Anytone Anytone D578UVIII Plus - No TX audio

[k8diy]

I think the microphone element in my mic has died, but not sure how to confirm it. The radio transmits "properly", it will send APRS packets, it can establish a digital connection with a DMR repeater, but when keyed up, it does not send any audio.

It will also send DTMF tones, when the keys are pressed while holding down PTT.

It doesn't matter what mode, or what band - no tx audio for vhf, uhf, analog, digital.

I only have the one Anytone mic. I have Yaesu and Kenwood mics with the same 8P8C connector, but I doubt the pinouts are compatible.

I have done a factory reset on the radio and tested with the "default" codeplug stored in rom. I have also re-flashed the latest firmware, and re-built my codeplug, none of which made any different.

Any other suggestions?

 

[AB4BF]

I think the microphone element in my mic has died, but not sure how to confirm it. The radio transmits "properly", it will send APRS packets, it can establish a digital connection with a DMR repeater, but when keyed up, it does not send any audio.

It will also send DTMF tones, when the keys are pressed while holding down PTT.

It doesn't matter what mode, or what band - no tx audio for vhf, uhf, analog, digital.

I only have the one Anytone mic. I have Yaesu and Kenwood mics with the same 8P8C connector, but I doubt the pinouts are compatible.

I have done a factory reset on the radio and tested with the "default" codeplug stored in rom. I have also re-flashed the latest firmware, and re-built my codeplug, none of which made any different.

Any other suggestions?

Do you feel comfortable opening up the mic and checking the solder connections? The chinese kid that soldered it may have been having a bad day, lol...

 

[k8diy]

Do you feel comfortable opening up the mic and checking the solder connections? The chinese kid that soldered it may have been having a bad day, lol...

When I get a chance I'm going to hook it up to a scope and see if the microphone is putting anything out. From the pinouts I there's a mic + and mic ground ... question is, does the element need a DC bias voltage to function.

I think I'll contact BridgeCom before I open anything up, the radio is less than a year old, still within the warranty period.

 

[k8diy]

Do you feel comfortable opening up the mic and checking the solder connections? The chinese kid that soldered it may have been having a bad day, lol...

My friend, you nailed the cause exactly! Ground wire must have been hanging on by a whisker, looks like it never actually made it into the solder blob. Doused it with some flux and a little poke of the iron, the radio is back in business.