Power Does Not Stay On Or Phone Is Jammed - Nokia RH-18 Troubleshooting Instructions

RH-18/36/38

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.
Power doesn't stay on,
Page 8
Company confidential
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
Reflash phone
Figure 3: Phone jammed troubleshooting
Nokia Corporation.
CCS Technical Documentation
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)
Issue 1 10/03