Epson ActionDesk 4000 User Manual page 119

Also, you may not have changed the SETUP program or the
jumpers to recognize the new cache. Make sure you have set
the External cache option to Enabled and set both the
System shadow and the Video shadow optionsto
Enabled.
See Chapter 4 for instructions on changing the jumper settings
or information on installing external cache; see Chapter 2 for
instructions on using the SETUP program.
Troubleshooting 6-15