Nokia RH-47 Series Description page 40

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RH-47

7 - Baseband Description & Troubleshooting

needed to fully charge the backup battery in the device. NOTE: Backup battery is charged

only at the same time with main battery charging or when the device is in LOCAL or TEST

mode.

Always check 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.

Check with Phoenix that backup battery is OK.

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 will not stay above 3.0V a long time after charging is disabled)

Enable backup battery charging (start to charge main battery or boot device to LOCAL or

TEST mode).

Measure voltage of backup battery during charging. It should arise, if it is not 3.2V, yet.

When the voltage is over 2.0V for sure, check backup battery with Phoenix.

-> If not OK, then D190 is faulty.

Ensure that the RTC is running.

Page 40

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Nokia Customer Care

Issue 1 05/04

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Troubleshooting