Alan, I hate to be the bearer of bad news, but I believe you are describing an encoder failure or an MCU failure at either the ENC A or ENC B inputs. It is difficult to say which it may be - the encoder is the single most expensive component in the K2 and the MCU (Control Board U6) is the second most expensive.
Replacement/substitution is the best test to determine which of those two components is failing. If you can find another ham with a K2, you may be able to try using his front panel board on your K2 - if it works, then it is the encoder - if not, then the MCU is the most likely suspect. If you have not upgraded that K2. you may want to do so at this time, including the A to B mods (along with the other mods listed in the A to B instructions, add the Keying Waveshape Mod along with a new set of IF crystals and new firmware and your early K2 will perform just as well as a brand new kit. 73, Don W3FPR On 6/15/2012 4:59 PM, Alan Slusher wrote: > I have an older K2/10 (serial 868) which has worked very well for years. > Today I suddenly became aware of a problem: I can't change the frequency > using the tuning knob (yes, I did check the frequency lock). > The final frequency number on the display blinks (eg: the "4" in 14301.24) > (happened to have been listening on the 14.300 net) but no number changes > when the frequency knob is turned, and the radio's frequency does not change > either. > No problem with frequency change using direct frequency entry (the two band > buttons followed by the frequency numbers), > and the RIT works just fine. > I did the 456 reset before reading the instructions about saving the CAL FIL > numbers, with the result that I guess I will have to go back through that > procedure (I now have to punch in 14301 and use the RIT to move to 14.301.24 > to listen on 14.300, had been spot on before). > The K3 next to it and the Kenwood 430 below it continue to work just fine > off the same two antennas (a vertical and an 80m dipole - both through > tuners). > > ______________________________________________________________ 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
