[time-nuts] pts 160 power problem

[Bob Camp]

Hi

Far easier to simply replace them with modern tantalum parts than to try to find something else. Modern parts are likely to run a very long time. 

Bob


On Feb 25, 2011, at 6:24 PM, Dave Mallery wrote:

> 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
> 
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