Corey welcome to the group. As i recall those clocks absolutely drifted like that. Regards Paul.
On Thu, Oct 3, 2019 at 1:02 AM Corey Sukalich <[email protected]> wrote: > Hi all, > > New to the list, but have known of its existence for a while as I know > others that have been subscribers. > > My question pertains to a timebase used in a Schulmerich carillon bell > tower system from the 1990’s. > > The Seiko Epson RTC-72421 Real Time Clock Module (4-bit) is used, but the > clock ends up walking to a noticeable degree (minutes) over a period of > months. Is this expected for the device in question, or could it possibly > have a defect? > > Datasheet available here: > https://support.epson.biz/td/api/doc_check.php?dl=brief_RTC-72421&lang=en > <https://support.epson.biz/td/api/doc_check.php?dl=brief_RTC-72421&lang=en> > > > From what I can tell it uses an internal oscillator, so it sounds like I > would need to find a drop-in replacement or build a module that will > replace it with a significantly better time standard. Any advice is > appreciated as to whether could be accomplished without too much trouble. > I’ve repaired a few of these systems over time and there are enough of them > still in the wild that it might be worth me fabricating a module for them. > > Also, on the off chance someone is versed in EPROM data recovery or knows > of a resource for it, I would appreciate that information as well. > > Regards, > Corey > N9WIV > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
