Epson ACULASER M8000 series - Manual (Page 131)

6. Close cover B.
Note:
When the optional Duplex Unit is installed, close the Duplex Unit’s cover after closing cover B.
7. Reconnect the interface cable and power cord, and then turn on the printer.
Memory Module
By installing Dual In-line Memory Module (DIMM), you can increase printer memory up to 576 MB.
You may want to add additional memory if you are having difficulty printing complex graphics.
EPSON AcuLaser M8000 Series User's Guide
Installing Options 131