Chapter 5 Disassembly And Re-Assembly; Safety Precautions - Brother HL-5240 Service Manual

CHAPTER 5
1.

SAFETY PRECAUTIONS

To avoid creating secondary problems by mishandling, follow the warnings and precautions below
during maintenance work.
• Always turn off the power switch and unplug the power cord from the power outlet
before accessing any parts inside the printer.
• Some parts inside the printer are extremely hot immediately after the printer is used.
When opening the front cover or back cover to access any parts inside the printer,
never touch the red colored parts shown in the following figures.
!
CAUTION:
(1) Be careful not to lose screws, washers, or other parts removed.
(2) Be sure to apply grease to the gears and applicable positions specified in this chapter.
(3) When using soldering irons or other heat-generating tools, take care not to accidentally
damage 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.
(5) When replacing the PCB and all the other related parts, put on a grounding wrist band
and perform the job on a static mat. Also take care not to touch the conductor sections on
the flat cables or on the wire harness.
(6) Be sure to replace self-tapping screws correctly, if removed. Unless otherwise specified,
tighten screws to the following torque values.
TAPTITE, BIND or CUP B
TAPTITE, CUP S
(7) After disconnecting flat cables, check that each cable is not damaged at its end or short-
circuited.
(8) When connecting flat cables, do not insert them at an angle. After insertion, check that
the cables are not at an angle.
(9) When connecting or disconnecting cable connectors, hold the connector body, not the
cables. If the connector has a lock, release the connector lock first to release it.
(10) After a repair, check not only the repaired portion but also all connectors. Also check that
other related portions are functioning properly before operational checks.
DISASSEMBLY AND RE-ASSEMBLY
M3: 0.5N m
M4: 0.8N m
M3: 0.5N m
HL-5240/5250DN/5270DN/5280DW SERVICE MANUAL
WARNING
5-1 Confidential