Thanks Don I will check these things. This may be over my pay grade? The CPU has been upgraded, but I’m not home to check the Revision.
I know your retired, but do you still do any repairs part time? Thanks Johnny AC0BQ On Tue, May 28, 2019 at 8:25 AM Don Wilhelm <donw...@embarqmail.com> wrote: > Johnny, > > You have a Power Control problem - alignment is not going to fix it, and > you will have to correct it and have proper power control before any of > the alignment results make sense. > > Since you indicate that the problem exists with only the base K2, that > is the place to start troubleshooting. Do not connect the KPA100 - it > must be physically removed. > > Set the power to about 2 watts, but monitor the actual power with an > external wattmeter and drive a dummy load. > Then do a TUNE while monitoring the VRFDET signal. It is easiest to > probe at Control Board P4 pin 10. Limit the time for a TUNE to 15 to 20 > seconds if the actual power is going to maximum (it may be as high as 19 > watts). > If the DC voltage on VRFDET is near zero, the RF Detector is not working > for some reason - replace RF Board D19 and try again. If still no > voltage on VRFDET, reflow the soldering on RF board R66, R67, R68, R69 > and C77. > > Should you find a DC voltage that is above 3.5 volts, D19 is working > fine, but the MCU is not responding. The most likely problem is that > the MCU (Control Board U6) has a damaged input at pin 2. In that case, > it has to be replaced. > Here things may get a little complicated depending on the level of your > current MCU. If it is 2.04P or 2.04r, you can order FW-K2MCU and simply > replace U6. If it is less than that, you must order FW-K2MCIO and > replace both CB U6 and RF Board U1. > > So hope the problem is D19, that is inexpensive, but the firmware is > expensive. > > 73, > Don W3FPR > > On 5/28/2019 7:39 AM, Johnny Matlock wrote: > > Gm Group > > I connected a newly acquitted “twin” Amp and Tuner in a separate > enclosure > > setup this weekend. > > > > While bench testing with a dummy load I noticed that I would get high a > > current message if the power setting was turned over midway, and the amp > > was trying to produce more than 100 watts! > > > > > > I disconnected the Amp and Tuner, continued to test the bare K2. > > > > On 40 meters my power setting wasn’t tracking the actual output. > > The actual power out was a lot higher than the radio’s setting. > > > > I downloaded the calibration instructions and continued testing. > > > > When I Set the power to 2 watts and attempt to peak the 40 meter coils, > > The power goes up to over 10 watts? > > > > I pulled the lids and looked at the connections around the 40 meter > coils, > > also I did a reflow on the connections in that area. > > > > > > I’m trying to understand the cal instructions? > > > > If you set the control at 2 watts and peak the two coils, and the power > is > > higher, how will it track accurately? > > > > I’m trying to decide if I have a problem > > With my Radio, or am I just not understanding the calibration > instructions?? > > > > I went to Don’s website and downloaded his condensed instructions, but I > > was too tired to give them a try!! > > > -- Check out the 4SQRP website at 4sqrp.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
