Lenovo ThinkSystem ST250 V2 Maintenance Manual page 210

Hazardous voltage, current, and energy levels might be present. Only a qualified service technician
is authorized to remove the covers where the label is attached.
• S033
CAUTION:
Hazardous energy present. Voltages with hazardous energy might cause heating when shorted
with metal, which might result in spattered metal, burns, or both.
Attention:
• Read the "Installation guidelines" on page 85 to ensure that you work safely.
• Turn off the server and peripheral devices, and disconnect the power cords and all external cables (see
"Power off the server" on page 13).
• If the server is in a rack, remove it from the rack.
• Remove any locking device that secures the server cover, such as a Kensington lock or a pad lock.
Watch the procedure
A video of this procedure is available at YouTube:
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Procedure
Step 1. Remove the server cover.
a. Loosen the thumbscrew that secures the server cover with a screwdriver.
Note: The thumbscrew is an integrated part of the server cover. Do not try to remove it from
the server cover.
b. Slide the server cover towards the rear of the server until the server cover is disengaged
from the chassis.
c. Pivot the server cover outwards and remove it from the chassis. Place the cover on a flat
clean surface.
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https://youtube.com/playlist?list=PLYV5R7hVcs-
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