Table Of Contents - Brother HL-730Plus Service Manual

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
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