Epson AcuLaser C4000 Owner's Manual page 258

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7. Remove the ROM module from the slot A. Store the ROM
module in an anti-static packet such as the one it came
packaged in.
8. Slide the circuit board tray into the printer.
9. Fasten the circuit board tray with the two screws.
10. Reconnect all the interface cables and the power cord.
11. Plug the printer's power cord into an electrical outlet.
12. Turn on the printer.
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Using Options
Caution:
Do not remove the ROM module from the ROM slot P.
Otherwise, the printer will not work.