Epson EPL-N2750 Reference Manual page 151

11. Push the plate down into place. Then fasten the two retaining
screws that you loosened earlier.
12. Gently replace the top cover until it clicks shut.
To confirm that the Adobe PostScript 3 ROM module is installed
correctly, print a status sheet. If PS3 is not listed as an installed
emulation on the status sheet, try reinstalling the module making
sure that it is securely fastened to the ROM slot.
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