Nikon SB-102 os Kullanım Kılavuzu - Sayfa 6
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PREPARATION-continued
_ _ _ _ _ _ _
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 pro
-
cedures and all other procedures in this instruction
manual
,
you will be able to enjoy using your Nikonos
8peedlight
8B-102 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 groove
by
its
own
elastic force (see Chart
A). When
the pres
-
sure 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
)y-
Chart A
Chart B
• Slight compression
6
O-rings