Epson EQUITY 386/33 PLUS - Manual (Page 46)

7. Before you touch any of the components, touch the inside of
the computer’s back panel, as shown below, to ground
yourself and avoid an electric shock.
WARNING
Be sure to ground yourself to the inside back panel of the
computer every time you remove the cover. If you are not
properly grounded, you could generate an electric shock
when you touch a component.
3-4 Accessing Internal Components