GSM-noise "buzz" issue
angus.ainslie at gmail.com
Fri Sep 12 03:04:01 CEST 2008
> On Tuesday 26 August 2008 14:22:54 Joerg Reisenweber wrote:
> > We found it's pin4 of JK4401 and only this pin that causes GSM-EMI-noise
> > issue.
> > We placed a ferrite bead to this pin, and it stops noise. Alas this isn't
> > viable rework, as it is extremely fragile and doesn't fit into case.
> > See
> > <
> > We tried to find another way to place a bead in this rail, first result
> > (without bead yet), see
> > <
> > This rework at least stops noise and should fit into case. It breaks
> > function of headset mic and hold-button, but keeps function of
> > We try to find a way to restore function of mic and button, based on this
> > rework.
> > I will keep you updated.
> > Please note all this IS NO RECOMMENDATION FOR A REWORK, and we can't
> > any questions yet beyond what I've reported above.
> > cheers
> > jOERG
Even thought this is not not a recommended rework I started on it. I
(wrongly) assumed by just removing the connector that it would fix the noise
issue. It doesn't.
I'm assuming that is because pin 3 and 5 need to be shorted. I've been
trying to find the pinout for JK4401 but no luck yet. Is it
plugin end -> or
Does anyone have a pin-out ?
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