Hi all - Started build of my K2 a few weeks back and have been slowly progressing. I must say I'm not an overly experienced builder - I've built a number of smaller kits, the largest being an MFJ shortwave regen receiver and one of the "Ice Tube" clocks you can find online - but all of my builds thus far have ended with success. Through Part 1 of the RF board tests, all was well. Upon reaching the part 2 tests, things appeared to be fine as well (4 MHz Oscillator Calibration checked out ok, and PLL Reference Oscillator Range Test was fine as well). However when I proceded to the VCO Test, the problems started - with the first appearance of the Info 080 message. I've had no luck in fixing the problem since. Here's what I've found/checked:
1.) X2 on the control board is the proper crystal - I was able to hear it on another receiver and zero-beat it by adjusting C22 2.) Resistance between pin 28, U1 (RF board) and pin 40, U6 (control board) is 197 to 198 ohms - well below the 900 to 1000 it should be 3.) Voltage on pin 28 of U1 (RF) is 0.14 V (close to 0, certainly nowhere near the 5-6 V range) - this apparently indicates that U1 is not programmed AND that the Aux Bus is open, although I've had no luck figuring out where the problem is with the Aux Bus 4.) Checked voltage on pin 32 of the MCU (U6, control board) and found it to be exactly 5 V - checks haven't indicated any problems with the MCU I can find 5.) I currently have no relay sound at startup. I did previously (even with the first few startups of the Part 2 tests) however sometime after these problems started, the relay activity stopped. 6.) Checking pins 1 and 20 of U1 on the RF board both give me 6 V 7.) Measuring pin 28 of U1 to ground with power off gives me a high resistance value I attempted a "456" reset as I've seen mentioned elsewhere - this seemed to do no good as following the 10 seconds of Info 201 message, instead of the "Elecraft" message, I got the Info 080 message again. Pressing any button to continue past that results in a display of 00000.00 and what looks like part of the number 2, NOT the c to indicate CW mode. I assume this is a result of U1 not properly communicating with U6 at this point. Any suggestions? At this point I'm fairly certain I have a fried (or "unprogrammed") U1, but I suspect I've got some other problem as well. (I have been using an anti-static mat and wrist strap while building, however my soldering iron itself isn't grounded and perhaps should be.) I'm quite the novice in terms of electronics so I can't really interpret the numbers I'm seeing other than to compare them to the baselines and see where things aren't correct. Not totally discouraged at this point, but definitely distressed... Thanks in advance for your help! -- View this message in context: http://elecraft.365791.n2.nabble.com/Info-080-message-started-with-RF-Alignment-and-Test-Part-II-tp7564545.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
