Disassembly/Reassembly; Safety Precautions - Brother MFC5100C Service Manual

4.1 DISASSEMBLY/REASSEMBLY

Safety Precautions

To prevent the creation of secondary problems by mishandling, observe the following precautions
during maintenance work.
(1) Unplug the power cord from the power outlet before replacing parts or units. When having
access to the power supply, be sure to unplug the power cord from the power outlet.
(2) Be careful not to lose screws, washers, or other parts removed for parts replacement.
(3) Do not remove gears from the document feed roller ASSY or ejection roller ASSY if at all
possible. Once removed, they will become unusable and new gears will have to be put back in.
(4) When using soldering irons and other heat-generating tools, take care not to damage the resin
parts such as wires, PCBs, and covers.
(5) Before handling the PCBs, touch a metal portion of the machine to discharge static electricity;
otherwise, the electronic parts may be damaged due to the electricity charged in your body.
(6) When transporting PCBs, be sure to wrap them in conductive sheets such as aluminum foil.
(7) Be sure to reinsert self-tapping screws correctly, if removed.
(8) Tighten screws to the torque values listed on the next page.
(9) When connecting or disconnecting cable connectors, hold the connector bodies not the cables.
If the connector has a lock, always slide the connector lock to unlock it.
(10) Before reassembly, apply the specified lubricant to the specified points. (Refer to Subsection
4.2 in this chapter.)
(11) After repairs, check not only the repaired portion but also that the connectors and other related
portions function properly before operation checks.
(12) Once the print head 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
print head unit unusable and require replacement with a new print head 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.
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