Don, thanks so much for your advice. The board traces in that area all check out good. I'll email a request to elecraft for a new D3.
If it really is bad, it makes me wonder about the 1SV149 diodes in the crystal filter circuit. I don't know how I would tell if those are functioning correctly. 73, John W8DE On Feb 24, 2013, at 4:25 PM, "Don Wilhelm-4 [via Elecraft]" <ml-node+s365791n7570316...@n2.nabble.com> wrote: > John, > > Yes, that would strongly indicate that D3 is faulty. It is good that > you confirmed RIT does change the frequency. > I don't think you will find one locally, but an email to > [hidden email] should bring you one quickly in the mail. > > Since a bad D3 is a rarity, you might also want to check for board > continuity with your DMM. Check to see that you have the same voltage > variation on one lead of C2 - that will confirm that D3 is connected to > C2. The other lead of C2 cannot be tested with voltage, so use your > ohmmeter to check for continuity between the other lead of C2 and L1. > Should you find the board has an open trace (also a real rarity), repair > it with a wire. Elecraft would send you a new board, but you already > have enough work in that board to warrant repairing it with a wire. > > 73, > Don W3FPR > > On 2/24/2013 3:27 PM, John Reed, W8DE wrote: > > Don, > > C2 and D3 look to be properly installed. I confirmed orientation from a > > 1SV149 data sheet just in case I mis-read the instructions. > > > > I can adjust receive frequency with RIT, so it looks like the D4 control is > > working. > > > > Since the D3 voltage is varying from 0v to 5.888v with the tuning pot, but > > there is no change in frequency, I'm starting to suspect a bad D3. I don't > > know of anyway to check it in circuit -- at least with the tools I have. > > I'll see if I can pick up a 1SV149 locally. I considered swapping it with > > D6, but I don't think I can remove it without damaging it. > > > > -- View this message in context: http://elecraft.365791.n2.nabble.com/K1-VFO-frequency-does-not-change-tp7570276p7570320.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
