User Guide

Issue 1 12/04 COMPANY CONFIDENTIAL 59
Copyright © 2004 Nokia. All Rights Reserved.
RAE-6/RA-4
6 - Baseband Description and Troubleshooting Nokia Customer Care
■ CMT troubleshooting
CMT Check
No
Fault is in non-
reworkable
component. Refer
to current BER
handling guidance.
(StUF D2800 /
UEMEK D2200
problem).
Replace defect
components
Measure voltages from
following components:
VANA C2216 2.78V
VIO C2885 1.8V
VCORE C2880 1.35V / 1.57V
VR3 L7500 2.78V
VFLASH1 C2220 2.78V
Voltages OK?
Check that both
ends of L2330-
L2335 have VBAT
voltage
Check L2330-
L2335. C2000-
C2002 and C2330-
C2335 Are they
OK?
No
Yes
Check VBAT lines
from battery
connectorX2020 to
L2330-L2335
Yes
No
Check if the voltage
lines have short
circuits to GND?
Find and replace
short circuited
component
Yes
No
Fault is in non-reworkable
component. Refer to current BER
handling guidance. (UEMEK D2200
problem).
Yes
Measure PURX
signal from J2800.
Is it ~1.8V?
Measure ~32.7kHz
SleepClk J2802. Is it
OK?
No
Measure 26MHz
RFClk from R2902.
Is it OK?
Yes
No
Measure 26MHz
RFClk from
VCTCXO G7501 pin
3. Is it OK?
No
Check R2902 and
C2902. If OK,
change Honi N7500
Yes
Yes
No
Yes
Chech BSI-line
including X2020,
C2015 and C2350.
Are they OK?
No
Yes
Replace defect
components
Replace VCTCXO
G7501
Measure PURX
signal from R4802.
Is it ~2.8V?
No
Check R4802.
Replace N4800 if it
seems to be
properly soldered
Yes