[time-nuts] HP-59309A Clock counts only seconds

[Jeremy Nichols]

Thanks, everyone, for your inputs. I've ordered some NOS 4011s (made by
National Semi, mildly ironic since I used to work there) and some
supposedly round pin sockets (the reviews were mixed—some folks got good
stuff, some got junk).

I'll update the thread once I have everything here and installed.

Jeremy


On Mon, Apr 3, 2017 at 11:01 PM Tom Miller <tmiller11147 at verizon.net> wrote:

> Also, you might install a high quality machined pin socket. Save the
> non-replaceable PC board.
>
> ----- Original Message -----
> From: "David C. Partridge" <david.partridge at perdrix.co.uk>
> To: "'Discussion of precise time and frequency measurement'"
> <time-nuts at febo.com>
> Sent: Monday, April 03, 2017 9:33 PM
> Subject: Re: [time-nuts] HP-59309A Clock counts only seconds
>
>
> > You can get a brand new CD4011BE from pretty much most suppliers at about
> > 15 cents that won't exhibit the problems of the earlier ones.
> >
> > Dave
> >
> > -----Original Message-----
> > From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of Jeremy
> > Nichols
> > Sent: 04 April 2017 00:44
> > To: time-nuts at febo.com
> > Subject: [time-nuts] HP-59309A Clock counts only seconds
> >
> > I have a new-to-me HP-59309A HP-IB Digital Clock. The clock works on both
> > the internal crystal oscillator and on an external 10 MHz standard
> > (GPSDO). However, it counts only to 60 seconds and then repeats without
> > updating the minutes digit. The TIME SET (FAST and SLOW) push-buttons
> work
> > but again, the count will not update minutes and hours, only seconds. The
> > DAY SET procedure works correctly for days and months. All the other
> > switches and buttons do what they are supposed to do. Using my 10526T
> > logic pulser I can force the minutes and hours counters to work.
> > The power supply is in good condition (after replacement of a few
> > components) and I see no other problems (yet).
> >
> > Tracing the clock signal through the logic circuitry brought me to U3 on
> > the A4 board. This (U3) is a 4011 quad 2-input NAND gate in a 14-pin DIP
> > package. It "connects" the seconds counter to the minutes counter and
> > appears to have failed. One of the people on the email list
> > <hp_agilent_equipment at yahoogroups.com> commented that the 4000 series
> CMOS
> > chips have a known limited lifetime. Since these parts are no longer in
> > production, the writer expressed the concern that any parts I might find
> > to buy may be DOA.
> >
> > Before I go hunting for parts, I'd appreciate hearing from anyone in the
> > group who has experience with the 59309A Clock and/or the 4000-series
> CMOS
> > family. In particular, are there modern equivalents to my 4011 chip? If
> > the 4000's really do have a limited lifetime I'd rather use a substitute.
> >
> > Jeremy, N6WFO
> >
> >
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