07-16-2008, 06:46 PM
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Join Date: Jan 2007
Could be a shorted audio chip.Have you did a p.a. test??Is the signal meter
detecting signal??I know you will not be able to hear the receive audio
without the mic connected.But you can put the radio on say channel 19
and see if the signal meter is detecting signal..Also as i say do a p.a. test..
Put the radio in p.a. mode.Plug an external speaker into the p.a. jack
Then connect your mic.Then plug your mic in,and see if you are getting
audio through the p.a. stage.This test will tell you if the audio chip
is functioning properly.If when you plug the mic in.In the p.a. mode,You
get the same loud thudding sound through speaker.Then you probably
have a shorted audio chip..Or it could be one of the large elect. caps
beside the audio chip..The audio chip will be the 10 legged i.c. bolted
to the right side of the chassis rail.Radio facing you,component side up.
The audio i.c. part number is TA-7222AP