Hello everybody,
I've recently purchased a Hakko FR-410 desoldering station which turned out to have a pulsating hum, also being able to feel vibrations on the case. I could return it (purchased from an official Hakko distributor in Europe) and after receiving the replacement station it also appears to have the same hum/vibration most likely coming from the transformer.
Since I've had two new stations now, both with the same problem, I am starting to wonder, if this is a bad batch or if I might have problems with mains power in my house.. I have never experienced problems like that with any other tools I've been using over the years (mainly Weller and Metcal), so I am a bit clueless what's going on. The distributor checked the unit before shipping and said it's ok, only very light noise which is normal, but the noise the stations are making at my place definitely is anything else than normal and VERY annoying.
It's quite difficult to get in touch with Hakko directly, so maybe somebody here could share his thoughts on this problem..
Thank you!