After removing endless hex screws to get at the insides I find the 24V/2A PSU that supplies the standby voltages has what appears to be a transformer primary short. Problem is, one has to remove the input board to get at the PSU screws. Sounds easy when put like that... I'll take some pix to show why I am so terrified of this input board.
Looking at Eds teardown on http://www.eevblog.com/forum/testgear/wavecrest-dts-2077-teardown/?action=dlattach;attach=58083 Ed has a single standby switch mode - the small silver slotted box with the yellow wires. Mine is ancient and has 2 linear PSU, but hey, it's got the yellow wires! Anyway I have, used my post quota for the day - nite.. Oh before I go, luckily I checked, yes all the PSU (in this model) need strapping for utilised input voltage. I found a couple of "expanded/exploded" surface mount electro (tantalum?) caps on the filter board between the switch mode frame and the card cage. I have not a clue what that means.. --marki -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Mark C. Stephens Sent: Monday, 9 September 2013 6:31 PM To: Bob Stewart; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Wavecrest DTS 2070 I pried open the fuse compartment. Both fuses black. Black as in dead short black. Not good. Short circuit on mains input. Open case. big thick wire carry mains to solid state relay then off to switch mode modules. Relay cannot be short between supplies. Must be one or more PSU with chopper or bridge short. Marki will have to be careful. Expensive and dangerous equipment at stake. -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Stewart Sent: Monday, 9 September 2013 2:22 PM To: Bob Stewart; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Wavecrest DTS 2070 Oops. Maybe I should have just kept my peace. I found a User's Guide here: "http://qmsi.com/pics/Wavecrest2070.a.pdf"; which indicates it can take either 110 or 220. Pry open the fuse compartment and see what's in there. Someone else will now probably post the right way to go about it, though. =) Bob - AE6RV >________________________________ > From: Bob Stewart <b...@evoria.net> >To: Discussion of precise time and frequency measurement ><time-nuts@febo.com> >Sent: Sunday, September 8, 2013 11:13 PM >Subject: Re: [time-nuts] Wavecrest DTS 2070 > > >Go to a tourist supply store and buy a 110 to 230/250 transformer. I did that >the year I spent in France for a TV or something we took over there. Be sure >you get one that's big enough. Be sure you don't wire it backwards and get >250 to 500!!! > >Bob - AE6RV > > > > > >>________________________________ >> From: Mark C. Stephens <ma...@non-stop.com.au> >>To: "time-nuts@febo.com" <time-nuts@febo.com> >>Sent: Sunday, September 8, 2013 11:05 PM >>Subject: [time-nuts] Wavecrest DTS 2070 >> >> >>I just received my DTS 2070 from 110 volt land. >>I live in 230 (well actually 250) volt land. >> >>I haven't plugged it in and I am being a total wuss about breaking the CAL >>seals as they are still current. >> >>Please help me, I really, really need to measure something with it! Anything >>with it! But to do that I need to apply power! >> >>Is the DTS 2070 PSU auto sensing or do I need to change something? >> >> >>--marki >>_______________________________________________ >>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. _______________________________________________ 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.
