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FACSIMILE EQUIPMENT
SERVICE MANUAL
MODELS:
MFC3820CN/MFC3420C

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   Summary of Contents for Brother mfc-3420c

  • Page 1

    FACSIMILE EQUIPMENT SERVICE MANUAL MODELS: MFC3820CN/MFC3420C...

  • Page 2

    Preface This Service Manual is intended for use by service personnel and details the specifications, construction, theory of operation, and maintenance for the Brother facsimile equipment noted on the front cover. It includes information required for troubleshooting and service--disassembly, reassembly, and lubrication--so that service personnel will be able to understand equipment function, repair the equipment in a timely manner and order spare parts as necessary.

  • Page 3

    CHAPTER 7 MAINTENANCE MODE Describes the maintenance mode which is exclusively designed for the purpose of checks, settings and adjustments using the keys on the control panel. In the maintenance mode, you can update memory (EEPROM: electrically erasable programmable read-only memory) contents for optimizing the drive conditions of the print head unit, paper feed roller or paper ejection roller (if they have been replaced) or for setting the CIS scanner area, for example.

  • Page 4

    CHAPTER 3 THEORY OF OPERATION This chapter summarizes the scanner and printing mechanisms and control electronics. It also provides information about sensors and their actuators. This chapter helps you to understand the operating principles and isolate the source of a problem (troubleshooting). CONTENTS OVERVIEW .........................3-1 MECHANISMS ......................3-2...

  • Page 5

    CHAPTER 4 DISASSEMBLY/REASSEMBLY AND LUBRICATION This chapter details procedures for disassembling and reassembling the machine together with related notes. The disassembly order flow provided enables you to see at a glance the quickest way to get to component(s) involved. At the start of a disassembly job, you check a disassembly order flow that guides you through a shortcut to the object components.

  • Page 6

    4.1.18 Platen ......................4-60 4.1.19 Paper Pressure Holder, Sensor Actuators and Carriage Motor......4-61 4.1.20 Paper Ejection Roller ..................4-62 4.1.21 Paper Feed Roller and Purge-Related Parts (Purge Lever, Purge Shaft, and ASF-Purge Switching Gear 23)..............4-63 4.1.22 Main Chassis, Paper Feed Motor, and Speaker..........4-65 4.1.23 Ink Absorber Box....................4-67 HARNESS ROUTING ....................4-68 LUBRICATION ......................4-73...

  • Page 7

    4.1 DISASSEMBLY/REASSEMBLY Safety Precautions To prevent the creation of secondary problems by mishandling, observe the following precautions during maintenance work. (1) If you unpack the package sent from the user, first check that the top edge of the head wiper is Head cap unit flush with that of the head cap unit before turning on the machine.

  • Page 8

    CHAPTER 8 ERROR INDICATION AND TROUBLESHOOTING This chapter details error messages and codes that the incorporated self-diagnostic functions display if any error or malfunction occurs. If any error message appears, refer to this chapter to find which components should be checked or replaced. The latter half of this chapter provides sample problems that could occur in the main sections of the machine and related troubleshooting procedures.

  • Page 9

    [ 3 ] Carriage drive and purge mechanisms ...........8-34 [ 4 ] Print head mechanism................8-36 [ 5 ] ASF mechanism..................8-36 [ 6 ] Paper feeding mechanism..............8-37 [ 7 ] Speaker....................8-37 [ 8 ] Control panel..................8-37 [ 9 ] PCBs......................8-38 [ 10 ] Adjustments/data setting into the memories ...........8-39...

  • Page 10

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This manual also for:

Mfc-3820cn

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