User Guide

RAE-6/RA-4
Nokia Customer Care 6 - Baseband Description and Troubleshooting
56 COMPANY CONFIDENTIAL Issue 1 12/04
Copyright © 2004 Nokia. All Rights Reserved.
■ SDRAM troubleshooting
Go to MDOC
troubleshooting
Run
ST_APE_RAM
_TEST, with
Phoenix.
Result?
Fail
Pass
Change SDRAM
D5080
Measure
SDCLK
frequency at
R4808
>70MHz?, level
0 - ~V18
Measure
SDRAM
voltages V18 at
C5083
Measure
SDRAM
voltage V18 at
C5083
No
Yes
Correct
Incorrect
Check and replace
if needed C5083-
C5089, resistance
>>1Mohm
Correct
Incorrect
Phone might have
been dropped, solder
balls cracked, replace
D5080
Visit APE Power
troubleshooting
Incorrect
Measure
SDRAM
voltages V18 at
C5083
Correct
No
Still problem
occurs?
Yes
Phone might been
dropped, solder balls
cracked, replace D5080
Start
All signals in this
troubleshooting are in
range 0 - V18
Inspect R4808
value, approx
22ohm
No
Replace
R4808 and
measure
SDCLK
frequency
>>70Mhz
Yes
Repeat
ST_APE_RAM
_TEST with
Phoenix
Fail
Yes
Problem occurs
while booting?
No
Yes
Go to MDOC
troubleshooting
Change SDRAM
D5080
No Pass
End
StUF FAULT?
Fault is in non-
reworkable
component. Refer
to current BER
handling guidance.