[QtMoko] handset is (almost) unusable for voice calls with background noise
joerg at openmoko.org
Tue Jun 15 17:11:43 CEST 2010
[Peter Nijs Di 15. Juni 2010]:
> On Tuesday 15 June 2010 10:58:41 Joerg Reisenweber wrote:
> > Some FR have a problem of 2 capacitors in path to earpiece reducing max
> > possible earpiece level, while others have a correct 2 pcs 0R "wire"
> > instead. Actually for those I heard several complaints earpiece is too
> > loud :-)
> I also have the problem the earpiece is too quiet. I set "bypass" and
> volume" to maximum in SHR-testing. Especially in China (china mobile) I
> couldn't use my FR because the operator seems to lower the volume
> Can I expect the cap problem in the A5?
IIRC it was completely impossible to find out about the exact builds that had
the useless capacitors, as I couldn't find decent BOM which mentioned for
which SER# it applies
> And can I exchange these caps with
> 'wire' (or a drop of tin myself?
Yes, it's "easy" - you probably even can use silver varnish to short the
capacitors. Just check the schematics and component placement, there are only
2 (symmetrical) 0R mentioned in earpiece patch, in series from amp to the
transducer. You have to open a can to reach them IIRC. This also should be
mentioned on hardware ML, and probably as well in wiki.
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