[time-nuts] pts 160 power problem

[Dave Mallery]

thanks everyone.

i found a cache of tantalum caps in the output amp module.  also, there
isn't any output any more.
struggling to get all those @#@ screws out so i can get to them.

should i find new tantalum caps, or is there a better substitute?

dave

On Fri, Feb 25, 2011 at 11:29 AM, <GandalfG8 at aol.com> wrote:

>
> In a message dated 25/02/2011 17:13:01 GMT Standard Time,
> dave.mallery at gmail.com writes:
>
> i tried  another more robust 5v supply, but that goes to 4.5v and ng
> output.
>
> i  removed each of the plug-in decades, one at a time, looking for the
> guilty
> one.  no joy.  i also removed the left rear module (uses  5v).  the other
> two
> modules only use 12v. which is fine.
>
> has  anyone been here before?  could it be a problem in the backplane (a
> work
> of art, btw)?
>
>
>
> ---------------
> Hi Dave
>
>
> I've used quite a few of these and have never yet experienced an  actual
> component failure, obviously not saying it can't happen just that  once
> sorted
> yours should remain pretty reliable.
>
>
> As John already suggested I'd also look for possible fautly tantalums or
> other capacitors across the supply but would also suggest removing all the
> modules from the motherboard at the same time before proceeding any furter
> and checking if the symptoms still persist.
> I know what you've done has probably eliminated the modules but it  would
> be a shame to tear into the backplane if you just happened to have more
>  than
> one faulty module.
>
> I did once receive a previously working PTS160 by post that refused to play
>  and eventually located a very small solder blob, presumably  from inside
> the associated module, that had dropped into an edge  connector and wedged
> between a couple of pins, that was fun:-)
>
> If you haven't already found it there's a manual for the PT160 on Didier's
> site.........
>
> _http://www.ko4bb.com/cgi-bin/manuals.pl?dir=05%29_GPS_Timing/PTS_
> (http://www.ko4bb.com/cgi-bin/manuals.pl?dir=05)_GPS_Timing/PTS)
>
> regards
>
> Nigel
> GM8PZR
>
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-- 
Dave Mallery, K5EN                 (ubuntu linux 10.10)
HC31 Box 99E;                   Williamsburg,  NM  87942

no gates...
  no windows!
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      linux counter #64628 (since 1997)

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--PJ, May 2007