Trouble Shooting Guide, Advanced
4/00021-3/FEA 209 544/25 C
Ericsson Mobile Communications AB
19(78)
6.3
How to find the fault
The fault can be in either the current measuring or the logical part/the AD-transforming.
Start the board in EFRA with the test program.
Set the battery voltage at 3.7 V
DC
.
Set DCIO at 5.2 V
DC
, and connect the DCIO-voltage to the system connector.
Measure CHSENSE- on R727 (3.7 V
DC
).
Go to Logic \ Current calibration.
Perform the test and measure CHSENSE- on both low and high current,
they should be 3.75 V
DC
and 3.96 V
DC
.
If the voltage is incorrect, the fault depends on R727 or V720.
Also measure R726, it should be 0.0 Ohm.
If the fault still remains it is probably depending on N700.