My Z3801A began to die over the last few days. It would work for an hour or two then produce a receiver error and communications problems. Turn it off, let it sit awhile, back on and it would start the survey and then begin to recover. Tonight it finally went dead with high current on the main input . The feed supply has a 2amp current limit so I have not blown the two 3amp fuses I have a schematic of the supply reverse engineered by Stefan Hegnauere a few years ago (thank you very much) and a limited theory of operation description so I am not totally dead from a troubleshooting point of view although if one of the DC-DC converters is dead then I will likely have to scrap the supply Questions 1) Any prior experience as where to look first I checked the electrolytics and at first glance they seem fine, no loss of magic smoke or any parts obviously hot or bulging. ESR 's look good on those 2) Will this supply function unloaded while I troubleshoot it on the bench out of the unit? 3) Anyone tried independent powering the Z3801? looks like two 5V supplies and +/- 15V..not hard to to do 4) Anyone with a good supply from a parts unit want to part with same? Dave NR1DX ArtekManuals.com -- Dave Manuals@ArtekManuals.com www.ArtekManuals.com --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

power supply runs for a while, output current increases, but voltage stays correct -> problem is in the load circuit, load circuit working for a while load current increases, but it recovers after pause -> look for some tantalum capacitor in the load circuit, they recover often a few times before they finally die, KJ6UHN Alex On 1/30/2016 6:21 PM, Artek Manuals wrote: > My Z3801A began to die over the last few days. It would work for an > hour or two then produce a receiver error and communications problems. > Turn it off, let it sit awhile, back on and it would start the survey > and then begin to recover. Tonight it finally went dead with high > current on the main input . The feed supply has a 2amp current limit > so I have not blown the two 3amp fuses > > I have a schematic of the supply reverse engineered by Stefan > Hegnauere a few years ago (thank you very much) and a limited theory > of operation description so I am not totally dead from a > troubleshooting point of view although if one of the DC-DC converters > is dead then I will likely have to scrap the supply > > Questions > 1) Any prior experience as where to look first I checked the > electrolytics and at first glance they seem fine, no loss of magic > smoke or any parts obviously hot or bulging. ESR 's look good on those > 2) Will this supply function unloaded while I troubleshoot it on the > bench out of the unit? > 3) Anyone tried independent powering the Z3801? looks like two 5V > supplies and +/- 15V..not hard to to do > 4) Anyone with a good supply from a parts unit want to part with same? > > Dave > NR1DX > ArtekManuals.com >

As I mentioned in the another thread this week. You can indeed replace the failed voltage with just another inverter. Mine has run this way for 10 years. Mine was a 5 by the way. If it was one side of the +/-15 I would say you want to replace both. The entire switcher can be replaced with supplies that work off of 110 so you can get rid of the 48 volt supplies. Good luck Paul WB8TSL On Sun, Jan 31, 2016 at 12:04 AM, Alex Pummer <alex@pcscons.com> wrote: > power supply runs for a while, output current increases, but voltage stays > correct -> problem is in the load circuit, load circuit working for a while > load current increases, but it recovers after pause -> look for some > tantalum capacitor in the load circuit, they recover often a few times > before they finally die, > KJ6UHN > Alex > > On 1/30/2016 6:21 PM, Artek Manuals wrote: > >> My Z3801A began to die over the last few days. It would work for an hour >> or two then produce a receiver error and communications problems. Turn it >> off, let it sit awhile, back on and it would start the survey and then >> begin to recover. Tonight it finally went dead with high current on the >> main input . The feed supply has a 2amp current limit so I have not blown >> the two 3amp fuses >> >> I have a schematic of the supply reverse engineered by Stefan Hegnauere a >> few years ago (thank you very much) and a limited theory of operation >> description so I am not totally dead from a troubleshooting point of view >> although if one of the DC-DC converters is dead then I will likely have to >> scrap the supply >> >> Questions >> 1) Any prior experience as where to look first I checked the >> electrolytics and at first glance they seem fine, no loss of magic smoke or >> any parts obviously hot or bulging. ESR 's look good on those >> 2) Will this supply function unloaded while I troubleshoot it on the >> bench out of the unit? >> 3) Anyone tried independent powering the Z3801? looks like two 5V >> supplies and +/- 15V..not hard to to do >> 4) Anyone with a good supply from a parts unit want to part with same? >> >> Dave >> NR1DX >> ArtekManuals.com >> >> > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. >

Hi I had one that took out the internal fuse once every 3 to 5 years. After replacing the fuse 3 times, the supply died. Go figure … only 15 years or use. Bob > On Jan 31, 2016, at 9:11 AM, paul swed <paulswedb@gmail.com> wrote: > > As I mentioned in the another thread this week. > You can indeed replace the failed voltage with just another inverter. > Mine has run this way for 10 years. Mine was a 5 by the way. If it was one > side of the +/-15 I would say you want to replace both. > The entire switcher can be replaced with supplies that work off of 110 so > you can get rid of the 48 volt supplies. > Good luck > Paul > WB8TSL > > On Sun, Jan 31, 2016 at 12:04 AM, Alex Pummer <alex@pcscons.com> wrote: > >> power supply runs for a while, output current increases, but voltage stays >> correct -> problem is in the load circuit, load circuit working for a while >> load current increases, but it recovers after pause -> look for some >> tantalum capacitor in the load circuit, they recover often a few times >> before they finally die, >> KJ6UHN >> Alex >> >> On 1/30/2016 6:21 PM, Artek Manuals wrote: >> >>> My Z3801A began to die over the last few days. It would work for an hour >>> or two then produce a receiver error and communications problems. Turn it >>> off, let it sit awhile, back on and it would start the survey and then >>> begin to recover. Tonight it finally went dead with high current on the >>> main input . The feed supply has a 2amp current limit so I have not blown >>> the two 3amp fuses >>> >>> I have a schematic of the supply reverse engineered by Stefan Hegnauere a >>> few years ago (thank you very much) and a limited theory of operation >>> description so I am not totally dead from a troubleshooting point of view >>> although if one of the DC-DC converters is dead then I will likely have to >>> scrap the supply >>> >>> Questions >>> 1) Any prior experience as where to look first I checked the >>> electrolytics and at first glance they seem fine, no loss of magic smoke or >>> any parts obviously hot or bulging. ESR 's look good on those >>> 2) Will this supply function unloaded while I troubleshoot it on the >>> bench out of the unit? >>> 3) Anyone tried independent powering the Z3801? looks like two 5V >>> supplies and +/- 15V..not hard to to do >>> 4) Anyone with a good supply from a parts unit want to part with same? >>> >>> Dave >>> NR1DX >>> ArtekManuals.com >>> >>> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there.

A tant melted on one of my KS-246361 boxes (I guess they're a similar age, possibly even the same source). The only one so far to have trouble. It failed in such a way that it continued to smoke and load up the power supply, The current drawn from the no-name laptop power supply was still well within spec, at least by the time I post-mortem'ed it. But that melted too, and took out three levels of circuit breakers. The KS-24361 worked perfectly after replacing the cap. On Sun, Jan 31, 2016 at 4:42 PM, Bob Camp <kb8tq@n1k.org> wrote: > Hi > > I had one that took out the internal fuse once every 3 to 5 years. After > replacing the fuse 3 times, the supply died. Go figure … only 15 years or > use. > > Bob > > On Jan 31, 2016, at 9:11 AM, paul swed <paulswedb@gmail.com> wrote: > > > > As I mentioned in the another thread this week. > > You can indeed replace the failed voltage with just another inverter. > > Mine has run this way for 10 years. Mine was a 5 by the way. If it was > one > > side of the +/-15 I would say you want to replace both. > > The entire switcher can be replaced with supplies that work off of 110 so > > you can get rid of the 48 volt supplies. > > Good luck > > Paul > > WB8TSL > > > > On Sun, Jan 31, 2016 at 12:04 AM, Alex Pummer <alex@pcscons.com> wrote: > > > >> power supply runs for a while, output current increases, but voltage > stays > >> correct -> problem is in the load circuit, load circuit working for a > while > >> load current increases, but it recovers after pause -> look for some > >> tantalum capacitor in the load circuit, they recover often a few times > >> before they finally die, > >> KJ6UHN > >> Alex > >> > >> On 1/30/2016 6:21 PM, Artek Manuals wrote: > >> > >>> My Z3801A began to die over the last few days. It would work for an > hour > >>> or two then produce a receiver error and communications problems. Turn > it > >>> off, let it sit awhile, back on and it would start the survey and then > >>> begin to recover. Tonight it finally went dead with high current on the > >>> main input . The feed supply has a 2amp current limit so I have not > blown > >>> the two 3amp fuses > >>> > >>> I have a schematic of the supply reverse engineered by Stefan > Hegnauere a > >>> few years ago (thank you very much) and a limited theory of operation > >>> description so I am not totally dead from a troubleshooting point of > view > >>> although if one of the DC-DC converters is dead then I will likely > have to > >>> scrap the supply > >>> > >>> Questions > >>> 1) Any prior experience as where to look first I checked the > >>> electrolytics and at first glance they seem fine, no loss of magic > smoke or > >>> any parts obviously hot or bulging. ESR 's look good on those > >>> 2) Will this supply function unloaded while I troubleshoot it on the > >>> bench out of the unit? > >>> 3) Anyone tried independent powering the Z3801? looks like two 5V > >>> supplies and +/- 15V..not hard to to do > >>> 4) Anyone with a good supply from a parts unit want to part with same? > >>> > >>> Dave > >>> NR1DX > >>> ArtekManuals.com > >>> > >>> > >> _______________________________________________ > >> time-nuts mailing list -- time-nuts@febo.com > >> To unsubscribe, go to > >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >> and follow the instructions there. > >> > > _______________________________________________ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. >

I had the same thing happen on 1ks24361 Makes a nasty smell On Sunday, January 31, 2016, Adrian Godwin <artgodwin@gmail.com> wrote: > A tant melted on one of my KS-246361 boxes (I guess they're a similar age, > possibly even the same source). The only one so far to have trouble. It > failed in such a way that it continued to smoke and load up the power > supply, > > The current drawn from the no-name laptop power supply was still well > within spec, at least by the time I post-mortem'ed it. But that melted too, > and took out three levels of circuit breakers. The KS-24361 worked > perfectly after replacing the cap. > > > > > On Sun, Jan 31, 2016 at 4:42 PM, Bob Camp <kb8tq@n1k.org <javascript:;>> > wrote: > > > Hi > > > > I had one that took out the internal fuse once every 3 to 5 years. After > > replacing the fuse 3 times, the supply died. Go figure … only 15 years or > > use. > > > > Bob > > > On Jan 31, 2016, at 9:11 AM, paul swed <paulswedb@gmail.com > <javascript:;>> wrote: > > > > > > As I mentioned in the another thread this week. > > > You can indeed replace the failed voltage with just another inverter. > > > Mine has run this way for 10 years. Mine was a 5 by the way. If it was > > one > > > side of the +/-15 I would say you want to replace both. > > > The entire switcher can be replaced with supplies that work off of 110 > so > > > you can get rid of the 48 volt supplies. > > > Good luck > > > Paul > > > WB8TSL > > > > > > On Sun, Jan 31, 2016 at 12:04 AM, Alex Pummer <alex@pcscons.com > <javascript:;>> wrote: > > > > > >> power supply runs for a while, output current increases, but voltage > > stays > > >> correct -> problem is in the load circuit, load circuit working for a > > while > > >> load current increases, but it recovers after pause -> look for some > > >> tantalum capacitor in the load circuit, they recover often a few > times > > >> before they finally die, > > >> KJ6UHN > > >> Alex > > >> > > >> On 1/30/2016 6:21 PM, Artek Manuals wrote: > > >> > > >>> My Z3801A began to die over the last few days. It would work for an > > hour > > >>> or two then produce a receiver error and communications problems. > Turn > > it > > >>> off, let it sit awhile, back on and it would start the survey and > then > > >>> begin to recover. Tonight it finally went dead with high current on > the > > >>> main input . The feed supply has a 2amp current limit so I have not > > blown > > >>> the two 3amp fuses > > >>> > > >>> I have a schematic of the supply reverse engineered by Stefan > > Hegnauere a > > >>> few years ago (thank you very much) and a limited theory of operation > > >>> description so I am not totally dead from a troubleshooting point of > > view > > >>> although if one of the DC-DC converters is dead then I will likely > > have to > > >>> scrap the supply > > >>> > > >>> Questions > > >>> 1) Any prior experience as where to look first I checked the > > >>> electrolytics and at first glance they seem fine, no loss of magic > > smoke or > > >>> any parts obviously hot or bulging. ESR 's look good on those > > >>> 2) Will this supply function unloaded while I troubleshoot it on the > > >>> bench out of the unit? > > >>> 3) Anyone tried independent powering the Z3801? looks like two 5V > > >>> supplies and +/- 15V..not hard to to do > > >>> 4) Anyone with a good supply from a parts unit want to part with > same? > > >>> > > >>> Dave > > >>> NR1DX > > >>> ArtekManuals.com > > >>> > > >>> > > >> _______________________________________________ > > >> time-nuts mailing list -- time-nuts@febo.com <javascript:;> > > >> To unsubscribe, go to > > >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > >> and follow the instructions there. > > >> > > > _______________________________________________ > > > time-nuts mailing list -- time-nuts@febo.com <javascript:;> > > > To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > > and follow the instructions there. > > > > _______________________________________________ > > time-nuts mailing list -- time-nuts@febo.com <javascript:;> > > To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com <javascript:;> > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. >