This unit uses an waterproof packing to maintain its water resistance. The waterproof packing maintenance is very important. Failure to do waterproof packing maintenance according to the instructions may lead to water leaks and cause this unit to sink.

Inspect the waterproof packing

• Carefully check that there is any dirt, sand, hair, dust, salt, threads, etc., on the waterproof packing. If found, be sure to wipe off with a soft cloth.
• Lightly run your fingertip around the waterproof packing to check for any invisible dirt.
• Be careful not to leave any cloth fibers on the waterproof packing after wiping it.
• Check the waterproof packing for cracks, skewing, distortion, fine splitting, scratches, embedded sand, etc. Replace the waterproof packing if you find any of these.
• Inspect the waterproof packing contact surface on the case body in the same way.