Serial Number 2548. The current MCU I have is version 2.04P. (latest)
The unit I swapped in earlier was, I think 2.03. I don’t have it with me, and I’m not sure. > On Nov 18, 2021, at 5:14 PM, Don Wilhelm <d...@w3fpr.com> wrote: > > Bill, > > What is the level of the MCU (before you changed it), and what level did you > try putting in? > And what is the serial number of your K2? Those may help to solve the > problem. > > 73, > Don W3FPR > > On 11/18/2021 3:55 PM, Bill Coleman wrote: >> U6 is kinda expensive to just replace…. >> >> I do have an older revision of the firmware for U6. I did try before >> substituting the KPA100 U4, and it didn’t address the issue. >> >> I guess this will require more sleuthing. >> >>> On Nov 16, 2021, at 12:35 PM, Don Wilhelm <d...@w3fpr.com> wrote: >>> >>> Bill, >>> >>> Plug the ribbon cable in and do an end to end continuity test - KPA100 U4 >>> pin 12 to Control Board U6 pin 25, >>> And KPA100 U4 pin 11 to CB U6 pin 26. That will check the board wiring and >>> the ribbon cable. >>> >>> If all that is OK, try replacing CB U6. >>> >>> 73, >>> Don W3FPR >>> >>> On 11/15/2021 7:28 PM, Bill Coleman wrote: >>>> Well, I cut out the existing U4 MAX1406 chip on the KPA100 and soldered in >>>> a 16-pin socket. Putting in a new MAX1406 chip in the newly installed >>>> socket and … same problem as before. The radio does not respond to >>>> commands, pressing the PORT TEST does not result in any data output. >>>> >>>> I haven’t had a chance to put a scope on the pins yet to see what is >>>> happening. >>>> >>>> I do find it odd that the pulse trains were reaching the CPU earlier, but >>>> it was not acting on the commands. (eg RT1; would not turn on the RIT, >>>> RT0; would not turn off the RIT) >>>> >>>> Any suggestions or ideas on how to debug this further? >>>> >>>> >>>>> On Nov 5, 2021, at 3:10 PM, Bill Coleman <aa...@arrl.net> wrote: >>>>> >>>>> Yes, Vss Vdd and Vcc all look like appropriate values. >>>>> >>>>>> On Nov 4, 2021, at 3:47 PM, Don Wilhelm <d...@w3fpr.com> wrote: >>>>>> >>>>>> Bill, >>>>>> >>>>>> Make certain you have +12 volts on U4 pin 1 and +5 volts on U4 pin 16 >>>>>> and about -25 volts (-8 to -27 volts) on U4 pin 8. >>>>>> If those are correct, replace U4 and it should work) >>>>>> >>>>>> 73, >>>>>> Don W3FPR >>>>>> >>>>>> On 11/4/2021 3:29 PM, Bill Coleman wrote: >>>>>>> About 10 days ago, I was having trouble with the K2/100, as it was no >>>>>>> longer talking to WSJT-X correctly. I could get the audio running, but >>>>>>> it would never contact the radio. >>>>>>> >>>>>>> Trying to set up for CQ WW Phone, I had the same trouble with N1MM. >>>>>>> >>>>>>> Tried to use the PORT TEST feature by going to the SEC menu, selecting >>>>>>> PORT, going into EDIT, and pressing the DISPLAY button. It would say >>>>>>> TEST, but I’d see no characters transmitted. >>>>>>> >>>>>>> Since I use USB serial adapters, I tried two of them, to no avail. >>>>>>> Can’t get a peep out of the K2/100. >>>>>>> >>>>>>> Opening up the rig and digging out the scope, if I send characters on >>>>>>> the serial port, I see pulse trains on KPA100 U4 - the MAX1406 chip - >>>>>>> pin 11 (R3OUT). So, it would appear that characters are reaching the >>>>>>> main CPU. >>>>>>> >>>>>>> If I put the scope probe on pin 12 (T2IN), it remains locked on ground, >>>>>>> never moving, even when I do the PORT TEST. >>>>>>> >>>>>>> If I remove the P1 connector from the control board, and put the scope >>>>>>> probe on pin 1 of that connector, I DO see pulse trains from the PORT >>>>>>> TEST. This indicates to me that the CPU is OK, but something is wrong >>>>>>> at the MAX1406 chip in the KPA100. >>>>>>> >>>>>>> In addition to not getting a response from the K2, it doesn’t appear to >>>>>>> obey commands. If I send RT1; or XT1; it doesn’t turn RIT or XIT on. >>>>>>> >>>>>>> I tried using a different main CPU chip (I have one with older >>>>>>> firmware), but that doesn’t appear to make a difference. I’m wondering >>>>>>> if my problem is a blown MAX1406 chip. >>>>>>> >>>>>>> Any recommendations or advice? It’s a big pain to remove the KPA100 >>>>>>> board, so I want to make sure what I’m replacing before I go after it. >>>>>>> >>>>>>> >>>>>>> >>>>> Bill Coleman, AA4LR, PP-ASEL Mail: aa...@arrl.net >>>>> Web: http://boringhamradiopart.blogspot.com >>>>> Quote: "Not within a thousand years will man ever fly!" >>>>> -- Wilbur Wright, 1901 >>>>> >>>> Bill Coleman, AA4LR, PP-ASEL Mail: aa...@arrl.net >>>> Web: http://boringhamradiopart.blogspot.com >>>> Quote: "Not within a thousand years will man ever fly!" >>>> -- Wilbur Wright, 1901 >>>> >> Bill Coleman, AA4LR, PP-ASEL Mail: aa...@arrl.net >> Web: http://boringhamradiopart.blogspot.com >> Quote: "Not within a thousand years will man ever fly!" >> -- Wilbur Wright, 1901 >> > Bill Coleman, AA4LR, PP-ASEL Mail: aa...@arrl.net Web: http://boringhamradiopart.blogspot.com Quote: "Not within a thousand years will man ever fly!" -- Wilbur Wright, 1901 ______________________________________________________________ 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
