Kenwood NX-300 Speaker/Mic Issue

[krantzc93]

I have a Kenwood NX-300 -K3, for some reason when I connect a speaker mic to the radio, no audio will come from the speaker mic. I can key up the radio using the mic just can't get audio from the speaker. I have tried multiple speaker mics that I know work on other NX-300s (KMC-41s). With out the speaker mic, the radio speaker works just as normal. I thought it could possibly be dirty contacts but I cleaned them and still no luck.

I can't find anything in the program that would cause this. I'm willing to take apart the radio and do some trouble shooting but I wanted to see if anyone else has had this issue. I can't be certain, but I want to say the issue started after I had the firmware updated. I believe I've used a speaker mic before the update but it's been so long since I've attached a mic that can't remember.

I've tried searching a thread for this issue but haven't had any luck. So I apologize if this is something already talked about. I appreciate the help!

 

[ohiohonda]

I have not seen any firmware cause the issues that you are having . The current firmware is V5.20 which was released last month. Attached is the side connector diagram with each pins description. I would look at pins 2 and 3 for the speaker audio connections.

 

[mmckenna]

Before you take the radio apart, take a look at the following:

In KPG-111, under "Optional Features 1", "Common Page 1", make sure your "External Mic Sense is not turned way down. Try 0dB (Normal).

If it does this only when in NXDN mode, then check the NXDN tab, "General 2" and make sure you have the right mic type selected, although this probably isn't the cause.

Could be someone monkeyed with the settings in maintenance, or could be something internal to the radio.