User Guide

RAE-6/RA-4
Nokia Customer Care 6 - Baseband Description and Troubleshooting
58 COMPANY CONFIDENTIAL Issue 1 12/04
Copyright © 2004 Nokia. All Rights Reserved.
■ APE clock and reset troubleshooting
APE clocks
and reset check
Clk32k (R4810):
Voh ~ 2.8V &
f ~ 32.768kHz
square wave ?
Check completed
Check R4810.
Replace D4801 if it
seems to be properly
soldered
Check R6041,
R6042, C6038,
R6040, R6039,
R6043, R6044,
V6030, V6031.
Change V6031 and
C6038 if no faults are
found.
12Mhz clock
(C4800,
OSC1_IN):
12MHz signal
present ?
Yes
Yes
SleepClk (J2802):
Voh ~ 1.8V &
f ~ 32.768kHz
square wave ?
No
No
Yes
Solder joints of
C4800, C4801,
C4802 and B4800
OK ?
Measure
resistance over
C4801.
R >>1M ?
No
Yes
Yes
No
Change B4800. If
this doesn't help,
change C4800,
C4801 and C4802.
Still not
working
Measure
MPU_nRESET
from R4802.
Is it ~ 2.8V?
Yes
No
Measure PURX
from J2800.
Is it ~ 1.8V?
No
Yes
Check R4802.
Replace N4800 if it
seems to be
properly soldered
Fault is in non-
reworkable
component. Refer to
current BER handling
guidance. (UEMEK
D2200 problem).
Fault is in non-
reworkable
component. Refer to
current BER handling
guidance. (OMAP
D4800 problem).