Energy Management Calibration - Nokia NHL-2NA Series Troubleshooting Instructions

NHL-2NA

Energy management calibration

During energy management calibration A/D-converter, BSI, Btemp, Battery voltage,
Charger voltage and Charger current are calibrated. For detailed information and
instructions see EM-calibration instructions in service manual.
Troubleshooting tips:
ADC-offset over limits:
Inspect BSI line, connectors (hotbar and board to board connector) and components in it
(Varistor R008, EMI-filter Z383, Pull-up resistor R384). If these are OK, change UEM.
BSI Gain over limits:
Inspect BSI line, connectors (hotbar and board to board connector) and components in it
(Varistor R008, Capacitor C002, EMI-filter Z383, Pull-up resistor R384). If these are OK,
change UEM.
Btemp Gain over limits:
Inspect Btemp line, connectors (hotbar and board to board connector) and components
in it (Varistor R006, Capacitor C010, EMI-filter Z383, Pull-up resistor R383). If these are
OK, change UEM.
Vbatt offset and Gain:
Inspect Vbatt lines and component in it.
Vchar over limits:
Inspect components which are connected Vchar line: Filtering capacitors C005, C006,
C011, TVS V009, L001 and Fuse F001. If those are OK, Change UEM
Ichar over limits:
Inspect components which are connected at Vchar line: Filtering capacitors C005, C006,
C011, TVS V009, L001 and Fuse F001. If those are OK, First change current sense resistor
(R190), if calibration is not still successful change UEM.
Calibration can be checked using ADC-redings. Known voltages, currents and resistances
are fed and read by ADC-readings, read values and known values can be compared.
Page 20 ¤Nokia Corporation
CCS Technical Documentation
Issue 1 07/02