Wow Christopher, Thank You! I'm blown away by your kindness! I will get two sets of these caps ordered on Monday and see if I can get these two 3456's back in operation. Thanks again!
Dave - W6TE > Date: Sat, 27 Dec 2014 15:08:04 -0900 > From: [email protected] > To: [email protected] > Subject: Re: [volt-nuts] HP 3456A -3 Fault > > > First suspect is always the small electrolytics on A10, followed by the > large one on A10, and large one on A3, but those last 2 are large/high > qual and seem to last much better. > > > All 6 of my 3456As had or developed issues with one or more of the small > caps. > > All 6 have been re-capped with > > <part id> > <original P/N and spec> > <replacement P/N> > > A10C7 > 0180-3009 47uf ±20 50vdc Al > Nichicon UPM1J680MPD6 > > A10C8 > 0180-2803 100uf +50/-10 50vdc Al > Nichicon UPM1J331MHD6 > > A10C13/A10C15 > 0180-2635 1000uf +50/-10 35vdc Al > Nichicon UPM1V152MHD6 > > A10C16 > 0180-3014 330uf ±20 50vdc Al > Nichicon UPM1J391MHD6 > > A10C19 > 0180-3008 470uf +50/-10 35vdc Al > Nichicon UPM1V681MHD6 > > > These are all direct match for lead spacing/etc except C8, where the > replacement is wider leads _but_ has a thick slotted base so you can > dog-leg the leads to match the original spacing. > > All are long-life ± 20% parts, all are larger but fall within the > original range spec except C8, where going from 150uf (originally > selected part) to 330uf reduced p-p ripple from .45v to < .2v > > > DO check voltage and ripple, but if it comes down to it, the re-cap > takes about 20 minutes, including removing A10, pre and post recap > cleaning and re-install. > > > On 12/26/14, 14:34, David Smith wrote: > > Hello Friends, > > I have two HP 3456A's that have the same "-3" fault in the "test" mode. > > Both DVM's started exhibiting this same fault about the same time. I've > > troubleshot one of the DVM's to a failure in the Isolation Logic > > "Transmitter." I have no waveform at the output of A3T1. > > Before I continue with troubleshooting I thought I'd ask a question of the > > group. Is there a common mode failure of these DVM? Is there something in > > particular or area that I should be looking at/for? > > It's probably coincidental that they would both fail at about the same time > > with the same -3 fault. > > Your input is greatly appreciated. > > Best regards, > > > > Dave - W6TE > > _______________________________________________ > > volt-nuts mailing list -- [email protected] > > To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > > and follow the instructions there. > > > _______________________________________________ > volt-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there. _______________________________________________ volt-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
