Nikon Nikonos Speedlight SB-103 Kullanım Kılavuzu - Sayfa 8
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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
p ro ce dur es in thi s i ns truc ti on m anual , y ou w il l be abl e
to enjoy using your Nikonos Speedlight SB-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
un de r t he wa ter's su rface) , eac h O-ri ng se als its c hann el
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" shape (see Chart B).
30tr
Pressure