Perhaps read voltages in manual and compare to what you measure. Note the conditions under which those voltages were measured. 73, Phil w7ox On 3/21/14, 12:38 PM, Brian - N5BCN wrote: > The KDSP2 manual's troubleshooting sections says to "check U1 and D3" but > I'm not sure what I'm supposed to be checking them for. > > 73 Brian N5BCN > >