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TABLE OF CONTENTS
iii
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
CHAPTER 3 THEORY OF OPERATION .................................................3-1
1.
ELECTRONICS ................................ ................................ ................................ .......3-1
1.1
General Block Diagram.....................................................................................................3-1
1.2
Main PCB Block Diagram .................................................................................................3-3
1.3
Main PCB..........................................................................................................................3-5
1.3.1 ASIC.................................................................................................................................... 3-5
1.3.2 ROM.................................................................................................................................... 3-8
1.3.3 DRAM.................................................................................................................................. 3-9
1.3.4 Optional RAM.................................................................................................................... 3-11
1.3.5 Optional serial I/O ............................................................................................................. 3-12
1.3.6 EEPROM........................................................................................................................... 3-12
1.3.7 Reset circuit ...................................................................................................................... 3-13
1.3.8 Engine I/O ......................................................................................................................... 3-14
1.4
Engine PCB ....................................................................................................................3-14
1.5
Power Supply..................................................................................................................3-15
1.5.1 Low-voltage Power Supply ............................................................................................... 3-15
1.5.2 High-voltage Power Supply............................................................................................... 3-16
2.
MECHANICS ................................ ................................ ................................ .........3-17
2.1
Overview of Printing Mechanism ....................................................................................3-17
2.2
Paper Transfer ................................................................................................................3-19
2.2.1 Paper supply ..................................................................................................................... 3-19
2.2.2 Paper registration.............................................................................................................. 3-19
2.2.3 Paper eject........................................................................................................................ 3-20
2.3
Sensors...........................................................................................................................3-20
2.3.1 Cover sensors A and B ..................................................................................................... 3-20
2.3.2 Toner sensor..................................................................................................................... 3-21
2.4
Drum Unit........................................................................................................................3-21
2.4.1 Photosensitive drum ......................................................................................................... 3-21
2.4.2 Primary charger ................................................................................................................ 3-21
2.4.3 Transfer roller.................................................................................................................... 3-21
2.4.5 Cleaner ............................................................................................................................. 3-21
2.5
Toner Cartridge...............................................................................................................3-21
2.6
Print Process...................................................................................................................3-22
2.6.1 Charging ........................................................................................................................... 3-22
Содержание HL-1240
Страница 1: ......
Страница 45: ...CHAPTER 3 THEORY OF OPERATION 3 7 Fig 3 6 ...
Страница 47: ...CHAPTER 3 THEORY OF OPERATION 3 9 1 3 3 DRAM A 16M bit DRAM x 16 bits is used as the RAM Fig 3 9 HL 1240 ...
Страница 48: ...CHAPTER 3 THEORY OF OPERATION 3 10 Two 16M bit DRAMs x 16 bits are used as the RAM Fig 3 10 HL 1250 ...
Страница 102: ...CHAPTER 4 DISASSEMBLY AND RE ASSEMBLY 4 38 ...
Страница 110: ...CHAPTER 5 PERIODIC MAINTENANCE 5 8 ...
Страница 176: ...CODE UK4352000 B512040CIR 1 2 A 18 NAME Appendix 10 Main PCB Circuit Diagram HL 1240 1 2 ...
Страница 177: ...Appendix 11 Main PCB Circuit Diagram HL 1240 2 2 CODE UK4352000 B512040CIR 2 2 A 19 NAME ...
Страница 178: ...Appendix 12 Main PCB Circuit Diagram HL 1250 1 5 CODE UK4361000 B512049CIR 1 5 A 20 NAME ...
Страница 179: ...Appendix 13 Main PCB Circuit Diagram HL 1250 2 5 CODE UK4361000 B512049CIR 2 5 A 21 NAME ...
Страница 180: ...CODE UK4361000 B512049CIR A 22 NAME Appendix 14 Main PCB Circuit Diagram HL 1250 3 5 ...
Страница 181: ...CODE UK4361000 B512049CIR 4 5 A 23 NAME Appendix 15 Main PCB Circuit Diagram HL 1250 4 5 ...
Страница 182: ...CODE UK4361000 B512049CIR 5 5 A 24 NAME Appendix 16 Main PCB Circuit Diagram HL 1250 5 5 ...
Страница 183: ...Appendix 17 Engine PCB Circuit Diagram CODE UK4444000 B512059CIR A 25 NAME ...
Страница 192: ...INDEX vi ...
Страница 203: ...6 COVER MODEL HL 1240 HL 1250 84U Z01 Z02 060 8 7 15 1 12 12 12 9 11 11 8 6 2 5 10 16 13 17 4 3 3 2 12 14 ...
Страница 210: ... 15 14 ADJUSTING TOOL PRT 402 TOOL NO TOOL NAME REMARK PRT 402 TORX SCREW DRIVER MODEL HL 1240 HL 1250 84U Z01 Z02 ...
Страница 237: ...CHAPTER 1 ABOUT THIS PRINTER 1 19 1 Select manual feed mode in the printer driver Windows 95 98 and Windows 3 1 ...
Страница 321: ...A 12 HP LaserJet IIP HP LaserJet 6P HL 1250 only ...
Страница 323: ...A 14 HP LaserJet IIP 6P EPSON FX 850 IBM Proprinter XL EPSON FX 850 ...