Re: [Elecraft] KPA-500: 270v error and R17 - fixed

Hi Keith, Thanks for your comments and also to several others who replied privately. I have now resolved the fault that was causing the +270v T/R bias line to be shorted and the 270v ERR hard fault to show. As several others have discovered with the same fault, the problem was C2, a faulty

[Elecraft] KPA-500: 270v error and R17

I wonder if anyone can offer some advice please? I've just put together a KPA-500 linear amplifier kit and everything seemed to work fine until I switched from standby to operate when I get a 270v ERR message, which needs a hard reset. The 60v line is present (68.5v) and the interlock works as