Chapter 5 disassembly/reassembly and lubrication – Brother Facsimile Equipment MFC7420 User Manual

Page 70

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Confidential

CHAPTER 5 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 the disassembly order flow that guides you through
a shortcut to the object components.

This chapter also covers screw tightening torques and lubrication points to which the specified
lubricants should be applied during reassembly jobs.

CONTENTS

5.1 DISASSEMBLY/REASSEMBLY .....................................................................................5-1

Safety Precautions........................................................................................................5-1

Tightening Torque.........................................................................................................5-2

Preparation ...................................................................................................................5-3

How to Access the Object Component .........................................................................5-3

Disassembly Flowchart .................................................................................................5-4

5.1.1 AC

Cord................................................................................................................5-5

5.1.2 Drum/Toner

ASSY ...............................................................................................5-5

5.1.3 Paper

Tray............................................................................................................5-6

5.1.4 Rear

Cover ...........................................................................................................5-7

5.1.5 Rear Chute Cover ................................................................................................5-8

5.1.6 Side

Cover

L.........................................................................................................5-9

5.1.7 Side

Cover

R ......................................................................................................5-10

5.1.8 ADF

Unit.............................................................................................................5-11

5.1.9 Pull Arm/Pull Arm Guide/Lock Claw Pull Arm Spring.........................................5-25

5.1.10 Scanner Unit.......................................................................................................5-26

5.1.11 Panel Unit...........................................................................................................5-26

5.1.12 NCU PCB ...........................................................................................................5-30

5.1.13 Speaker ..............................................................................................................5-31

5.1.14 Joint Cover ASSY/Paper Stopper/Battery ASSY ...............................................5-33

5.1.15 Front Cover ........................................................................................................5-36

5.1.16 Pickup Roller Holder ASSY................................................................................5-38

5.1.17 Fixing Unit ..........................................................................................................5-42

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