A. To identify the problem, note which headsets and radios are operating without an issue:
1. Bind the radio in concern with another good radio by following the binding procedure.
2. Test each headset with each radio in combination to confirm. As you perform this, make note of where the problem persists. It is a headset issue if the problem carries over to each device, and a radio issue if the problem is consistently on one device. For headsets, the most probable cause is damage, and the headset will need to be replaced.
For radios, identify which part of the radio is having issue:
1. Make sure the units are still bound and test the radio in concern to see if it can hear the good radio. If it cannot, then it's a speaker related issue, otherwise, go to step 2.
2. Test the good radio to see if it can hear the radio in concern. If not, then it's a mic related issue.
*For Yapalong-4000, if the radios work at a short distance but not after 50 meters, it could be an antenna related issue. This issue can be fixed by replacing the antenna.
If you are under warranty, please contact 'firstname.lastname@example.org' with your issue in the subject line and we will be happy to assist you.