User Guide

CCS Technical Documentation Baseband Troubleshooting Instructions
RH-12/RH-28
Issue 1 02/04 Nokia Corporation Page 9
Phone doesn’t stay on, or phone is jammed
If this kind of a failure is presenting itself immediately after FLALI, it is most likely caused
by ASICs missing contact with PWB.
If the MCU doesn’t service the watchdog register within the UEME, the operations
watchdog will run out after approximately 32 seconds. It is not possible to measure this
service routine.
Figure 3: Phone doesn’t stay on, or is jammed
Phone doesn't stay on or phone is
jammed
Sleep clock on J401:
~32,768kHz, 1,8Vpp
Yes
Check:
B200, C209, C210, D200 and
PWB
NO
Verify that system clock is @
~26MHz, min 300mVACpp on
C422 pin2 towards D400 (TIKU)
with regular probe Cin ~10-13pF /
10M
Yes
Check:
C422, R420, C514, C515, L515,
N500 (Helgo), G501 (26MHZ
XTAL) and pwb.
NO
Measure voltage on PURX =
1,8Vdc on J404 or N131 pin 3
~1sec after power key is pressed.
Yes
Check:
D200 and pwb
NO
UI functionality and keys react to
pressure
Yes
Check:
D400, D450, D451, Z300, Z301,
UI-board, keymat, lightguide and
pwb.
NO
Is everything working until phone
shuts down after ~32sec
Yes
Change D200 (UEME)Yes
No
Retest and if phone still doesn't
work change whole engine board.