Backup Battery Troubleshooting - Nokia RM-506 Service Manual

RM-505; RM-506
BB Troubleshooting and Manual Tuning Guide

Backup battery troubleshooting

Verify that the backup battery G2200 is empty (U<1V). Switch the phone on. Measure voltage of the battery
when the main battery is connected to the phone and the phone is switched on. Wait a few minutes and
monitor that the backup battery voltage rises. Switch off the phone, disconnect the main battery and monitor
that the voltage of the backup battery decreases. Normal behaviour of the voltage is described in the figures
below:
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