On Thu, Nov 22, 2012 at 10:49 AM, Gene Heskett <[email protected]> wrote: > On Thursday 22 November 2012 10:42:35 Mark Wendt did opine: > >> On Thu, Nov 22, 2012 at 8:23 AM, Dave Caroline >> >> <[email protected]> wrote: >> > On Thu, Nov 22, 2012 at 1:13 PM, Mark Wendt <[email protected]> > wrote: >> >> I've got a Hakko 472 that "Just Works" tm. However, it has one >> >> little really annoying trait. The transformer "moans." By that, I >> >> mean, it doesn't have a steady hum, but more of a "waaaa, waaaa" in >> >> deep bass. ;-) >> >> >> >> Would I be looking in the right direction were I to assume one or >> >> more of the filter caps is starting to go? If not that, anything >> >> else I should look for? No schematics of the board, so I'm shooting >> >> a bit in the dark here. >> > >> > Look for loose laminations on the transformer >> > >> > Dave Caroline >> >> Okey doke. Will do. >> >> If they're lose, what methods do y'all suggest for "snugging" them >> back up? Varnish? Epoxy? >> >> Mark > > Most 'epoxy's today are way too fast acting, and won't sink into the > lamination gaps fast enough to fill them before it sets. I'd try a slow > 'spar' varnish & give it a week (or more) to wick in and cure before > applying power again. The superglue's wick well unless 'gel' but they have > a relatively poor survival compared to well cured varnish if the core gets > too hot. > > Cheers, Gene
I've got some laminating epoxy that requires well over 24 hours to cure, and has a pot life of about three hours at room temp. I suppose I could thin the epoxy with a bit of either DNA or acetone to allow it to wick further, but the that epoxy consistency is right about the same as a good, thick cuppa hot chocolate, so it should be able to penetrate fairly well. On the other hand, I use true spar varnish all the time when I finish the bamboo fly rods I make. And I have a bunch of that laying around. Thanks! Mark ------------------------------------------------------------------------------ Monitor your physical, virtual and cloud infrastructure from a single web console. Get in-depth insight into apps, servers, databases, vmware, SAP, cloud infrastructure, etc. Download 30-day Free Trial. Pricing starts from $795 for 25 servers or applications! http://p.sf.net/sfu/zoho_dev2dev_nov _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
