Thanks Dave, I will open the 2 up and test with the multimeter when I get home from work. I'll report back with the voltage I see.
I do have a scope, but haven't used it much and never hooked it up to a radio this complex before. > On Aug 7, 2024, at 11:43 AM, Dave Van Wallaghen <d...@w8fgu.com> wrote: > > Bill, > > Don and Mike have you looking in the proper location on the Front Panel > Board. I suspect that the RIT/XIT pot does not work as well, but as you say, > you can't invoke RIT or XIT at this time to determine this. Something is not > allowing the /BANK2 signal to occur in order to scan those controls on the > right side. FP U3 P16 is where that signal originates. Maybe a cold solder > joint on U3 P16 or something shorting the /BANK2 path to a high voltage. > > If you have a scope, you could look at U3 P13 and see it being pulled down in > around 5us pulses as I am measuring here. If not, then you might try using a > DMM to measure that pin. I am seeing around 4.6v and it fluctuates. If it is > at the high 5v level, then it is not being pulled down by U3. Again, either > something keeping that line high or bad pin 13 on U3. > > 73, > Dave, W8FGU > > > > On 8/7/2024 11:45:30 AM, "William Santos via Elecraft" > <elecraft@mailman.qth.net <mailto:elecraft@mailman.qth.net>> wrote: > >> Hi Mike, >> >> Thanks for your response and attention to my issue. >> >> Yes, it is only the buttons to the right of the LCD that are affected. >> >> All of the pots to the left of the VFO knob work properly, as do all the >> push buttons on the left (BAND+ through NB). To the right of the LCD, I can >> only confirm the MODE(1) and ON/OFF buttons work. Buttons A/B(2) through >> MSG(9) do not elicit a response. Unable to test the -1 0 +1 potentiometer, >> as I think all of it's functions require actuating one of the buttons on the >> keypad. >> >> To summarize, buttons 2 through 9 on the keypad are nonfunctional, and >> everything else seems to work. >> >> Thanks and 73, >> Bill >> KN6UDK >> >>> On Aug 7, 2024, at 8:23 AM, Michael Carter via Elecraft >>> <elecraft@mailman.qth.net <mailto:elecraft@mailman.qth.net>> wrote: >>> >>> Hi again, Bill, >>> >>> I re-read your post and realized that >>> it's only the buttons to the right side >>> of the LCD display that fail to function >>> (with the exception of the MODE button). >>> Is that correct? >>> >>> If so, I will retract my statement about >>> the parallel load shift register not working >>> properly. If it works for the buttons to the >>> left of the LCD display, then the shift >>> register is working OK. It would then >>> seem that the BANK2 switches to the >>> right of the display are not being polled. >>> The /BANK2 signal that polls these >>> switches is generated in U3, a 6B595 >>> shift register. That shift register >>> receives data serially from the MCU >>> and produces the /BANK1 and /BANK2 >>> signals that activate each switch >>> bank in turn. U3 also generates the >>> /ENC_RD signal that allows the >>> main tuning knob to be read. >>> >>> Please confirm which controls do >>> register any response, including >>> the 4 potentiometers to the >>> left of tuning knob. >>> >>> Thanks, and 73, >>> Mike, K8CN >>> ______________________________________________________________ >>> 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 <http://www.qsl.net/> >>> Please help support this email list: http://www.qsl.net/donate.html >>> Message delivered to san...@mac.com <mailto:san...@mac.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 <http://www.qsl.net/> >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to d...@w8fgu.com <mailto:d...@w8fgu.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
