Brother MFC-3340CN Service Manual page 97

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.
5.1 DISASSEMBLY/REASSEMBLY ..................................................................................5-1
n Safety Precautions....................................................................................................5-1
n Tightening Torque ....................................................................................................5-2
n Preparation..............................................................................................................5-3
n How to Access the Target Component .....................................................................5-3
n 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, Blank Cover* and Handset Mount** ......................................5-6
5.1.3 Top Cover ........................................................................................................5-7
5.1.4 Control Panel ASSY .........................................................................................5-9
5.1.5 Components on the Top Cover (Document Pressure Bar and
Document Front and Rear Sensor Actuators) .................................................5-12
5.1.6 Upper Hook Switch Actuator (FAX1940CN/1840C).........................................5-13
5.1.7 Front Cover, Media Module Cover*, and Harness Cover.................................5-14
5.1.8 Document Feed Roller and Document Ejection Roller.....................................5-15
5.1.9 CIS Unit .........................................................................................................5-16
5.1.10 Document Pressure Roller and Pinch Rollers .................................................5-18
5.1.11 Upper Cover...................................................................................................5-19
5.1.12 Lower Hook Switch Actuator and Hook Switch PCB (FAX1940CN/1840C)......5-20
5.1.13 Reinforcement Plate and Scanner Drive Unit (Scanner Motor,
Document Pull-in Roller, and Document Separation Roller) ............................5-22
5.1.14 Head/Carriage Unit.........................................................................................5-25
5.1.14.1 Old Type of Head/Carriage Unit ..............................................................5-25
5.1.14.2 New Type of Head/Carriage Unit ............................................................5-33
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