Re: [Elecraft] [K2] K2/100 - Serial Port Quit Working
Bill, That was why Elecraft released MCU 2.04r which is exactly the same as 2.04P, but the sidetone source is locked at U8-4. That can happen if someone EDITs the ST-L menu and then taps the DISPLAY button without exiting the menu first. Many hours of support time had been spent on the "I lost the sidetone" problem - so 2.04r was the solution to that problem. 73, Don W3FPR On 11/19/2021 1:37 PM, Bill Coleman wrote: Alright, I have figured this out. I’m not sure why I was seeing Vss of -5 volts. I re-checked the negative supply on the KPA100, flowed the solder on D7 and D8. After that, I was seeing almost -24 volts at the Vss pin, without U4 in place. With U4 connected and everything hooked up, Vss was more like -15 volts. I’m not sure what was causing it to read -5 volts. However, even with all that, it still wasn’t working! I could see the RS-232 data get all the way to the MCU - Control Board U6, pin 26 using the scope, but the K2 would not react to any commands. Also, when using the PORT TEST action on the menu, I saw no data on U6 pin 25. But, then I figured it out. I remembered that the K2 has a setting which changes the origin of the sidetone. Modern K2’s use U8-4 as a default, although early K2s used U6-25 as the default value, as that was the way the sidetone was originally wired. I wondered if something had happened and this setting had somehow gotten switched. Sure enough, I found it was set to U6-25. Changing this to the proper value of U8-4, and the serial port operation was completely restored. I’m not sure how this value got changed. It could have happened if the DISPLAY button had been pressed when the ST L menu was in edit mode. Since ST L is the default, if the user accidentally held the MENU button too long, and then immediately tapped DISPLAY, that would have done it. Sorry for all the trouble. It really is amazing that something so simple could cause so much bother. On Nov 19, 2021, at 12:01 PM, Bill Coleman wrote: Don, Managed to do a little diagnosis. I pulled the MAX1406 chip KPA100 U4. I see proper continuity between pin 12 of U4 and pin 25 of the MCU, and pin 11 of U4 and pin 26 of the MCU. Going back, I checked out the Vdd, Vss an Vcc voltages on U4. Vdd is 14 volts Vcc is 5 volts Vss is -5 volts It looks like, from the specification of the MAX1406 chip, it needs more like -10 volts to work correctly. I measured these on the scope before, so I only got vague responses. I guess I’ll be investigating the Vss supply. On Nov 19, 2021, at 11:25 AM, Bill Coleman wrote: 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 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 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 wrote: Yes, Vss Vdd and Vcc all look like appropriate values. On Nov 4, 2021, at 3:47 PM, Don Wilhelm 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
Re: [Elecraft] [K2] K2/100 - Serial Port Quit Working
Bill, In the KPA100, the normal Vss is about -25 volts, so suspect that something may be loading that negative supply. Pull U4 out and measure that voltage again. If it is still not negative enough, you may have a problem in the T/R switch. Check for 90 to 150 volts on the highest voltage end of R11. If that voltage is OK, look carefully at C34, C35, D7 and D8. Put MCU 2.04P back in - it won't help with this problem, but there are other things it will help with. 73, Don W3FPR On 11/19/2021 12:01 PM, Bill Coleman wrote: Don, Managed to do a little diagnosis. I pulled the MAX1406 chip KPA100 U4. I see proper continuity between pin 12 of U4 and pin 25 of the MCU, and pin 11 of U4 and pin 26 of the MCU. Going back, I checked out the Vdd, Vss an Vcc voltages on U4. Vdd is 14 volts Vcc is 5 volts Vss is -5 volts It looks like, from the specification of the MAX1406 chip, it needs more like -10 volts to work correctly. I measured these on the scope before, so I only got vague responses. I guess I’ll be investigating the Vss supply. On Nov 19, 2021, at 11:25 AM, Bill Coleman wrote: 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. __ 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
Re: [Elecraft] [K2] K2/100 - Serial Port Quit Working
Alright, I have figured this out. I’m not sure why I was seeing Vss of -5 volts. I re-checked the negative supply on the KPA100, flowed the solder on D7 and D8. After that, I was seeing almost -24 volts at the Vss pin, without U4 in place. With U4 connected and everything hooked up, Vss was more like -15 volts. I’m not sure what was causing it to read -5 volts. However, even with all that, it still wasn’t working! I could see the RS-232 data get all the way to the MCU - Control Board U6, pin 26 using the scope, but the K2 would not react to any commands. Also, when using the PORT TEST action on the menu, I saw no data on U6 pin 25. But, then I figured it out. I remembered that the K2 has a setting which changes the origin of the sidetone. Modern K2’s use U8-4 as a default, although early K2s used U6-25 as the default value, as that was the way the sidetone was originally wired. I wondered if something had happened and this setting had somehow gotten switched. Sure enough, I found it was set to U6-25. Changing this to the proper value of U8-4, and the serial port operation was completely restored. I’m not sure how this value got changed. It could have happened if the DISPLAY button had been pressed when the ST L menu was in edit mode. Since ST L is the default, if the user accidentally held the MENU button too long, and then immediately tapped DISPLAY, that would have done it. Sorry for all the trouble. It really is amazing that something so simple could cause so much bother. > On Nov 19, 2021, at 12:01 PM, Bill Coleman wrote: > > Don, > > Managed to do a little diagnosis. > > I pulled the MAX1406 chip KPA100 U4. > > I see proper continuity between pin 12 of U4 and pin 25 of the MCU, and pin > 11 of U4 and pin 26 of the MCU. > > Going back, I checked out the Vdd, Vss an Vcc voltages on U4. > > Vdd is 14 volts > Vcc is 5 volts > Vss is -5 volts > > It looks like, from the specification of the MAX1406 chip, it needs more like > -10 volts to work correctly. > > I measured these on the scope before, so I only got vague responses. > > I guess I’ll be investigating the Vss supply. > >> On Nov 19, 2021, at 11:25 AM, Bill Coleman wrote: >> >> 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 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 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 wrote: >>> >>> Yes, Vss Vdd and Vcc all look like appropriate values. >>> On Nov 4, 2021, at 3:47 PM, Don Wilhelm 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. >
Re: [Elecraft] [K2] K2/100 - Serial Port Quit Working
Don, Managed to do a little diagnosis. I pulled the MAX1406 chip KPA100 U4. I see proper continuity between pin 12 of U4 and pin 25 of the MCU, and pin 11 of U4 and pin 26 of the MCU. Going back, I checked out the Vdd, Vss an Vcc voltages on U4. Vdd is 14 volts Vcc is 5 volts Vss is -5 volts It looks like, from the specification of the MAX1406 chip, it needs more like -10 volts to work correctly. I measured these on the scope before, so I only got vague responses. I guess I’ll be investigating the Vss supply. > On Nov 19, 2021, at 11:25 AM, Bill Coleman wrote: > > 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 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 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 wrote: >> >> Yes, Vss Vdd and Vcc all look like appropriate values. >> >>> On Nov 4, 2021, at 3:47 PM, Don Wilhelm 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-ASELMail: aa...@arrl.net >>
Re: [Elecraft] [K2] K2/100 - Serial Port Quit Working
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 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 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 wrote: > > Yes, Vss Vdd and Vcc all look like appropriate values. > >> On Nov 4, 2021, at 3:47 PM, Don Wilhelm 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-ASELMail: 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-ASELMail: 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-ASELMail: 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-ASELMail: aa...@arrl.net Web: http://boringhamradiopart.blogspot.com Quote: "Not within a
Re: [Elecraft] [K2] K2/100 - Serial Port Quit Working
Exactly, working one day with WSJT-X, next day, not. > On Nov 18, 2021, at 5:10 PM, Don Wilhelm wrote: > > Matt, > > I Forgot to mention that to Bill. The special cable does not have to be very > long, but it must be present. Only pins 2, 3 and 5 should connect to the > RS232 connector on the USB to serial adapter. Failure to follow this will > cause several "strange happenings" with the K2. The subject line said it > "quit working", so I assumed it had worked just before it quit. > > 73, > Don W3FPR > > On 11/18/2021 4:14 PM, Matt Maguire wrote: >> Don’t forget, you can’t plug in a USB adapter directly into a K2, as the >> wiring is not standard RS232C. You need to make up a special adapter as >> described in the manual. Probably you know this already, but just something >> else to check. >> >> 73, Matt VK2RQ >> >> On Fri, 5 Nov 2021 at 06:31, 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. >>> the man eis >>> 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-ASELMail: 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 matt.vk...@gmail.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 d...@w3fpr.com > Bill Coleman, AA4LR, PP-ASELMail: 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
Re: [Elecraft] [K2] K2/100 - Serial Port Quit Working
Yes, I know. I’ve been using the cable that I built back in 2002, when I added the KPA100, and later modified when I added the KAT100. > On Nov 18, 2021, at 4:14 PM, Matt Maguire wrote: > > Don’t forget, you can’t plug in a USB adapter directly into a K2, as the > wiring is not standard RS232C. You need to make up a special adapter as > described in the manual. Probably you know this already, but just something > else to check. > > 73, Matt VK2RQ > > On Fri, 5 Nov 2021 at 06:31, 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. > the man eis > 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-ASELMail: 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 matt.vk...@gmail.com Bill Coleman, AA4LR, PP-ASELMail: 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
Re: [Elecraft] [K2] K2/100 - Serial Port Quit Working
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 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 wrote: Yes, Vss Vdd and Vcc all look like appropriate values. On Nov 4, 2021, at 3:47 PM, Don Wilhelm 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-ASELMail: 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-ASELMail: 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-ASELMail: 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
Re: [Elecraft] [K2] K2/100 - Serial Port Quit Working
Matt, I Forgot to mention that to Bill. The special cable does not have to be very long, but it must be present. Only pins 2, 3 and 5 should connect to the RS232 connector on the USB to serial adapter. Failure to follow this will cause several "strange happenings" with the K2. The subject line said it "quit working", so I assumed it had worked just before it quit. 73, Don W3FPR On 11/18/2021 4:14 PM, Matt Maguire wrote: Don’t forget, you can’t plug in a USB adapter directly into a K2, as the wiring is not standard RS232C. You need to make up a special adapter as described in the manual. Probably you know this already, but just something else to check. 73, Matt VK2RQ On Fri, 5 Nov 2021 at 06:31, 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. the man eis 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-ASELMail: 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 matt.vk...@gmail.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 d...@w3fpr.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
Re: [Elecraft] [K2] K2/100 - Serial Port Quit Working
Don’t forget, you can’t plug in a USB adapter directly into a K2, as the wiring is not standard RS232C. You need to make up a special adapter as described in the manual. Probably you know this already, but just something else to check. 73, Matt VK2RQ On Fri, 5 Nov 2021 at 06:31, 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. > the man eis > 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-ASELMail: 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 matt.vk...@gmail.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
Re: [Elecraft] [K2] K2/100 - Serial Port Quit Working
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 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 wrote: >>> >>> Yes, Vss Vdd and Vcc all look like appropriate values. >>> On Nov 4, 2021, at 3:47 PM, Don Wilhelm 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-ASELMail: 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-ASELMail: 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-ASELMail: 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
Re: [Elecraft] [K2] K2/100 - Serial Port Quit Working
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 wrote: Yes, Vss Vdd and Vcc all look like appropriate values. On Nov 4, 2021, at 3:47 PM, Don Wilhelm 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-ASELMail: 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-ASELMail: 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
Re: [Elecraft] [K2] K2/100 - Serial Port Quit Working
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 wrote: > > Yes, Vss Vdd and Vcc all look like appropriate values. > >> On Nov 4, 2021, at 3:47 PM, Don Wilhelm 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-ASELMail: 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-ASELMail: 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
Re: [Elecraft] [K2] K2/100 - Serial Port Quit Working
Yes, Vss Vdd and Vcc all look like appropriate values. > On Nov 4, 2021, at 3:47 PM, Don Wilhelm 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-ASELMail: 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
Re: [Elecraft] [K2] K2/100 - Serial Port Quit Working
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. __ 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
[Elecraft] [K2] K2/100 - Serial Port Quit Working
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-ASELMail: 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
