I took the front panel and control boards off the RF board and reassembled them....the intermittent lack of response to tuning knob returned after a couple of minutes.
So I tried Don's first couple of steps (reflowing solder on encoder lead and front panel board U3) and that seems to have done the trick. Thanks, Don!
Just before I did this I also noted that when the tuning was not working the ENC A (or B, I didn't note which) was at a constant 4.3 V instead of switching between 5 V and something below 1 V as the tuning knob was turned, and that the overall power supply current dropped either 20 or 40 mA from the normal value. I am not sure quite what wasn't getting current but the solder reflow seems to have stopped it from happening.
Now if only I had gotten to this before last weekend's contest!
73,
Steve VE3SMA
______________________________________________________________
Elecraft mailing list
Home:
http://mailman.qth.net/mailman/listinfo/elecraftHelp:
http://mailman.qth.net/mmfaq.htmPost: mailto:
[hidden email]
This list hosted by:
http://www.qsl.netPlease help support this email list:
http://www.qsl.net/donate.htmlMessage delivered to
[hidden email]
Locked
