![Nokia 6260 RM-25 Service Manual Download Page 148](http://html.mh-extra.com/html/nokia/6260-rm-25/6260-rm-25_service-manual_253259148.webp)
Figure 86 ADC reading window in Phoenix
Table 22 Maximum tolerances
Reading
Check point
Tolerance
Vbatt SCAL
4.2V
±25mV
Vchar
8.4V
±40mV
lchar
500mA
±20mV
BSI
75k (BL-4C)
±1.3kohm
Btemp
273K (47k)
+5K
Backup battery troubleshooting
A symptom of a backup battery fault is that Real Time Clock loses the correct time during short battery removal.
The same symptom can also be seen when the backup battery is empty. About 30 minutes is needed to fully
charge the backup battery in the device.
Note:
The backup battery is only charged at the same time as the main battery or when the device is
in the 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 the backup battery is OK.
Measure the voltage of the backup battery.
• Normal operation when the voltage is > 2.0V.
• Fully charged when the voltage is about 3.2V.
Enable the backup battery charging (start to charge the main battery or boot the device to LOCAL or TEST mode).
Measure the voltage of the backup battery during charging, it should rise if it is not 3.2V yet.
When the voltage is over 2.0V for certain, check the backup battery with Phoenix.
RM-25
Nokia Customer Care
Baseband troubleshooting
Page 6–18
Company Confidential
9235618 (Issue 2)
Copyright ©2005 Nokia. All Rights Reserved.