I have recently built up a K1 to the point of the receiver alignment (page 36, 7 "Alignment and Test, Part 1"). Up until this point all of my test points have been successful, voltages correct, etc. When I power on the K1 I get the correct LED test pattern and then the E27/E42 error messages that are expected.
However, when I begin going through the steps on page 36 all is well until I get to the point on page 37 where I turn on the sidetone. I access the stl menu item, press-and-hold Menu and it comes up with 8 by default. I can tap up and down, exit the menu and go back in and the eeprom remembers my settings. I can turn the K1 off and back on, go back into the menus and access the stl menu and it remembered my setting. The only problem is I hear nothing, either on the headphone jack or on the external speaker connector. Everything else on the transceiver seems to function properly including turning on and off the attenuator, rit/xit, etc. Just no sound of any kind. Just for grins I went ahead and installed the filter board to test that portion of it and all of that worked perfectly. The relays switch bands and the display shows everything properly, no problems and of course with the filter board installed the E27 goes away. With the filter board installed, I still hear nothing when I access the stl menu to tap up or down the sidetone level. I also hear absolutely no hiss. Removing the filter board and powering back on I am back to the expected E27 and E42. It appears that everything else works completely as expected, considering the point at which I am in construction. The only issue is I have no audio which also means I hear no sidetone when I access the stl menu. I've spent many hours (roughly 7 as of this moment) going over both the top and bottom of the RF board with a magnifying glass looking at each and every connection and solder joint. I did go ahead and re-flow several that I thought maybe were suspect and re-soldered some others just to be safe. I paid special attention to the P1 connector and ensured each and every pin is well soldered. I then started working through the audio chain, starting from the front-panel and working my way to the RF board. I verified: 1. I hear sidetone on P1 pin 2 2. I hear sidetone on Q11 drain (I had heard that could be a known issue, but it wasn't) 3. I hear sidetone on U3 pin 5 4. I verified source and drain are not shorted on Q10 5. I verified source and drain are not open on Q11 It seems like audio is getting to the amp stages but the K1 is completely quiet (and I mean quiet, with absolutely none of the normal hiss you would expect to hear). I have absolutely nothing coming from the headphone jack or the external speaker connector. Any ideas on what/where else to check and see where my sound has gone? Now I am assuming, based on pages 36 and 37 of the manual, that I am at the point where when I access the stl menu that turns on sidetone and that I *should* be able to hear it. If that is correct, the K1 is completely silent. Thought I'd pull back and see if anyone else has had a similar issue or has some insight. Thanks. John -- View this message in context: http://elecraft.365791.n2.nabble.com/No-audio-tp7612519.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ 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 Message delivered to arch...@mail-archive.com
