The O-Rings And Their Sealing Method - Nikon NIKONOS-V Instruction Manual

PREPARATlON-
continued - - - - - - - - - - - - - - ; ,
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 fo r 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.
10
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 fol lowing illustrations.
When a low level of pressure exists (for 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 alte red and its seal ing ability is
increased to withstand the greater pressure. The
pressure changes the ring from its original "0" shape
(when looking at a cross-sectional view) to a "D"
shape (see Chart B).
ChartA
Chart B
o
Slight compression