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

Jeremy Nichols jn6wfo at gmail.com
Sat Apr 15 23:42:02 EDT 2017


Update: The 4011s arrived in good condition. The sockets arrived today 
(I ordered a whole bunch with various numbers of machined pins as Tom 
Miller recommended). All the sockets were of the "good" kind except for 
the 14-pin sockets, which were the cheap kind in accord with Murphy's 
Law. :-(

Pause while I get the right kind of 14-pin socket.

Jeremy

On 4/4/2017 11:52 AM, Jeremy Nichols wrote:
> 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 
> <mailto: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
>     <mailto:david.partridge at perdrix.co.uk>>
>     To: "'Discussion of precise time and frequency measurement'"
>     <time-nuts at febo.com <mailto: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
>     <mailto:time-nuts-bounces at febo.com>] On Behalf Of Jeremy
>     > Nichols
>     > Sent: 04 April 2017 00:44
>     > To: time-nuts at febo.com <mailto: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
>     <mailto: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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