Epson EPL-N1200 Reference Manual page 83

9. With the component side of the controller board facing the
outside of the printer, fit it on the top and bottom guide
rails.
10. Slide the controller board into the printer. Press it firmly on
both sides of the bracket to lock the board into place. If the
controller board does not fit smoothly into the printer, do
not force it. Remove it and make sure the edges fit properly
into the grooves inside the slot.
11. Secure the interface bracket with the four retaining screws
that you removed earlier.
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