GSM-noise "buzz" issue

Joerg Reisenweber joerg at
Sat Sep 13 04:32:36 CEST 2008

Am Do  11. September 2008 schrieb Torsten Sievers:
> Hi Joerg,
> good work so far. do you have any update on this?

Well, recent reports from actual lab in Taipei are fuzzy and sparse (I 
unfortunately can't reproduce the buzz-issue here at my european lab), but it 
sounds like we can confirm it's a viable fix to cut pin4 of JK4401 and 
connect the mic signal to this trace somewhere else with a bead (even for 
headset connected :).
I'm about to test a rework-recommendation (involving Dremel/Proxxon) that's 
not including desoldering of JK4401, which is a really difficult task for 
everybody not equipped with a 4500EUR ERSA-SMT_rework station (at least if 
you care about not breaking the whole device during rework).
ATM I get low priority and few support on this from the company, as everybody 
is busy with GTA03 (and I'm with 04 ;-). But stay assured I'll not stop on 
the issue until I find I got to *some* kind of an end of the story.

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