Epson 20 - Manual (Page 78)

You see a screen of information reminding you that the heads will not
be unlocked until you reset the computer or turn the power off and
on again. Next the program moves the heads and disables the
keyboard. You can now turn off the computer and prepare to move it
to the new location.
Turning Off the Computer
Before turning off your computer, save your data, exit the program
you are using, and remove any diskettes from the disk drives. Turn off
the computer first, then turn off the monitor and any peripherals.
Using the Equity 386 4-21