Hi everyone. I need a little help if you could.
I've had my QDX v4 (12volt) up and running for quite some time with no issues. Yesterday I was doing ft8 on 20m and heard a pop and caught a whiff of magic smoke. The LED light went out.
After investigating I found that one of the bs170's had burned popped open. Maybe I had a bad swr at the moment, I'm not sure.?
I got busy replacing the blown fet and hooked everything back up. I noticed that the frequency and bands weren't changing and the audio was strange with no perceived signals.?
I measured the current draw on power up RX and found it to be about 700ma. I removed all 4 bs170's and the current didn't change. I then removed IC5 and now the current draw is around 900ma.?
I'm at a bit of a loss of what to check next. Can anyone suggest some test points with expected voltage or resistance levels?
Many thanks!
James Shrum - AB9LM
