Epson EPL-6100 Reference Manual page 115

Caution:
c
Before you install the module, be sure to discharge any static
electricity by touching a grounded piece of metal. Otherwise,
you may damage static-sensitive components.
5. Firmly insert the DIMM into the RAM slot (gray) at an angle
as shown below. Hold both sides of the DIMM and turn it to
the perpendicular to lock it into place.
Installing and Removing Options
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