Epson AcuLaser C9100 Reference Manual page 221

3. Slide the cover backward. Then tilt it toward you and remove
it.
Warning:
w
When you open the right side cover, be careful not to touch
the areas surrounding the caution label on the circuit board
since the areas may be very hot.
4. Identify the ROM module slots.
*
* ROM module slots (A, B)
Note:
There are two ROM slots, and either slot can be used to attach the
ROM module.
Installing Options
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