Oki OKIMATE 10 Handbook page 12

Make sure your OKIMATE on/off switch is
still OFF (plugging the printer in with it
turned on can cause damage.) Insert the plug
in to a g rou n d ed electric a l outlet. DO N O T
use a conversion cord, lik e an exten sion cord,
w h ich ignores the ground— OKIMATE m u st
alw ays b e grounded.