[time-nuts] Odetics 425 getting truly flaky...

paul swed paulswedb at gmail.com
Fri Jan 15 01:05:25 UTC 2010


Very very good advice always.
As I repair the -15 v supply in a hp 5248 counter.
Its running now after 3 semiconductors. Hey 1967 stuff doesn't last forever
even though its just sand.

On Thu, Jan 14, 2010 at 6:30 PM, Bruce Lane <kyrrin at bluefeathertech.com>wrote:

>        (hitting self on head)
>
>        Good Lord... John, good point! I should have done that first thing!
> The
> power supply in there is the original SMPS which came with the unit out
> of the factory.
>
>        I will check it before I start ordering sockets.
>
>        Thanks!
>
> *********** REPLY SEPARATOR  ***********
>
> On 14-Jan-10 at 15:13 J. Forster wrote:
>
> >Have you checked to power supplies for ripple or bad C's?
> >
> >-John
> >
> >===============
> >
> >
> >
> >> Fellow time-techs,
> >>
> >>      Nothing lasts forever, and my faithful Odetics 425 is doing its
> best
> to
> >> demonstrate that fact. Before I put "Fix or Replace the thing" on my
> >> project list for the new year, I thought I'd check to see if any other
> >> owners of the beasties have run into the symptoms I'm getting.
> >>
> >>      Specifically: The unit will go from TIME LOCKED and TFOM=4 to TIME
> >> COASTING and TFOM=5, pretty much at random.
> >>
> >>      What I've done: Reseat every IC the thing has, replaced a couple of
> >> interconnect cable DIP sockets with hi-rel machine-pin style (they
> were
> >> cheapie single-leaf before), and done a manual recalibration of the
> >> oscillator.
> >>
> >>      I know for a fact that the single-leaf IC sockets are a huge source
> of
> >> problems in older gear. My next step would be, I'm thinking, to
> replace
> >> every single IC socket with a high-rel part (that's a LOT of
> >> desoldering!)
> >>
> >>      So -- Any thoughts before I start ordering new chip sockets? ;-)
> >>
> >>      Thanks.
> >> Bruce Lane, Owner & Head Hardware Heavy,
> >> Blue Feather Technologies (http://www.bluefeathertech.com)
> >> Assoc. member, AZA & AAZK for many moons.
> >> "Salvadore Dali's computer has surreal ports..."
> >>
> >>
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> >>
> >>
> >
> >
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