Epson ActionLaser 1600 - Manual (Page 15)

Reinserting the controller board
Note:
If you are installing additional memory, install it on the controller
board before you reinsert the board. See your printer manual for
instructions.
1. Hold the controller board level and fit its right edge into the
right groove inside the board slot. Then gently fit its left
edge into the left groove.
2. Slide the controller board into the printer until it locks in
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.
3. Secure the board with the four silver screws you removed
earlier.
Setup 1-7