Have you checked/replaced the electrolytic caps ? I've had one fail as a short-circuit; coincidentally, that was in a Heathkit but it was a scope calibrator.
On Monday, January 18, 2021 at 7:01:09 PM UTC-8 martin martin wrote: > Hi have the same 6 digit Heathkit. I do have the complete schematic if > you need it. My issue (not solved yet) is the power transformer runs too > hot to touch. All my voltages are good and the clock still keeps time - I > built it back in '77 > > On Sunday, January 17, 2021 at 11:33:47 PM UTC-8 Dekatron42 wrote: > >> There is one MK5017 clock that uses PNP transistors in the book I scanned >> which you can download from here: >> https://groups.google.com/g/neonixie-l/c/Ov-mzZ_pDig/m/G95NMJPKBQAJ it >> doesn't seem to use SP352s but at least a Panaplex display. >> >> /Martin >> >> On Monday, 18 January 2021 at 04:59:28 UTC+1 N9KTW wrote: >> >>> Yes, thank you I have seen it. I am currently trying to make a >>> schematic of the power supply that is on the clock that I have. I have no >>> voltages higher than about 125 ish in the clock. The 15Volt for the chip >>> is derived from a zener on a 55 Volt line. Also Heath uses NPN >>> transistors , and my unit is using PNP's. I am going to look and see if I >>> have any other panaplex clock diagrams ....... >>> >>> Howard >>> >>> On Sunday, January 17, 2021 at 7:23:39 PM UTC-6 J Forbes wrote: >>> >>>> did you see this? >>>> >>>> http://www.decadecounter.com/vta/pdf/gc1092d_schematic.pdf >>>> >>>> >>>> On Sunday, January 17, 2021 at 3:35:14 PM UTC-7 N9KTW wrote: >>>> >>>>> Well I found another clock to work on, using SP352 displays........ It >>>>> is marked DIGITAL CONCEPTS CORP, EC102 electronic calendar clock. >>>>> >>>>> It uses 3 SP352's for a 6 digit display. A MOSTEK 5017BA chip to run >>>>> things. >>>>> >>>>> The display doesnt light up, at all. In attempting to check voltages, >>>>> I cannot find any above about 125 (this seems VERY low for the panaplex >>>>> displays) I have been told that this is similar to a HEATHKIT GC1092d. >>>>> >>>>> Anyone got any ideas, maybe a schematic for this guy????? >>>>> >>>>> T I A >>>>> >>>>> de Howard, N9KTW >>>>> >>>> -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/4d711596-0348-4b75-b301-38c87b467e80n%40googlegroups.com.
