Power Does Not Stay On Or Phone Is Jammed - Nokia 2650 Service Manual

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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 PWB.
If for some reason the MCU does not service the watchdog register within the UEM, the oper-
ations watchdog will run out after approximately 32 seconds. Unfortunately, the service routine
can not be measured.
Power doesn't stay on,
Issue 2 06/2005
Figure 5:Phone jammed troubleshooting
or phone is jammed
J404
Sleep clock = 32.768 kHz,
1.8Vpp
Yes
J402
PURX = 1,8VDC,
1 sec. after power-key is
pressed
Yes
UI functionality,
and keys react
to pressure?
Yes
R426
26 MHz clock min.
300mVACpp,
probe Cin=10-13 pF/10M
Yes
Check :
D450 (Flash)
Yes
Reflash phone
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Check :
No B200, C209, C210, PWB.
Else defective D200*
Check :
No PWB.
Else defictive D200*
Check :
D450, Keymat,
No
Lightguide, PWB.
Else defective D400*
Check :
No C420, C426, R420,
R426, N600(Mjoelner)
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