Openmoko Bug #2229: GSM was working fine for months, suddenly will not register using any GSM stack
Openmoko Public Trac
bugs at docs.openmoko.org
Thu May 7 18:13:07 CEST 2009
#2229: GSM was working fine for months, suddenly will not register using any GSM
stack
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Reporter: danek2 | Owner: joerg
Type: defect | Status: accepted
Priority: normal | Milestone:
Component: hardware | Version: GTA02v5
Severity: critical | Keywords: calypso, gsm, registration
Haspatch: 0 | Blockedby:
Estimated: | Patchreview:
Blocking: | Reproducible: always
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Changes (by joerg):
* severity: normal => critical
Comment:
Replying to [comment:10 slm3095om]:
> How long does the voltage drop have to last to affect the modem? I could
throw together a "poor man's oscilloscope" using an Arduino board. I can
sample one of the 10bit ADCs about 500 times per second; that should allow
me to detect the voltage drop if it last for 4 or 5 milliseconds. Not a
10MHz scope by a long shot, but is it close enough?
That would be pretty good. A dropout is for sure in the range of tens of
ms at least.
Maybe you could check the schematics / placement and test on both pads of
R1752 (NC) and on H-TP1701
--
Ticket URL: <https://docs.openmoko.org/trac/ticket/2229#comment:11>
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