Epson EL 3S/33 - Manual (Page 53)

Remove the two retaining screws securing the power supply
to the back of the computer and the third retaining screw
holding the power supply to the base of the computer. Be
careful not to disconnect any of the cables. Slide the power
supply out of the way.
2. Remove the retaining screws securing the option slot cover
to the computer. (Keep the screw to secure the option card
to the computer.)
3. Slide out the slot cover and set it aside. (Store it in a safe
place in case you remove the option card later.)
4. Unpack the option card and adjust any switches or jumpers
on it, if necessary. (Check the option card instructions.)
When you handle the card, be careful not to touch any of
the components on the circuit board or the gold-edged
connectors. If you need to set it down before you install it,
place it gently on top of its original packing material with
the component side facing up. Keep the packing materials
in case you remove the card later.
3-14 Installing and
Removing
Options