[time-nuts] time-nuts Digest, Vol 49, Issue 50

Tim Schulz technoid_tim at comcast.net
Tue Aug 19 19:17:14 EDT 2008


Hi Corby - Thank you for the very helpful information.  This 5062C had 
been operational for me for about 8 months before it died.  It would 
occasionally loose it's green light, but when I went through the meter 
readings, I thought everything was nominal according to penciled in 
figures.  It will be about a week before I can get back to it, but at 
least I have plenty of things to try.
regards, tim
> Date: Tue, 19 Aug 2008 14:09:21 -0700
> From: corby d dawson <cdelect at juno.com>
> Subject: Re: [time-nuts] 5062C power supply problem
> To: time-nuts at febo.com
> Message-ID: <20080819.140923.-558537.5.cdelect at juno.com>
> Content-Type: text/plain; charset=us-ascii
>
> Tim,
>
> You need to make sure the ion pump current has dropped to <10 on the
> meter or else the +18V supply is disabled.
>
> If it is high watch the 18 volt meter position and momentarily remove the
> A7 high voltage by pulling out the HV connector.
>
> If the +18 comes up then reconnect the HV and let the unit run a couple
> days.
>
> Hopefully you should see the ion pump current slowly drop, when it falls
> below the trip point the CS oven and +18V will come on and the ion pump
> reading will rise again, possibly pegging.
>
> This is normal for a unit that has been off for a long while. It can take
> a couple days of cycling to finally drop and stay below the trip point.
>
> If the +18 is indeed dead then you can hook an external +18V @ 1.5A
> between chassis ground and one of the marked +18V runs.
>
> Current draw is about 1.3A.
>
> This is just for momentary testing as the ion pump interlock will be
> bypassed. If you are patient you can apply the +18V, watch the ion pump
> peg, remove the +18V, wait till the ion pump drops below 10, and repeat
> until you can leave the +18V connected and the ion pump is 10 or below.
>
> I have done this while working on these units and also have replaced the
> +18V card with  a DC to DC module that has remote gate capability so that
> the ion pump circuit will work with it.
>
> Hope this helps,
>
> Corby Dawson
>   




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