Olympus PT-030 Mode D'emploi page 73

7. Maintaining the Waterproof Function
Remove the O-ring.
Open the Case and remove the O-ring from the Case.
Removal of the O-ring
Insert the O-ring remover between the O-ring and the O-ring
groove.
Pass the tip of the inserted O-ring remover below the O-ring. (Be
careful not to scratch the O-ring groove with the tip of the O-ring
remover.)
Hold the O-ring with your fingertips after it has come out of the
groove and remove it from the Case.
Remove any sand, dirt, etc.
After visually checking that dirt has been removed from the O-ring,
checking for attached sand and other foreign matter, as well as for
damage and cracks can be done by squeezing the entire
circumference of the O-ring lightly with your fingertips.
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