hf2 earphones have special filters that smooth the frequency response and prevent earwax from entering the earphones. A filter is located at the end of the earphone and is visible when the eartip is removed. If a filter becomes clogged, it should be replaced. A dirty filter will reduce earphone output. A filter should be changed if the loudness decreases or the sound quality declines.

To check: Remove the filter. If sound returns, insert a new filter.

Note: Filters are not reusable.

Removal 1. Remove eartip. 2. Insert tool into     the filter. 3. Remove filter.     Discard old filter     Filters are not     reusable.

Replacement 4. Insert a new filter     and press gently     against a hard     surface to secure     it in place. 5. Re-attach eartip.