Epson 4000 - Manual (Page 60)

Removing SlMMs
If you need to remove SIMMs from your computer (to install
different ones, for example), make sure the computer is turned
off and then follow the steps below:
1. Remove any option cards that may be blocking your access
to the SIMM sockets. (See page 4-18 for instructions.)
2. Use your fingers or a small screwdriver to carefully pull
away the metal tabs that secure the SIMM at each end, as
shown below.
Installing and Removing Options 4-13