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TABLE OF CONTENTS
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4.2 Load Paper Manually......................................................................................................2-10
4.3 Two Side Printing (Manual Duplexing)............................................................................2-11
4.3.1 To print on both sides of the paper from the paper cassette ............................................ 2-11
4.3.2 To print on both sides of the paper from the manual feed slot.......................................... 2-12
5. CONTROL PANEL OPERATION................................ ................................ ...........2-13
5.1 Ready (Paper) LED Indications ......................................................................................2-13
5.2 Data (Toner) LED Indications .........................................................................................2-14
5.3 Drum LED Indications.....................................................................................................2-14
5.4 Alarm LED Indications ....................................................................................................2-14
5.5 Control Panel Button Operations ....................................................................................2-15
5.6 Other Control Features ...................................................................................................2-15
5.6.1 Sleep mode....................................................................................................................... 2-15
5.6.2 Test print mode................................................................................................................. 2-16
6. NETWORK BOARD OPERATION (FOR HL-1270N ONLY) ..................................2-17
6.1 Preparing the BR-net Board............................................................................................2-17
6.1.1 Connect the Ethernet cable .............................................................................................. 2-17
6.1.2 Install the BRAdmin32: configuration utility (for Windows 95/98/NT 4.0 users only) ........ 2-17
6.1.3 Print configuration page....................................................................................................2-18
6.2 Functions ........................................................................................................................2-18
6.2.1 LED functions.................................................................................................................... 2-18
6.2.2 Factory default setting....................................................................................................... 2-18
CHAPTER 3 THEORY OF OPERATION.................................................3-1
1. ELECTRONICS .......................................................................................................3-1
1.1 General Block Diagram.....................................................................................................3-1
1.2 Main PCB Block Diagram .................................................................................................3-4
1.3 Main PCB..........................................................................................................................3-7
1.3.1 ASIC....................................................................................................................................3-7
1.3.2 ROM..................................................................................................................................3-10
1.3.3 Flash ROM........................................................................................................................ 3-12
1.3.4 DRAM................................................................................................................................ 3-12
1.3.5 Optional RAM.................................................................................................................... 3-14
1.3.6 Optional serial I/O ............................................................................................................. 3-15
1.3.7 PCI bus ............................................................................................................................. 3-15
1.3.8 EEPROM........................................................................................................................... 3-16
1.3.9 Reset circuit ...................................................................................................................... 3-16
1.3.10 Engine I/O......................................................................................................................... 3-17
1.4 Engine PCB ....................................................................................................................3-18
1.5 BR-net PCB (for HL-1270 only) ......................................................................................3-18
1.6 Power Supply..................................................................................................................3-19
1.6.1 Low-voltage Power Supply ............................................................................................... 3-19
1.6.2 High-voltage Power Supply............................................................................................... 3-20
2. MECHANICS ................................ ................................ ................................ .........3-21
2.1 Overview of Printing Mechanism ....................................................................................3-21
2.2 Paper Transfer................................................................................................................3-23
2.2.1 Paper supply..................................................................................................................... 3-23
2.2.2 Paper registration.............................................................................................................. 3-23