Sony VAIO PCV-J150 Reference Manual page 42

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VAIO® Reference Manual
5
If you do not replace the card or install another add-in card, install a
slot cover over the vacant slot at the rear of the chassis (see
an Open I/O Slot"
6
Replace the cover (see
on page 41).
"Replacing the Side Panel"
"Covering
on page 25).