++++++++++++++++++ Date: Tue, 12 Mar 2002 10:40:49 -0600 From: k4zm at comcast.net Subject: Re: [Elecraft] K2 BFO Test Showing "0000.0" To: Kirby Davis Cc: elecraft at mailman.qth.net Kirby: First I would make sure you have the freq counter probe connected to TP2. If it is indeed connected to the TP2 point then I would check to make real sure you have installed R98 & R99 on the bottom of the board and that you connected the leads of L33 to the coreect points on the board. Check the voltage at Pin 8 of U11. If you have a scope you can check to see if the oscillator is ocscillating by putting your scope probe o the junction of L33 and D37. Also make sure that Q24 is installed and check to make sure it is installed correctly. Also make sure you have not installed U11 backwards. My first guess is the absence of R98 or R99. 73 & Good Luck. If you were closer I would be glad to take a look at it for you. Jim Younce K4ZM K2 SN: 18 K2 Field Tester ----- Original Message ----- From: Kirby Davis To: Sent: Tuesday, March 12, 2002 05:57 Subject: [Elecraft] K2 BFO Test Showing "0000.0" Good Morning! Since I won't be able to work again on my K2 for several days I thought I would go ahead and see if I might be able to get some help in the meantime so I can be "fully armed" when I get back to the project... Last night I was going through the tests for the second phase of the RF board assembly. All of the tests were going smoothly until the BFO test. When conducting that test I received the "0000.0" display. I looked at the note following that step and also scanned through the Troubleshooting section but it was getting late and I didn't have time to really digest it. Has anyone else experienced this in building your K2? Could you possibly give me some ideas as to where to begin looking for problems? As I mentioned, everything else up to this point checked out fine. Also, I took off the bottom cover and it made no difference (I read one article on the reflector where this action isolated a problem due to L33(?) being to close to the cover). Any assistance would be greatly appreciated!! Thanks, ... Kirby (KB4UTZ) ++++++++++++++++++ From: "Kirby J. Davis" To: Date: Wed, 13 Mar 2002 23:06:28 -0500 Subject: [Elecraft] K2 BFO Test Showing "0000.0" - Resolved! First of all, many thanks to everyone who provided suggestions to= help me track down the problem... this is a great community of= folks! Well, I must say somewhat sheepishly that the problem was not= with any of the components or the board itself. After conducting some= of the tests recommended everything seemed to be OK. Then, while checking the FCTR probe to make sure it wasn't backward I= happened to move the connector at the control board and noticed a flash on= the display indicating something had changed. I then began to move= the connector and found that it was loose. After making sure that the= mini connector pins on the coax were firmly installed in the connection jack (i.e., the jack that connects to the control= board) I repeated the test and everything is measuring out great. Needless to say I am extremely relieved that I don't (yet) have= to do any major resoldering, etc. since I'm not up to the thought of= that prospect yet. Moral of the story... I made an FCTR probe that is= slightly too short... resulting in a bad connection when I= plugged it into TP2 due to the additional stretch/stress on the coax. Many thanks once again! .. Kirby (KB4UTZ)... (whew... dodged a bullet...) +++++++++++++++++