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SERVICE MANUAL

MODEL: MFC8440/8840D/8840DN
DCP8040/8045D/8045DN
Read this manual thoroughly before maintenance work.
Keep this manual in a convenient place for quick and easy reference at all times.
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   Summary of Contents for Brother MFC8440

  • Page 1: Service Manual

    SERVICE MANUAL MODEL: MFC8440/8840D/8840DN DCP8040/8045D/8045DN Read this manual thoroughly before maintenance work. Keep this manual in a convenient place for quick and easy reference at all times. fineline6...
  • Page 2 PREFACE This publication is a Service Manual covering the specifications, construction, theory of operation, and maintenance of the Brother machine. It includes information required for field troubleshooting and repair--disassembly, reassembly, and lubrication--so that service personnel will be able to understand machine function, to rapidly repair the machine and order any necessary spare parts.
  • Page 3 TABLE OF CONTENTS TABLE OF CONTENTS REGULATION .................... viii SAFETY INFORMATION ................x CHAPTER 1 GENERAL................1-1 1. OV ERVIEW ......................1-1 2. SPEC IFICATIONS ....................1-3 2.1 G eneral..........................1-3 2.2 G eneral (Continued) ......................1-3 2.3 Print Media ........................1-4 2.4 Copy ..........................
  • Page 4: Chapter 3 Theory Of Operation

    MFC-8440/8840D/8840DN, DCP-8040/8045D/8045DN SERVICE MANUAL 3.2.2 For Parallel Interface Cable Users ® (For Windows 95/98/98SE/Me/2000 Professional/XP) ...........2-13 ® 3.2.3 For Windows NT Workstation Version 4.0 Users ............2-18 3.2.4 For Network Interface Cable Users ® (For Windows 95/98/98SE/Me/NT/2000 Professional/XP) ..........2-20 ® 3.2.5 For USB Interface Cable Users (For Mac OS 8.6 to 9.2 Users) ........2-23 ®...
  • Page 5 TABLE OF CONTENTS 2.4.9 Rear cover sensor ......................3-21 2.4.10 HP sensor .........................3-21 2.5 Drum Unit ........................3-22 2.5.1 Photosensitiv e drum......................3-22 2.5.2 Primary charger.........................3-22 2.5.3 T ransfer roller ........................3-22 2.5.4 C leaner..........................3-22 2.6 T oner Cartridge ......................3-22 2.7 Print Process ........................
  • Page 6: Chapter 5 Periodic Maintenance

    MFC-8440/8840D/8840DN, DCP-8040/8045D/8045DN SERVICE MANUAL 3.28 Paper Feeder........................4-71 3.29 Frame L / Drive Unit ....................... 7-78 3.30 Reversing Release Solenoid (MFC-8840D/8840DN, DCP-8045D/8045DN only)..4-82 3.31 T hermistor ASSY......................4-83 3.32 Fan Motor 60 Unit LV / Fan Motor 60 Unit..............4-83 3.33 Fram e R..........................
  • Page 7 95/98/Me Peer to Peer (HP JetAdmin Compatible Method) Troubleshooting ..6-59 ® 10.8 W indows 95/98/Me/NT 4.0/2000 Peer to Peer Print (NetBIOS) Troubleshooting ..6-60 10.9 Brother Internet Print (TCP/IP) Troubleshooting ............6-60 ® 10.10 Windows 95/98/Me/2000/XP IPP Troubleshooting............6-60 10.11 Novell Netware Troubleshooting ..................
  • Page 8 MFC-8440/8840D/8840DN, DCP-8040/8045D/8045DN SERVICE MANUAL 3.11 Fine Adjustment of Scan Start/End Positions (Maintenance mode 54)......7-18 3.12 CCD Scanner Area Setting (Maintenance mode 55) ............. 7-20 3.13 EEPROM Customizing (Maintenance mode 74) ............7-21 3.14 Printing out of Machine Log Information (Maintenance mode 77)........7-22 3.15 Display of the Equipment’s Log Information (Maintenance mode 80)......
  • Page 9 MFC-8440/8840D/8840DN, DCP-8040/8045D/8045DN SERVICE MANUAL CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY SAFETY PRECAUTIONS To avoid creating secondary problems by mishandling, follow the warnings and precautions below during maintenance work. WARNING (1) Always turn off the power switch and unplug the power cord from the power outlet before accessing any parts inside the printer.
  • Page 10 440/8840D/8840DN, DCP-8040/8045D/8045DN SERVICE MANUAL CHAPTER 6 TROUBLESHOOTING INTRODUCTION Initial Check (1) O perating environment Chec k if: • The source voltage stays within ±10% from the rated voltage shown on the rating plate. • The machine is installed on a solid, level surface. •...
  • Page 11 CHAPTER 6 TROUBLESHOOTING (4) Oth ers Condensation: When the machine is moved from a cold room into a warm room in cold weather, condensation may occur inside the machine, causing various problems as listed below: • Condensation on the optical surfaces such as the scanning mirror, lenses, the reflection mirror and the protection glass may cause the print image to be light.
  • Page 12 Brother DCP-8040 8045D 8045DN MFC-8440 8840D 8840DN service manual Brother DCP-8040 8045D 8045DN MFC-8440 8840D 8840DN service manual Brother DCP-8040 8045D 8045DN MFC-8440 8840D 8840DN service manual Brother DCP-8040 8045D 8045DN MFC-8440 8840D 8840DN service manual Brother DCP-8040 8045D 8045DN MFC-8440 8840D 8840DN service manual...

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