Don, thanks for your help. Problem solved by replacing R2. Regards, Jim Brown, K5JAZ
======================================================== On 5/5/09, Don Wilhelm wrote: > James, > > With 0.1 volts at CB U6 pin 29, I would expect that the K2 may be trying > to transmit - and that would not allow access to the menu. > So -- KEEP A DUMMY LOAD ATTACHED TO THE ANT JACK until you have the > situation resolved. > > With power off, what is the resistance reading from CB U6 pin 29 to > ground (measure both on the socket and at the chip pin, they should be > the same, but check anyway) - with the paddles open (should be a high > resistance)? How about when the dash paddle is closed (should be about > 220 ohms)? > If you read a high resistance with the paddles open (or with nothing > plugged into the key jack) and approximately 220 ohms with the dash > paddle closed, I would look carefully at the soldering of CB RP4 pins 7 > and 8 - this resistor is the pull-up for the dash line and should bring > the dash line to 5 volts with the paddle open. But if those resistance > readings are not within the realm of sanity, check CB P3 pin 17 and CB > U6 socket pin 29. Make certain U6 pin 29 is not bent under the socket > nor sticking out to the side of the socket. Also check RF Board J8 pin > 17 and the inboard end of R2. > > Let us know where you find something that does not make sense. > > 73, > Don W3FPR > > > James Brown wrote: >> K2 #2535 has no menus even though all other functions appear to work. >> I did resistance and voltage checks on control board and found U6 pin >> 29 (/DASH) at .10v instead of the expected 5.0v. The 8v and 5v >> regulators are good. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
