Have you got the circuit diagram for it?.thanks Nigel
its certainly a talking point at our local ham radio club.
really just looking for pointers .a new one inst that expensive I'm just curious as to why its failing and if i can trace the fault then its good experience for me
As I mentioned in post #9, with the problem he has it's unlikely to be a capacitor problem.i've looked but found no schematic. however, since it's a switcher, the first thing to look for is dried out electrolytic caps, as they cause 95% of switching supply failures. they might not be as obvious as the ones pictured above.