The Radio Information Board

I'm hoping that this is the place to ask. We are not getting any sound out of the external speaker on our mobile radio. It used to work, now the only thing we get is sound from the internal. I'm hoping nothing got shorted out in the radio, but if it did, how would we fix it? Any help is appreciated.

How is it connected to the radio? Does the radio use the HHC?

I'm not sure what the HHC is. I'm just a dumb end user. The speaker is connected to the accesory connector to pins 1 and 2 like it shows in the installation manual. Hope that helps. Thanks.

HHC is the handheld controller....BIG mic with a display and a keypad on it. The standard head is rectangular and you'd have a plain mic.

The internal speaker is wired with a jumper from acc pins 1-3, external spkr connects to 1 & 2 as you said. So...if the internal works OK, the speaker audio is getting out of the radio.

I suspect a problem with the wiring to your external speaker, or the speaker itself. Try connecting another speaker to 1 & 2. Check pin 2 on the accessory connector to make sure it is not broken or pushed back.

You COULD have a bad wire to pin 2 in the accessory pigtail cable coming from the radio, but it's much less likely.

I've tried swapping the radio out with another and using all of the same cables, and I get the same result. This has led me to believe that it was something in the radio.

If I understand correctly-you swapped in another radio using the same cables. Internal speaker works, external doesn't...correct?

Well, then, it ain't the radio. Both internal and external speakers use the same common audio amp - If the internal speaker works the audio amp is working.

FWIW, audio amp, is a TDA1519. According to the datasheet for a TDA1519 audio amp, it is internally protected against shorts to ground...pretty hard to fry it.

I still think your problem is in the wiring or the external spkr itself.