Brother MFC5890CN - Chapter 6 Disassembly;Reassembly and Lubrication

Confidential
CHAPTER 6 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 target components.
This chapter also covers screw tightening torques and lubrication points to which the specified
lubricants should be applied during reassembly jobs.
CONTENTS
6.1 DISASSEMBLY/REASSEMBLY .............................................................................6-1
 Safety Precautions..............................................................................................6-1
 Tightening Torque ...............................................................................................6-2
 Preparation .........................................................................................................6-3
 How to Access the Target Component................................................................6-4
 Disassembly Flowchart.......................................................................................6-5
6.1.1 Jam Clear Cover and Inner Back Cover....................................................6-6
6.1.2 Scanner Cover (Scanner Unit) ..................................................................6-7
6.1.3 ADF & Document Cover ASSY .................................................................6-12
6.1.4 Disassembly of ADF & Document Cover ASSY .......................................6-14
6.1.5 Control Panel ASSY..................................................................................6-25
6.1.6 Disassembly of Control Panel ASSY.........................................................6-26
6.1.7 Backup Battery, Front Cover, Side Covers, Speaker, Upper Cover,
MJ Side Cover, Encoder Guard Film, and WLAN PCB*............................6-28
6.1.8 Ink Cartridge Cover and Media Module Cover..........................................6-35
6.1.9 Main PCB ..................................................................................................6-36
6.1.10 MJ/PS Shield Unit (MJ PCB and Power Supply PCB) ..............................6-39
6.1.11 Head/Carriage Unit and Ink Refill ASSY ...................................................6-44
6.1.12 Ink Absorber Box, Ink Absorber Felts, and PF Encoder Disk....................6-56
6.1.13 Engine Unit and Flushing Box...................................................................6-58
6.1.14 Components on the Engine Unit (Earth spring, Maintenance unit,
ASF motor*, Carriage motor, Star wheel holder, Paper ejection roller,
Platen, Inner chute ASSY, Sub chute cover,
Registration sensor actuator, Registration sensor PCB,
PF encoder PCB, Paper pull-in rollers R and L,
ASF gear shaft outer, and PE actuator) ....................................................6-61
6.1.15 Bank ASSY and Base Pad on the Paper Tray ASSY................................6-73
6.1.16 Routing of the Harnesses, Flat Cables, and Ink Supply Tubes.................6-74
6.2 LUBRICATION........................................................................................................6-85