EPSON AcuLaser C3800 User's Guide
6.Hold the memory module and insert it into the optional memory slot in the orientation shown below until it stops. Then press both sides of the memory module down. Confirm that the notch on the memory module matches that of the memory slot.
*
* notch
cCaution:
❏Do not apply too much force.
❏Be sure to insert the memory facing the correct way.
❏Do not remove any modules from the circuit board. Otherwise, the printer will not work.
7.Reattach the controller option expanded aperture plate.
Installing Options 223