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PREPAR
AT
ION
-
conf
i nued
8.
When
closing
or
reattaching
the
parts
with O-rings,
be sure
that
each
O-ring
seats
properly
and
securely.
All
four
O-rings
must be
properly
aligned
and
not
"pinched."
The
preceding instructions
must be
performed
on
each
user-serviceable
O-ring
prior
to each
dive
day
and,
if
possible,
prior
to each
dive.
By
following
these
procedures
and
all other
procedures
in this
instruc-
tion
manual.
you
will be
able
to enjoy
using
your
Nikonos-V
for
many
years.
Reminder:
An extra set
of
O-rings
(one
each
for
the
camera
back,
lens,
flash sync socket,
and
battery
clip)
and
a tube of
lubricant
are supplied
with the
camera.
Additional O-rings
and
lubricant
are available
from
authorized
Nikon dealers
and service
centers.
The
O-rings
and
their sealing
method
The method
used by the O-rings
to
seal
and
water-
proof
the camera
is shown
in the
following
illustrations.
When a
low level of
pressure
exists
(Jor
instance,
just
under
the
water's surface),
each O-ring
seals
its
groove
by
its
own elastic
force
(see
Chart
A). When
the
pressure
increases
(at
greater
depths),
the
O-ring's
shape
is altered
and
its
sealing
ability
is
increased to
withstand the
greater pressure.
The
pressure
changes
the
ring from
its
original
"O"
shape
(when
looking at a
cross-sectional
view) to a
"D"
shaoe
(see
Chart
B).
Chart
A
OSlight
compression
Chart
B
*;*....
Pressure
10