My K2/100, serial 4375 has worked flawlessly for several years. This evening, I fired it up and received an INFO 080 message. There are a number of symptoms. First, the K2 works somewhat intermittently. I tried using in on CW and found that it would operate below 5 watts, but was erratic above that level. Keying the transmitter above 5 watts would cause a staccato burst of transmission (like a string of dits) regardless of what direction the iambic paddle was keyed. Using tune, however, did not cause the intermittent operation. If you turn the unit on, sometimes you get an INFO 080 message, sometimes you do not. Sometimes it seems to reset itself from transmit to receive.
The U1 voltages on pin 1 and 20 are correct. However, there should be 6v on pin 2 and it is 0. U9 and U10 are supposed to have 0.2 and 0.15 volts respectively, but are at ground. Not suprisingly, Z5 shows no sign of life. Changing bands results in relays clicking, but the voltage drop that should be seen on pin 1 also appears intermittent. Sometimes I see a voltage drop, sometimes I don't. I also have the sense that the bands switch more slowly than usual, although this may just be my perception. Z5 being quiet would obviously hinder I/O, but I am not convinced it is at fault because there is no voltage on the associated U1 pins. It it seems equally likely that U1 is damaged. Any suggestions other than swapping out Z5 and U1? (BTW, all connections are good and complete). 73 Howard W. Ashcraft, Jr. W1WF ***************************** This communication, including any attachments, is confidential and may be protected by privilege. If you are not the intended recipient, any use, dissemination, distribution, or copying of this communication is strictly prohibited. If you have received this communication in error, please immediately notify the sender by telephone or email, and permanently delete all copies, electronic or other, you may have. To ensure compliance with requirements imposed by the IRS, we inform you that any tax advice contained in this communication (including any attachments) was not intended or written to be used, and cannot be used, for the purpose of (i) avoiding penalties under the Internal Revenue Code or (ii) promoting, marketing or recommending to another party any transaction or matter addressed herein. The foregoing applies even if this notice is embedded in a message that is forwarded or attached. ***************************** _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
