A little more info... Charles, N3EJS, was nice enough to point out to me that my strange resistor values of R67 and R68 sounded like they were in parallel, and had a hunch that pin 7 of the relays was probably shorting to ground.
Checking this, and Charles was right on the money (thanks, Charles!). Now, the question of why the relays pin 7 was directly connecting to ground? I reset the relays by pulling the control board, powered up, and then put things back to normal. On "normal" power up (with the control board back in place) things looked good, no short on pin 7 to ground. However, as soon as I engage "TUNE" again, the short to ground returns. So, it seems as if I have a problem in the relay logic. Essentially the antenna jack is shorting, so I have a dead short across the output, it seems. Any thoughts on how to get the relay logic figured out? Thanks again, Jeff On Thu, Feb 01, 2007 at 09:20:27PM -0500, Jeff Kinzli wrote: > Alright, a little bit of an update on my problem... > > Gary at Elecraft gave me a list of voltages to check upon TX. > > Unfortunately, my scope is old and I couldn't get it to play fair, so the > only thing I could really measure were DC voltages with my VOM. I'll probably > go ahead and start putting the RF probe together sine my scope seems tired. > > Anyhow, > > I checked R50, it's right on, good, not open. > I checked D7, it has 7.95VDC on it's anode and 7.32VDC on it's cathode. > I checked Q6, and it has 1.0VDC on it's base > I checked Q6, and it has 12.2V on it's collector (at TX) > > R67 and R68 continue to bother me, they both read 195 ohms, even when > measuring > directly across them. I don't see why that would be given the schematic, > but they are the correct color code for the given resistors, and when I > measure > I have nothing connected to the antenna jack. > > I have a sneaking suspicion it's a problem with a toroid lead, but I have > checked and rechecked them all, measuring continuity across windings at the > solder pads. > > Do any of you guys offer troubleshooting service, in person? :) > > Thanks for any ideas, > > Jeff > > On Wed, Jan 31, 2007 at 11:58:28PM -0500, Jeff Kinzli wrote: > > Oh, and I have checked, and C167 is indeed installed. :) > > > > On Wed, Jan 31, 2007 at 11:45:54PM -0500, Jeff Kinzli wrote: > > > So, I'm finally getting to the transmitter alignment section on K2 #5945. > > > > > > With a dummy load, I set power on 40M to 2W, and go into tune mode. I can > > > never get more than about 0.4W on the K2 display, and my wattmeter barely > > > moves, which would jive with that also. Moving L1/L2 through their full > > > range has no effect, the power fluctuates between 0.2 and 0.4W > > > regardless. It's the same on all bands. > > > > > > Current draw is about 0.75A in tune mode. > > > > > > I had previously aligned the receiver, and the reciever was listening > > > nicely on 40M. > > > > > > Going through the troubleshooting section, I can't find any problems with > > > the suggested troubleshooting points. > > > > > > One thing that struck me as wierd, is that the two 1% resistors that > > > Troubleshooting refers to (1.5k and 226 ohm), I think R66/67 (?) both > > > read 195 ohms, but they are the correct color code and I confirmed that I > > > checked them before installing. It appears strange to me because the > > > other resistors read correctly while installed, but these do not. So, > > > perhaps this is my problem? > > > > > > Any ideas? > > > > > > Thanks, > > > Jeff _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
