Brother MFC5490CN Service Manual page 150

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.
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 ....................................................................................... 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 Edge Covers, Side Covers, Speaker, Upper Cover, Encoder Guard Film,
and Rear Under Cover .............................................................................. 6-29
6.1.8 Ink Cartridge Cover, Media Module Cover, and Front Cover .................... 6-33
6.1.9 Main PCB .................................................................................................. 6-34
6.1.10 MJ/PS Shield Unit (MJ PCB and Power Supply PCB) .............................. 6-37
6.1.11 Head/Carriage Unit and Ink Refill ASSY ................................................... 6-45
6.1.12 Ink Absorber Box, Ink Absorber Felt, and PF Encoder Disk ..................... 6-57
6.1.13 Engine Unit and Flushing Box ................................................................... 6-59
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, Registration sensor actuator,
Registration sensor PCB, PF encoder PCB, Paper pull-in rollers,
and ASF gear shaft outer) ......................................................................... 6-62
6.1.15 Paper Tray ASSY ...................................................................................... 6-72
6.1.16 Routing of the Harnesses, Flat Cables, and Ink Supply Tubes ................. 6-75
6.2 LUBRICATION........................................................................................................ 6-86
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