User Guide

Issue 1 12/04 COMPANY CONFIDENTIAL 55
Copyright © 2004 Nokia. All Rights Reserved.
RAE-6/RA-4
6 - Baseband Description and Troubleshooting Nokia Customer Care
■ MDOC troubleshooting
Measure
MDOC Busy#
at R4801 and
RSTIN# at
J4803
Busy# signal rises
at latest after
1055us after
RSTIN# rises.
However, the Busy#
can be high before
RSTIN# rises, but this
is not taken into account.
Busy#
stays low
Backup user data before
MDOC troubleshooting, if
possible
Correct
voltages
Boot phone.
Use oscilloscope.
Start
All signals in this
troubleshooting are in
range 0 - 2.8V
Check MDOC
I/O voltage at
C5001, is it
~2.8V?
Check MDOC
core voltage at
C5000, should
be ~2.8V
Correct
voltages
Go to EM
troubleshooting
Voltage levels
invalid
RSTIN# stays low
Voltage
level
invalid
Check resistor
R4801
~10k
Yes
No
Replace resistor
R4801 and rerun
first test
MDOC damaged,
replace D5000
Check resistors
R5000 and
R5001,
both ~10k
No
Replace damaged
resistor(s)
Yes
Go APE clocks and
reset troubleshooting
Measure
MPU_nReset
at R4802, low
to high
transition?
Stays low
Yes
Measure
CS0# at J4805
and OE#
J4802,
toggling?
No
Yes
Check resistors
R5000 and
R5001,
both ~10k
No
Replace damaged
resistor(s)
Yes
Memory corrupted,
replace MDOC
D5000
OMAP FAULT? Fault is
in non-reworkable
component. Refer to
current BER handling
guidance.