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 <[EMAIL PROTECTED]> > Subject: Re: [time-nuts] 5062C power supply problem > To: [email protected] > Message-ID: <[EMAIL PROTECTED]> > 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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