Sega NAOMI Service Manual page 13

Ensure that the
power
is
off
before performing work.
1)
Disconnect all
of
the
wirings
connected to
NAOMI
,
and
remove
NAOMI
3)
Remove
ROM BD
Case
upward by holding both
sides.
onto
NAOMI
Main BD.
secure
ROM BD
Case
to
NAOMI
Case.
ROM BOARD