User Guide

Energy management calibration

EM calibrations should be carried out with a JBV-1 docking station attached to a DA-44 docking station adapter.

Power to JBV-1 should be supplied from an external DC power supply. JBV-1 input voltages: nominal + 12 VDC,

maximum +16VDC.

On the JBV-1, A/D converter, BSI, BTEMP, battery voltage (VBAT), charger voltage (VCHAR), charger current (ICHAR)

and battery current (IBAT) are calibrated.

Baseband troubleshooting tips

ADC-offset over limits

Inspect the BSI line and its components. Note that the BSI resistance line of the battery is connected to the AD

input of the UEMEK labelled LS (not the BSI input). If these are OK, change PWB.

BSI gain over limits

Inspect the BSI line and its components. Note that the BSI resistance line of the battery is connected to the AD

input of the UEMEK labelled LS (not the BSI input). If these are OK, change PWB.

VBAT offset and gain

Inspect VBAT lines and its components.

VCHAR over limits

Inspect components that are connected to VCHAR line: filtering capacitors C134, C135, TVS V130, L130 and fuse

F130. If those are OK, change PWB.

ICHAR over limits

Inspect components that are connected to VCHAR line: filtering capacitors C134, C135, TVS V130, L130 and fuse

F130. If those are OK, change the current sense resistor R259 first. If calibration is still not successful, change PWB.

Calibration can be checked using the ADC reading. Known voltages, currents and resistances are fed to and read

by the ADC reading. The read values can then be compared with the known values.

ADC reading

Divided and scaled battery voltage, battery current, charger voltage, charger current and BSI values can be read

by this tool. Read values a few times until you can be sure that results are accurate.

RM-51

Baseband troubleshooting Nokia Customer Care

9238460 (Issue 1) Company Confidential Page 6–17