User Guide

RH-37
6(a) - BB Troubleshooting Instructions Nokia Customer Care
Page 14 Nokia Corporation Issue 1 07/04
Phone is jammed 2
Measure
watchdog signal
CBUSDA from
testpoint J2805.
Is it ok?
Measure
FBUSRX signal
during phone info read
from testpoint J2810.
Is it OK?
Measure
FBUSTX signal
during phone info read
from testpoint J2809.
Is it OK?
Yes
No
No
No
Yes
No
No
No
Yes
Yes
Jammed
2
Phone
shutsdown after
30sec?
Measure
DBUSClk 13MHz
signal from
testpoint J2811.
Is it OK?
Check phone
info.
Is it OK?
Change UEM
Change UPP
Change UEM
Change UPP
See Waveform 7
See Waveform 6
See Waveform 8
Retest
Waveform 6
Waveform 7
Waveform 8