I've been having some difficulties getting my Yaesu FT-757GX radio working. My latest problem seems to be an issue with the power supply. I had successfully setup the system and made a few contacts on 80m. Then, I decided to try my hand at some CW on 10m. In the middle of a transmission (just a second or two in to the transmission) the whole rig just up and died. I turned everything off, turned it back on and everything worked again. I went back to 80m to confirm everything was working, and it seemed OK. I then tried 10m again, and in the middle of my transmission (within a few seconds), it died again. This time, turning it off and on didn't fix the problem. I checked the back of the power supply, and sure enough, the fuse had blown. Fair enough, that's what fuses are for (though I'm not sure why it blew). I replaced the fuse. Then, before I connected the power supply back to the radio, I turned the power supply on, just to make sure it would power up. The front LED didn't light, then a moment later a puff of smoke appeared at the back just near where the AC feeds in. Needless to say, I turned it off.
Am I doing something wrong? How did it blow out when I wasn't even drawing any current? Could I have been overloading the power supply by setting the drive too high? Wouldn't the fuse protect against this? I really don't know what to make of the situation, but I'd appreciate any suggestions.
73,
-Ken
Am I doing something wrong? How did it blow out when I wasn't even drawing any current? Could I have been overloading the power supply by setting the drive too high? Wouldn't the fuse protect against this? I really don't know what to make of the situation, but I'd appreciate any suggestions.
73,
-Ken