Yaesu ft290r I have recently purchased a second hand yaesu ft-290r mk 1 I had to replace the 1.5amp fuse (blown) it powers up, has tx, but no tx audio. rx hiss but no audio. also the previous owner suspects reverse polarity of the power lead ? what can be wrong , and is it repairable THANKYOU
Radio Communications - Vertex
Answers & Comments
I'm not familiar with the radio itself, but it seems from the symptoms that the audio processor/stage is the only common problem i.e: audio does not work. Do you have a schematic for the unit? If so, I would follow the DC path to the audio stage and troubleshoot in that area. The other stage that can be suspected is the regulator stage. Hope it helps a bit.