IBM 5155 Manual To Operations page 239

10
Carefully tilt the system unit up so it rests on its
front panel.
CAUTION
The system unit cover is now loose. Before
tilting the system unit up, center it on the
work area to ensure it
will
not fall off the
table.
11
Slide the system-unit cover up until it clears the
frame of the system unit. Set the cover aside.
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Option Installation 4-11