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PREPARATION-continued _ _ -----'--_ _ _ _
The preceding instructions must be performed on each
O-ring prior to each dive day and
,
if possible, prior to
each
dive.
By following these procedures and all other
procedures in this instruction manual
,
you will be able
to enjoy using your Nikonos.8peedlight 8B-103 for many
years.
Reminder:
An extra set of O-rings and a tube of
lubri-
cant are supplied with the flash unit. 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 waterproof
the flash unit is shown in the following
illustrations.
When a low level of pressure exists (for
instance,
just
under the water 's
surface),
each O-ring seals its channel
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
"0"
shape (when looking at a cross-
sectional view) to a "D
"
shape (see Chart B).
Pressure
i
Jr-
Chart A
Chart B
o
Slight compression
6
0°"'"
300
D-ring lubricant