Table of Contents
Advertisement
Trouble Shooting Guide, Advanced
13.3 How to find the fault
Start the phone in the test program.
Set the battery voltage to +6.5 V
.
DC
Measure the exact voltage at VBATT, N450 pin 17 and VRAD, N450 pin 13.
Use the formula in section 1 to calculate VTRACK.
Example: VBATT = +6.5 V
, VRAD = +3.8 V
gives VTRACK +1.9 V
DC
DC
DC
Measure VTRACK on N450 pin 2.
If VTRACK is incorrect, is it due to the feed voltage VRAD or N450.
If VTRACK is correct, go to Logic \ Read ADC.
Read the value for VTRACK.
If both the voltage VTRACK and the ADC-value are correct there is probably nothing wrong
with the phone.
Calibrate again.
If only the ADC-value is incorrect, is it usually due to the feed voltage VANA or N800,
sometimes on D600.
4/00021-3/FEA 209 544/18 B
58(121)
Advertisement
Table of Contents
