Epson EQUITY 3865X/20 PLUS - Manual (Page 107)

7. Before you touch any of the components inside, touch the
inside of the computer’s back panel, as shown below to
ground yourself and avoid an electric shock and to avoid
damaging the components.
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.
5-4 Accessing Internal Components