User manual SONY APK-THA

[. . . ] Avoid using the case under the following situations: in a very hot or humid place. In these situations moisture condensation or water leakage may occur and damage the equipment. [. . . ] do not use a pointed or metal object to remove the O-ring. This kind of object may scratch or damage the case groove or O-ring. If found, wipe off with a soft cloth or tissue paper. Is there any dirt, sand, hair, dust, salt, thread scraps, etc. Lightly run your fingertip around the O-ring to check for any invisible dirt. Be careful not to leave any cloth or tissue paper fibers on the O-ring after wiping it. Carefully remove them by blowing with an air spray or by wiping them with a cotton wool bud. Be careful not to leave any fibers from the cotton wool bud inside. Fit the O-ring evenly into the groove paying attention to the following points: Check for dirt on the O-ring. Before installing the equipment into the case, close the case and immerse it in water to a depth of about 15 cm for about three minutes and check that no water leaks in. If the case is allowed to dry with sea water still in the O-ring groove, salt crystals form which may impair the O-ring's functions. The serviceable life of the O-ring varies with frequency of use of the case and conditions. [. . . ] prevent dust from collecting on the O-ring. Avoid storing the case in a cold, very hot or humid place, or together with naphthalene or camphor, as these conditions might damage the unit. [. . . ]