Interesting. I also have several buttons that don't work on my K3: band up mode up ant shift/lo/norm rate/lock NR
The radio is still usable, and I'm waiting for a break in the contests to send it in for repair. Dave Hachadorian, K6LL Yuma, AZ -------------------------------------------------- From: "Paul Ferguson" <p...@paulferguson.us> Sent: Saturday, April 17, 2010 7:28 PM To: <elecraft@mailman.qth.net> Subject: [Elecraft] K3 button problem question > Seven of my front panel buttons do not function on K3 #757. I > also used the > Switch Test to see that they give no scan codes. All other > buttons work OK. > > Looking at the the schematic for the "Front Panel - Switches" I > see these seven > buttons are all connected to the SCANADC0 line into U3. I took > off the front > panel and put an ohmmeter from ground to the SCANADC0 line, and > it gives a few > ohms. The other lines (SCANADC1-7) show as open. > > I looks like either U3, C30, or R27 is bad. Does anyone see any > other > possibilities? > > I don't relish replacing U3 since it is a 16-pin IC. Maybe some > Chip-Quik or > tiny cutters to snip the leads would ease the job. > > 73, > Paul > K5ESW > ______________________________________________________________ > 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 ______________________________________________________________ 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
