Wes, I just checked and KO4BB already has the power supply info.
http://www.ko4bb.com/manuals/index.php?dir=02_GPS_Timing/Z3801 Joe Gray W5JG On Thu, Feb 4, 2016 at 5:21 PM, paul swed <paulsw...@gmail.com> wrote: > Daves absolutely correct about working around bad supplies. > The reason for the preregulator is that it would allow the 3801 to meet > European ETSI dc voltage standards that goes up to 75VDC on the telco > battery bus. US can reach 56 VDC. > Anyhow if thats your only problem then you can solve the problem. > Regards > Paul > WB8TSL > > On Thu, Feb 4, 2016 at 1:39 PM, Artek Manuals <manu...@artekmanuals.com> > wrote: > >> Wes >> >> Some one reversed engineered the supply about 10 years ago and they posted >> the schematic on the WEB....The web link I have no longer works so I will >> email you the schematics of the supply direct. >> >> I will check to see if the files are not already up on KO4BB and if not I >> will post them up there for every one >> >> >> That being said while troubleshooting my own supply this week I have >> learned the following >> 1) The supply ( is not a switcher) can be troubleshot on the bench >> removed ( and unplugged from from the Z3801A. >> 2) The supply is basically A pre-regulator and two DC-DC converters.By >> cutting one trace you can separate the two and bypass the preregulator >> which seems to me to be overkill if you using a good regulated DC supply to >> feed the thing 36 or more volts into the DC/DC converters is fine >> 3) The smaller DC-DC converter supplies 5V only ( probably for the >> receiver ???) >> 4) The larger Lucent converter supplies =15V / -15V /+5V >> 5) all the DC-DC outputs can be supplied with separate DC supplies of good >> quality >> >> >> >> Dave >> NR1DX >> ArtekManuals.com >> >> >> >> >> >> >> On 2/4/2016 12:17 PM, Wes Atchison wrote: >> >>> My HPZ3801 has died. It appears the internal DC to DC converters have >>> died. >>> The fuses (4) I have found on the boards check good with an ohmmeter. I >>> have checked voltage on test points where labeled as a supply. No >>> voltages >>> present. Is there a schematic available somewhere? Has anyone repaired a >>> Z3801 with similar problems? >>> >>> Thanks for any help. >>> >>> >>> >>> 73, >>> >>> Wes >>> >>> WA5TKU >>> >>> _______________________________________________ >>> 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. >>> >>> >> >> -- >> Dave >> manu...@artekmanuals.com >> www.ArtekManuals.com >> >> --- >> This email has been checked for viruses by Avast antivirus software. >> https://www.avast.com/antivirus >> >> >> _______________________________________________ >> 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.