Zac, Check the voltage on U6 pin 17 while in the menu (at a time you say you can hear audio). If it goes to a higher voltage, then suspect the MCU itself, but if it stays at 0 volts, look for a short on the '/MUTE' signal line. I believe the only parts involved in this signal line are U6 pin 17, R17, C23 and the gates of Q6 and Q7.
Remove the MCU and look carefully to be certain pin 17 is properly seated on the socket - not sticking out or bent under. You do have the jumpers R18 and R19 in place on the Control Board do you not? Also look for unsoldered connector pins on the connectors vetween the control board, Front panel and the RF Board. I am mystified by your report that you hear audio when you have the ATU menu active - I have found occasions when something like that appeared to be the case, but an unsoldered connector was making contact when pressure was placed on the boards, like when you press the menu button - don't overlook things of that nature. The most likely problem is an unsoldered or poorly soldered connection. 73, Don W3FPR > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of Zac Brown > Sent: Sunday, July 17, 2005 6:03 PM > To: [EMAIL PROTECTED] > Cc: elecraft@mailman.qth.net > Subject: [Elecraft] K2 - No Audio Except during Menu - updated > > > Hello, > > After reading thru the troubleshooting section of the manual, I > reheated the solder joints at Q6 & Q7. Unfortunately, nothing > changed. It is as if the K2 is always muted, except when in menu > mode after "Atu" is selected. I read thru some of the previous > threads on the list related to K2s being stuck in mute. Checked > U6 pin 17 - it's stuck at 0 V. Not sure how to progress at this point. > > Zac > > _______________________________________________ > Elecraft mailing list > Post to: Elecraft@mailman.qth.net > 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 > -- > No virus found in this incoming message. > Checked by AVG Anti-Virus. > Version: 7.0.323 / Virus Database: 267.9.0/50 - Release Date: 7/16/2005 > -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.323 / Virus Database: 267.9.0/50 - Release Date: 7/16/2005 _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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
