Hi all. I have a cobra 2000 that is not TX or RX. When I turn it on all the lights meter's and channels seem to be working. To get any sound at all you have to turn the vol and rf gain wide open. I can put it on PA and it comes though the spker but that's it. When I key the mic the meters jump but not much. On ssb the noise is louder but like i said that is with the the raido wide open. I tryed a d104 mic on it and it made no change. I took the top and bottem off to look for burned spots but i see none. If anyone has an idea whats the cause is let me know Thanks.