Chapter 3 Theory Of Operation - Brother HL-2030 Service Manual

4.3 Printing on Thick Paper, Card Stock, Labels, and Envelopes from the Manual Feed Slot
........................................................................................................................................ 2-15
4.4 Duplex Printing ............................................................................................................... 2-17
4.5 Paper Orientation for Manual Duplex Printing ................................................................ 2-20
5. CONTROL PANEL OPERATION.......................................................................... 2-21
5.1 Control Panel Button & LED Functions (Printer Status) ................................................. 2-21
5.1.1 Control panel button..........................................................................................................2-21
5.1.2 LEDs .................................................................................................................................2-21
5.2 LED Indications .............................................................................................................. 2-22
5.3 Service Call Indications .................................................................................................. 2-24
5.4 Control Panel Button (Go button) ................................................................................... 2-25
5.5 Other Control Features................................................................................................... 2-25
5.5.1 Print a test page ................................................................................................................2-25
5.5.2 Print a printer settings page ..............................................................................................2-26
5.5.3 Print fonts (For HL-2070N) ................................................................................................2-26
6. NETWORK FUNCTIONS (FOR HL-2070N).......................................................... 2-27
6.1 LED Functions ................................................................................................................ 2-27
6.2 Network Factory Default Setting (For HL-2070N)........................................................... 2-27
6.3 Network Factory Default Setting with APIPA Protocol Disabled (For HL-2070N) .......... 2-28
7. OPTIONAL PRINT SERVER................................................................................. 2-29

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 interface ......................................................................................................................3-5
1.3.3 IEEE 1284 interface ............................................................................................................3-6
1.3.4 Network interface ................................................................................................................3-8
1.3.5 ROM ....................................................................................................................................3-9
1.3.6 SDRAM .............................................................................................................................3-11
1.3.7 EEPROM...........................................................................................................................3-13
1.3.8 Reset circuit ......................................................................................................................3-13
1.3.9 Panel I/O ...........................................................................................................................3-14
1.3.10 Video I/O ...........................................................................................................................3-15
1.3.11 Power supply.....................................................................................................................3-16
1.4 Power Supply.................................................................................................................. 3-17
1.4.1 Low-voltage power supply.................................................................................................3-17
1.4.2 High-voltage power supply ................................................................................................3-18
2. MECHANICS ........................................................................................................ 3-19
2.1 Overview of Printing Mechanism .................................................................................... 3-19
2.2 Paper Transfer ............................................................................................................... 3-20
2.2.1 Paper supply .....................................................................................................................3-20
2.2.2 Push-up function of paper tray ..........................................................................................3-22
2.2.3 Paper registration..............................................................................................................3-24
2.2.4 Paper eject ........................................................................................................................3-25
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HL-2030/2040/2070N SERVICE MANUAL
Confidential