gp300 buzzing sound

johnny1225 · Post by **johnny1225** » Mon Aug 21, 2006 6:00 am

I have a uhf gp300 that everytime you put the body of the radio into the housing the audio is just a buzz, even the start up beep is just a buzz. It sound like it is grounding the speaker. If you take the board out of the housing everything is ok again. I have soldered around the board making sure there is a good ground. Reslder speaker terminals and shielding. Is there something that anyone knows about that i can do to fix this problem.

Thanks

John

Tony Soprano · Post by **Tony Soprano** » Mon Aug 21, 2006 8:12 am

The hot lead of the speaker flex has probably worn through the paper and is rubbing on the main shield. Look for wear-through from the speaker all the way to the four-pin connector.

proff · Post by **proff** » Mon Aug 21, 2006 9:37 pm

if you have a CRO look at the output of the audio amp chip. what power supply are you using?
Are you transmitting when you get the buzzing?

johnny1225 · Post by **johnny1225** » Tue Aug 22, 2006 2:42 am

i looked at the speaker flex like tony said and yes it was grounding out on the chassis, change with a new one and, bang all better..thanks toney..

regards,

john