Chapter 3 Disassembly And Assembly; Precautions Before Proceeding - Brother DCP-J552DW 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
Before replacing parts or units, unplug the power cord and telephone line. Do not uses witches 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 5 to 10 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 theuser,
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.
(11) After completion of reassembly, it is recommended that the dielectric voltage withstand testand
continuity test be conducted.
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