...II-13 1.3.5 Optional RAM ...II-15 1.3.6 Optional Serial I/O ...II-16 1.3.7 EEPROM ...II-16 1.3.8 Reset Circuit...II-17 1.3.9 CDCC I/O ...II-18 1.3.10 Engine I/O ...II-19 1.3.11 Paper Feed Motor Drive Circuit II-21 1.4 Panel Sensor PCB ...II-22 1.5 Power Supply...II-23 2. MECHANICS...II-24 2.1 Overview of printing mechanism II-24 2.2 Paper Transfer ...II-25 2.2.1 Paper Supply...II-25 2.2.2 Paper Registration...II-25 2.2.3 Paper Eject...II-26 2.3 Sensors...II-27 2.3.1 Cover Sensor ...II-27 2.3.2 Toner Empty Sensor ...II-27 2.4 Drum Unit...II-28 2.4.1 Photosensitive Drum ...II-28 2.4.2 Primary Charger ...II-28 2.4.3 Developer Roller...II-28 2.4.4 Transfer Roller...II-28 2.4.5 Cleaner Roller ...II-28 i

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i
CONTENTS
CHAPTER I FEATURES AND SPECIFICATIONS
.......................................................
I-1
1.
SYSTEM REQUIREMENTS
................................ ................................ ................................
I-1
2. FEATURES
................................ ................................ ................................ .......................
I-1
3. SPECIFICATIONS
................................ ................................ ................................ ..............
I-4
3.1
Printing
.......................................................................................................................................
I-4
3.2
Functions
...................................................................................................................................
I-5
3.3
Electrical and Mechanical
..........................................................................................................
I-6
3.4
Paper Specification
....................................................................................................................
I-7
3.5
Print Delivery
..............................................................................................................................
I-7
3.6
Paper
.........................................................................................................................................
I-7
3.7
Effective Printing Area
...............................................................................................................
I-8
4.
SAFETY INFORMATION
................................ ................................ ................................ ..
I-10
4.1
Laser Safety (110 - 120V Model only))
....................................................................................
I-10
4.2
CDRH Regulations (110 -120V Model only)
............................................................................
I-10
4.3
Caution for Laser Product
........................................................................................................
I-11
CHAPTER II THEORY OF OPERATION
....................................................................
II-1
1. ELECTRONICS
................................ ................................ ................................ ..................
II-1
1.1
General Block Diagram
.............................................................................................................
II-1
1.2
Main PCB Block Diagram
.........................................................................................................
II-3
1.3
Main PCB
..................................................................................................................................
II-5
1.3.1
CPU Core
.................................................................................................................................
II-5
1.3.2
ASIC
.........................................................................................................................................
II-7
1.3.3
ROM
.......................................................................................................................................
II-13
1.3.4
DRAM
.....................................................................................................................................
II-13
1.3.5
Optional RAM
.........................................................................................................................
II-15
1.3.6
Optional Serial
I/O
.................................................................................................................
II-16
1.3.7
EEPROM
................................................................................................................................
II-16
1.3.8
Reset Circuit
...........................................................................................................................
II-17
1.3.9
CDCC I/O
...............................................................................................................................
II-18
1.3.10 Engine I/O
..............................................................................................................................
II-19
1.3.11 Paper Feed Motor Drive Circuit
..............................................................................................
II-21
1.4
Panel Sensor PCB
..................................................................................................................
II-22
1.5
Power Supply
..........................................................................................................................
II-23
2. MECHANICS
................................ ................................ ................................ ....................
II-24
2.1
Overview
of printing mechanism
............................................................................................
II-24
2.2
Paper Transfer
........................................................................................................................
II-25
2.2.1
Paper Supply
..........................................................................................................................
II-25
2.2.2
Paper Registration
..................................................................................................................
II-25
2.2.3
Paper Eject
.............................................................................................................................
II-26
2.3
Sensors
...................................................................................................................................
II-27
2.3.1
Cover Sensor
.........................................................................................................................
II-27
2.3.2
Toner Empty Sensor
..............................................................................................................
II-27
2.4
Drum Unit
................................................................................................................................
II-28
2.4.1
Photosensitive Drum
..............................................................................................................
II-28
2.4.2
Primary Charger
.....................................................................................................................
II-28
2.4.3
Developer Roller
.....................................................................................................................
II-28
2.4.4
Transfer Roller
........................................................................................................................
II-28
2.4.5
Cleaner Roller
........................................................................................................................
II-28