Brother MFC-9420CN - Making Copies; How to Copy

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 OPC Belt Cartridge ..............................................................................................5-6
5.1.3 Paper Tray............................................................................................................5-6
5.1.4 Fusing Unit ...........................................................................................................5-7
5.1.5 Side Cover LR ....................................................................................................5-11
5.1.6 Top Side L ..........................................................................................................5-12
5.1.7 ADF Unit.............................................................................................................5-13
5.1.8 Scanner Unit.......................................................................................................5-28
5.1.9 Pull Arm/Scanner Slider L, R .............................................................................5-29
5.1.10 IS Lock Lever ASSY...........................................................................................5-30
5.1.11 Tray (TP) ............................................................................................................5-30
5.1.12 Panel ..................................................................................................................5-31
5.1.13 Battery ASSY .....................................................................................................5-35
5.1.14 Main PCB ...........................................................................................................5-36
5.1.15 NCU PCB ASSY ................................................................................................5-37
5.1.16 Top Side R .........................................................................................................5-38
5.1.17 Cleaning Roller Cover PU / Cleaning Roller PU ................................................5-38
5.1.18 Top Cover...........................................................................................................5-39