Vic, There is not much on the Control Board that connects to pins 29 and 30 - these are the DOT/PTT and DASH lines and they connect directly to pins 17 and 18 of P3 (they also connect to 2 resistors of RP4).
Check carefully for any solder bridges at the pins of P3, the U6 socket and RP3. If you suspect U6 itself, you can remove it from the socket and check the resistance on the board itself (you should see a high resistance similar to the values indicated in the manual) - use static protection when inserting and removing U6, and put it into the black anti-static foam (or the antistatic tube) when it is removed. 73, Don W3FPR Life is what happens when you are making other plans ----- Original Message ----- From: "Vic Dively" <[EMAIL PROTECTED]> To: <elecraft@mailman.qth.net> Sent: Wednesday, June 16, 2004 9:03 PM Subject: [Elecraft] Results for Resistance Check on the Control Board > > Hello. I've started building my first Elecraft, a K2. My background in > soldering/kit building is thin, about 4 other kits, one of which actually > worked the first time I tried it out. The others required a little > trouble shooting... > > So I wanted a K2 bad enough to try building one despite all that. I've > done the Control Board, and my resistance checks show some problems, I > think. I've reviewed the solder joints and all the parts are there. I > saw where the "greater than 100K" may show up as infinite... even given > that, it looks like I may have a problem with U6. Here's what I have: > > Test Point should be my reading > P2 pin 1 >10K 1.51 M > U5, out >2K 3.74 K > U4, OUT 3-7K 4.6 K > Q1 collector > 1M 3.71M > Q2 collector > 1M 3.8 M > U3 pin 8 > 10K 196K > U6 pin 13 >100K open > U6 pin 14 >100K open > U6 pin 29 70-90K 3.7K > U6 pin 30 70-90K short > U8 pin 2 >100K open > U8 pin 15 >100K open > U8 pin 16 >100k open > > I see where more control board tests follow building the front panel. Do > I have a problem that should be resolved now, especially the U6 pins 29 > and 30 problem, or is it easier to trouble shoot at the next stage? > > Thanks > > Vic KG4HTT > > ________________________________________________________________ > The best thing to hit the Internet in years - Juno SpeedBand! > Surf the Web up to FIVE TIMES FASTER! > Only $14.95/ month - visit www.juno.com to sign up today! > _______________________________________________ > Elecraft mailing list > Post to: Elecraft@mailman.qth.net > http://mailman.qth.net/mailman/listinfo/elecraft > You must subscribe to post. > Subscriber Info (Addr. Change, Unsub etc): http://mailman.qth.net/subscribers.htm > Elecraft page: http://www.elecraft.com > _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net http://mailman.qth.net/mailman/listinfo/elecraft You must subscribe to post. Subscriber Info (Addr. Change, Unsub etc): http://mailman.qth.net/subscribers.htm Elecraft page: http://www.elecraft.com
