All,
The other week my U3s stopped working, it coincided with a nearby thunderstorm. I had been tx'ing wspr and qrss at the time, noticed spots had ceased, checked U3s and just a blank blue screen, the QLG2 lights were all still blinking.
So far, replaced MCU with new one from Hans, changed screen in case this one had burnt out, listened to 27MHz crystal, checked all wiring secure. I have the OCXO fitted, this still heats up.?
I believe that the clock on the SI5351 chip on board the OCXO has stopped working, I will probe the outputs to the MCU and PA this weekend, presumably if the 5351A unit is toast then the mcu will not output any text to screen or output power. Filter relay board fitted.
There's very little that can go wrong on the U3s unlike some other kits, I did have the plain 5351A board but gave it away so unable to do a quick swap and check.
Other than the above any?thought's on other suggestions to look at.
Andy
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