Nokia NHL-2NA Series Troubleshooting Instructions page 28

NHL-2NA
Always check that the backup battery visually for any leakage or any other visual defect.
Check that the backup battery is correctly mounted in the device before closing the
cover.
1 Check with Phoenix is backup battery OK
2 Measure the voltage of backup battery
• Normal operation when the voltage is > 2.0V
• Fully charged when the voltage is about 3.2V (because of large internal imped
ance voltage won't stay above 3.0V a long time after charging is disabled)
3 Enable backup battery charging (start to charge main battery or boot device to
LOCAL or TEST mode)
4 Measure voltage of backup battery during charging, It should arise if it is not
3.2V, yet.
5 When the voltage is over 2.0V for sure, check backup battery with Phoenix.
-> If not OK then D190 is faulty.
6 Ensure that the RTC is running.
Page 22 ¤Nokia Corporation
CCS Technical Documentation
Issue 1 07/02