Preparation —continued – Nikon os Speedlight SB-102 User Manual
Page 6
Attention! The text in this document has been recognized automatically. To view the original document, you can use the "Original mode".
PREPARATION —continued.
The preceding instructions must be performed on each
user-serviceable 0-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
Speedlight SB-102 for many years.
Reminder; An extra set of 0-rings and a tube of lubri
cant are supplied with the flash unit. Additional 0-rings
and lubricant are available from authorized Nikon
dealers and service centers.
The 0-rings and their seaiing method
The method used by the 0-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 0-ring seals its groove
by its own elastic force (see Chart A). When the pres
sure increases (at greater depths), the 0-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
Chart A
O
Slight compression
Chart B