Brother MFC640CW - Page 86

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 target 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 Target Component ..................................................................5-3
 Disassembly Flowchart ........................................................................................5-4
5.1.1 Draining the Ink from the Ink Tubes -- Be sure to perform draining
before removing the head/carriage unit, ink refill ASSY or engine unit. -- ..........5-5
5.1.2 Jam Clear Cover...........................................................................................5-7
5.1.3 Scanner Cover (Scanner Unit).......................................................................5-8
5.1.4 ADF & Document Cover ASSY ....................................................................5-14
5.1.5 Control Panel ASSY and Scanner Open Sensor Actuator..............................5-23
5.1.6 Center Panel ASSY and Color LCD (MFC820CW)........................................5-27
5.1.7 Upper Cover...............................................................................................5-29
5.1.8 Hook Switch Actuator and Hook Switch PCB (MFC640CW)...........................5-31
5.1.9 Head/Carriage Unit.....................................................................................5-33
5.1.10 Backup Battery (MFC640CW/820CW) .........................................................5-42
5.1.11 Ink Refill ASSY ...........................................................................................5-44
5.1.12 Media Module Cover, Main PCB, and WLAN PCB ........................................5-45
5.1.13 MJ/PS Shield Box, MJ PCB* and Power Supply PCB....................................5-50
5.1.14 Ink Absorber Box........................................................................................5-52
5.1.15 Engine Unit and Maintenance Unit...............................................................5-54
5.1.16 Components on the Engine Unit ..................................................................5-56
5.1.17 Routing of the Harnesses and Flat Cables....................................................5-69
5.2 LUBRICATION......................................................................................................5-75