On Thu, Nov 22, 2012 at 10:41 AM, Gene Heskett <[email protected]> wrote: > On Thursday 22 November 2012 10:37:48 Mark Wendt did opine: > >> 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. >> >> Thanks, >> Mark > > I think I have essentially the same thing, built in hot air pump too? > > What you may be hearing is the pwm beat that regulates the tip temp. Does > it change if you sink the hot tip into a puddle of solder, cooling it? > > Cheers, Gene
Hi Gene, Nope, no change. It's a moan that lasts for about 2 seconds or so, stops, then repeats. It seems to start a little after the iron gets up to temp. And like I mentioned earlier, doesn't seem to affect the operation, but the sound is just annoying. 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
