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 -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> is up! Q: What's yellow, and equivalent to the Axiom of Choice? A: Zorn's Lemon. ------------------------------------------------------------------------------ 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
