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Dell U2421HE Service Manual page 9

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Assemble the front
then u
se a Philips-head screwdriver to tighten 2pcs
S11
screws(left and right) for locking the front bezel.
(No.1~2 Screw size= M3x0.5x4, Torque=3~4kgfxcm)
1
Use a Philips-head screwdriver to tighten 5pcs
S12
screws for locking the front bezel with the panel.
(No.1~5 screw size=M2x2.7, Torque=3±0.5kgfxcm)
3
2
Stick 2pcs acetate tape to fix the panel lamp cables.
Tear off all the double-faced adhesive tapes which
sticked on the back of the function key cable, and
S13
then fix the cables with the double-faced tape. Use a
proper tool to connect the function key cable to the
connector of the interface board.
4. Disassembly and Assembly Procedures
bezel with the assembled unit,
2
1
4
5
Stick 1pcs aluminum foil on the specific position to fix
S14
the function key cable as the picture below shown.
Take a USB board, a USB hub and a connect cable.
Connect the cable to the USB board, then locate the
USB board into the USB hub. Stick 1pcs aluminum
foil on one side of the USB hub, then locate the
S15
USB unit into the hook of a rear cover. Use a
Philips-head screwdriver to tighten one screw for
locking the USB unit with the rear cover. Tear off the
adhesive paper of the left and right side of rear cover.
(No.1 screw size=M3x6, Torque=4
1
0.5kgfxcm)
±

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