Al, With that new information, I can say that the problem is in the VFO Range Selection area. It could be relay(s) or it could be capacitors. Do you have soldering iron burned cases on any of K13, K14 or K15? If so, those relays should be replaced since that is the most likely problem.
If the relay cases look good, then it is time to measure the relay contacts with your ohmmeter. Use the schematic (RF Board sheet 2 to determine the pins associated with the set and reset state of the relays - they are shown in the reset state. Then switch to each band and consult the chart at the upper left of the Schematic Key page to see which of relays K13, K14 and K15 are set for that band. Confirm with your ohmmeter that there is continuity between the correct pins of the relay. Continue for other bands until you have confirmed that the proper relays have been set, and also check that those which are supposed to be reset are actually in that state. It is also possible that you have a bad output from the I/O Controller and the relay is not getting the pulse to set, but that is a rare occurrence. 73, Don W3FPR On 9/6/2011 9:03 AM, Alan Davenport wrote: > I just performed the VCO voltage checks you asked for and here are the > results. It looks like it was worse than I thought. 40,30,20 and 12 meteres > are all within spec. The other bands are as follows: > > 3.5 MHz = no output > 4.0 MHz = no output > 18.0 = 7.94v > 18.2 = 7.94v > 21.0, 21.45, 28.0 and 28.8 are all also fixed at 7.94V. > > I never noticed the other bands had gone dead as I operate mostly on 40m CW > some operation on 20m and 30m. "When are the higher bands ever going to open > up?" hihi > > 73 de Al, W2GZN > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
