Mark Wendt 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. > Could be, but it may just be the effect of unbalanced transformer flux from the SCR control. If they have the SCR/Triac on the primary of the transformer, then this is almost certain to unbalance the flux. Has it always done this? If so, my theory is probably right. If it has only started recently, and is getting worse, then it may be fading capacitors.
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