Nokia RH-18 - Electronics of Nokia 1100; Environmental Specifications; Baseband HW Introduction; Technical Summary

RH-18/36/38 Company confidential
CCS Technical Documentation
Page 8 Nokia Corporation. Issue 1 10/03
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
operations watchdog will run out after approximately 32 seconds. Unfortunately, the
service routine can not be measured.
Figure 3: Phone jammed troubleshooting
Power doesn't stay on,
or phone is jammed
J404
Sleep clock = 32.768 kHz,
1.8Vpp
Yes
Check :
D450, Keymat,
Lightguide, PWB.
Else defective D400*
UI functionality,
and keys react
to pressure?
Check :
PWB.
Else defictive D200*
Yes
No
No
J402
PURX = 1,8VDC,
1 sec. after power-key is
pressed
Check :
C420, C426, R420,
R426, N600(Mjoelner)
Yes
No
Yes
Reflash phone
Check :
B200, C209, C210, PWB.
Else defective D200*
No
R426
26 MHz clock min.
300mVACpp,
probe Cin=10-13 pF/10M