Re: 11801 questions - funny fan noise and light
Thank you gentlemen for your replies!toggle quoted messageShow quoted text
So it is unclear if it is supposed to do this, but it is at least not
I checked the voltages on the feed wires to the fan relative chassis ground.
From start, the positive wire has about +6.3 V and the negative about +0.7 V.
When the fan revving occurs, the negative wire goes to about -6 V for about
35 ms, making a total voltage over the fan of about 12 V. For some reason
the pulses come irregularly, around 1 or a few times per second.
My current hypotheses is that the intention is to regulate the speed of
the fan, but I would be surprised if this actually is how it was designed
to work. It is somewhat annoying. :-)
Are there any schematics on these boxes to be found?
Also - the neon (?) light in the power supply, right behind the fan, that
starts to flicker as soon as it has power (also in standby mode) - do you
guys have that too?
Thanks for you help and best regards,
On 25 Jan 2020, at 16:01, Chuck Harris <email@example.com> wrote: