Brother Facsimile Equipment MFC7420 - Manual (Page 70)

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