Mic not working.

Check mic settings use Skype or other also it could be the cable is damaged to the mic

press feature button then 1. little red mic light turns on

You have to firstly test your head phones on another computer.... If it works in another computer than firstly update your anti virus program and then re install your drivers.... If it does not solve the problem you can re plug the cable of sound card on mother board... If problem does not solved than your sound card might have problem.

it sounds like it had a bad mic, If you can hear the other party but they cannot hear you its definitely a bad mic.

its ur earpiece prblm ur mic is good ur frnds can hear u but u cant so go to a mobile repair shop u will get ur work done he will ask a small amountmay be 50 to 100 rs...

if you are having an issue where you can't hear someone over the speaker, go to their phone and hit feature 1 and the mic should light up and should work.

I am not completely sure i understand whats going on. it seems like it could be a few things because of different parts of the question.

With my CB everyone else can hear me and the signal transmits fine
Good!
I have tested to see that my CB is picking up the signal
how? A meter on your radio should either light up or a needle should swing if you are receiving.
their voices don't play through my mic of my PA
A Mic is a microphone, i think you mean speaker.
Ok this may be the cause of the problem....
Try a couple of these.
First, unplug the PA Speaker, this simple act should make you to be able to hear the incoming signal.
Make sure the CB is on AM or CB not PA
If you can not hear the speaker may be busted or an internal part may be blown. (needing the expertise of a required technician)
If you can here when you do this make sure the speaker is working by plugging it into a computer. (mp3 players will barely put out enough power to make a sound audible) if this works, make sure you plug it into EXT not PA on the back of the radio.

one more thing to check. i dont know what radio you have but try turning it untill you hear static. if its all the way the other way you may not hear anything, also turn up any RX or rec. knobs.

i have limited knowledge about whats going on, but i hope this will help fixya

You can try using your left toggle button push down until you see turn on speaker phone highlighted in blue or use scroll key and just click on it and it works much better. If not try turning phone around and putting speaker to ear and then mic should pick you up but i have found in the last 3 hrs i have had this one speaker phone is easier for this big device.Well hope that helps,good luck.

Hi my phone had similar prob with nobody able to hear me, the hole for the microphone is very small and can fill with dirt and fluff. To fix it I followed a dissasembly guide found on google and took the phone apart and removed the mic(be careful its very small) cleaned out the hole and fluff of the mic the put it back together and its works fine now. Sorry cant help with the not being able to hear other person. Regards steve

i encountered this problem after i started using a bluetooth headset. when the headset is not in use (not turned on, not even with me), sometimes there is no sound from the speaker, and the other party cannot hear me. meanwhile, the call timer is clicking away indicating the call connected. it seemed there was some issue in the bluetooth stack, and the phone thought it should be communicating with the BT device rather than it's onboard speaker/mic. to resolve, i disconnect the call, go to the main screen; in the bottom right corner, use the bluetooth manager icon to turn BT On then Off again. this resets the phone's speaker/mic usage, and calls can be made like normal. i hope this helps you.