User Guide

CC Technical Documentation Troubleshooting - BB
NPM-10 (3595)
Issue 2 03/2004 ©2004 Nokia Corporation Confidential Page 7
Power Does Not Stay on or Phone is Jammed
If this kind of failure is presenting itself immediately after FLALI, it is most likely caused
by ASICs missing contact with the PWB.
If for some reason the MCU does not service the watchdog register within the UEM, the
operations watchdog runs out after approximately 32 seconds. Unfortunately, the service
routine cannot be measured.
Figure 4: Power does not stay on or the phone is jammed
Power doesn’t stay
on or phone is
jammed
J404
Sleep clock = 32.768 kHz,
1.8 Vpp
J402
PURX = 1.8 VDC, 1 second
after power key is pressed
Do UI functionality and
keys react to pressure?
J425
26 MHz clock min.
300 mVACpp, probe
Cin=10 - 13 pF/10M
Yes
Yes
Yes
Yes
CHECK:
B200, C209, C210, PWB. Else
defective D200
No
No
No
CHECK:
PWB, else defective D200
CHECK:
D450, key mat, light guide, PWB.
Else defective D400
CHECK:
C425, C426, R425, R426, N600
(Mjoelner)
No
Reflash the phone