Epson 1500 - Manual (Page 152)

5. Remove the three silver screws that secure the metal bracket
on the left side of the printer. Keep the screws handy so that
you can use them to reinstall the controller board.
CAUTION:
Before you remove the controller board, make sure that
you have removed any optional cards or cartridges.
Otherwise, you my damage them.
6. Pull the tab on the bottom of the bracket to release the
controller board, as shown on the next page.
5-38 Options