Epson P-4000 Basic Manual page 19

If you are using a CompactFlash adapter, put the card
into the adapter and insert the adapter into the slot.
Caution:
Make sure you insert memory cards in the correct
orientation. Otherwise, the card and P-4000 may be
damaged.
To remove a card from the slot, first make sure
C/F Card
the light is off. Then press the eject button and
Access
pull out the card.
If the button is not sticking out, press it once to pop it
out, then press it again to eject the card.
Note:
If you are using a CompactFlash adapter, remove the
adapter from the P-4000; do not remove only the memory
card.
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