Epson EPL-6100 Reference Manual page 114

Note:
Be careful to avoid dropping screws into the printer when removing
them. It may be helpful to use a magnetic screwdriver.
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4. Identify the slot into which the DIMM is to be installed. The
DIMM is installed into the RAM slot (gray).
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12 Installing and Removing Options
Caution:
Make sure that the printer is turned off.
Remove only two screws attaching the right side cover.
Warning:
Removing other screws and covers will expose high
voltage areas.
Be careful when working inside the printer as some
components are sharp and may cause injury.
Warning:
Avoid touching the electrical components that are exposed
after you remove the side cover. Be aware that these
components may become hot while the printer is in use.