Epson AcuLaser C1900 Reference Manual page 187

You can purchase DIMMs from various vendors. See "Memory
module" on page 324.
Note:
The total printer memory is the standard 32MB plus the optional
DIMM. For example, if you install an optional 64MB DIMM, the total
printer memory is 96 MB.
Follow these steps to install an optional memory module.
Warning:
w
Be careful when working inside the printer as some components
are sharp and may cause injury.
Caution:
c
Before you install a memory module, be sure to discharge any
static electricity by touching a grounded piece of metal.
Otherwise, you may damage static-sensitive components.
1. Turn the printer off and unplug the power cord.
Installing Options
6
6
6
6
6
6
6
6
6
6
6
6
187