Adc-Reading; Backup Battery - Nokia RH-47 Series Description

Hide thumbs Also See for RH-47 Series:

Table of Contents

Nokia Customer Care

Vbatt offset and Gain:

Inspect Vbatt lines and component in it.

Vchar over limits:

Inspect components which are connected to Vchar line: F380, L380 and V380.

Ichar over limits:

Inspect components which are connected to Vchar line. If those are OK, first change cur-

rent sense resistor (R190). If calibration is still not successful, change UEM.

Calibration can be checked by using ADC-readings. Known voltages, currents and resis-

tances are fed and read by ADC-readings, read values and known values can be com-

pared.

ADC-reading

Divided and Scaled Battery Voltage, Charger Voltage, Charger Current, BSI and Btemp

values can be read by this tool. Read values a few times before you can be sure that the

results are accurate.

NOTE: If Vbatt Scaled and Divided unit results are different, default calibration values are

used. In this case perform EM calibration to get full performance of the phone.

A symptom of a backup battery fault is that the real time clock loses the correct time

during short main battery removal.

The same symptom can also be seen when the backup battery is empty. About 5 hours is

Issue 1 05/04

Company Confidential

6 - Baseband Description and Troubleshooting

Company Confidential

RH-47

Page 39

Table of Contents