Chapter 3 Disassembly And Assembly; Precautions Before Proceeding - Brother MFC-J3520 Service Manual

CHAPTER 3 DISASSEMBLY AND ASSEMBLY

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PRECAUTIONS BEFORE PROCEEDING

To prevent the creation of secondary problems by mishandling, observe the following
warnings and precautions during disassembly/assembly work.
WARNING WARNING
Before replacing parts or units, unplug the power cord and telephone line. Do not use
switches but unplug the power cord itself.
In particular, when having access to the power supply inside the machine, make sure
that the power cord is unplugged from the electrical outlet; when having access to
the main PCB or modem PCB, make sure that both the power cord and telephone
line are unplugged from the electrical outlet.
(1) Be careful not to lose screws, washers, or other parts.
(2) Apply grease to the points specified in this chapter.
(3) When using soldering irons and other heat-generating tools, take care not to
damage the plastic parts such as wires, PCBs, and covers.
(4) Static electricity charged in your body may damage electronic parts.
When transporting PCBs, be sure to wrap them in conductive sheets. When
replacing the PCBs and components including PCBs, put on a grounding wrist
band and perform the job on a static mat. Also take care not to touch the conductor
sections on flat cables or wire harnesses.
(5) After disconnecting flat cables, check that each cable is not damaged at its end or
short-circuited.
(6) When connecting flat cables, do not insert them at an angle. After insertion, check
again that the cables are not at an angle.
(7) When connecting or disconnecting harnesses, hold the connector bodies not the
cables. If the connector has a lock, always unlock it.
(8) After repairs, check not only the repaired portion but also that the harnesses are
routed properly. Also check that the other related portions function properly.
(9) Once the head/carriage unit prints, it will start head locking operation after five
seconds from the end of printing. The head locking operation will take five to ten
seconds. NEVER unplug the power cord before the machine completes the head
locking operation; doing so will make the head/carriage unit unusable and require
replacement with a new head/carriage unit.
When you receive the machine from the user or when you pack it for sending it
back to the user, check the head locking state.
(10) If ink gets on your skin or gets into your eyes or mouth, you need the following
treatment.
• If ink gets on your skin, wash it off immediately with soap and water.
• If ink gets into your eyes, flush them immediately and thoroughly with water. If left
untreated, the eyes may become bloodshot or mildly inflamed. If you feel any
discomfort, consult a doctor immediately.
• If ink gets into your mouth, immediately spit it out and consult a doctor.
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