User Guide

RH-17
Troubleshooting — RF CCS Technical Documentation
Page 24 Nokia Corporation Confidential Issue 1 04/2003
age is at 2.80 Vdc. Baseband components D200, D400, and D450 are soldered and
aligned correctly.
NOTE: All BB calibrations must be performed whenever UEM (D200) is replaced. In other
words, alignment is necessary at ATE.
Test 28 BB Cal BSI Gain
Description
This baseband calibration teaches the ADC what a 68k ohms emerges at the BSI pin.
Explanation of Result
BSI Gain ADC factor
Manual Verification
In Phoenix, set phone to local mode, then EM Calibration. Press read from phone.
Troubleshooting
BSI resistor value varies, dependent on fixture being used (e.g., JBV-1 (with adapter MJF-
28), FLA-44 or MJS-82. Check the BSI components X101, C109, C230, R206, and R203.
Check that VFLASH voltage is at 2.80Vdc. Baseband components D200, D400, and D450
are soldered and aligned correctly.
Test 29 BB Cal VBAT Gain
Description
This baseband calibration teaches the ADC what two different voltage inputs look like.
Lower known voltage input is 3.1 Vdc and higher input is 4.2 Vdc. This voltage-scaler cir-
cuit is used to form the voltage into the proper range.
Explanation of Result
The gain factor is a result of scaled value and the global value determined in Test 25 and
used to calculate VBAT Gain.
Manual Verification
In Phoenix, set phone to local mode, then EM Calibration. Press read from phone.
Troubleshooting
Check Battery Connector X101, baseband components D200, D400, and D450 are sol-
dered and aligned correctly. Remember that this gain factor is determined using Test 25
as a reference. Make sure it was within limits also.
Test 30 BB Cal VBAT Offset
Description
This baseband calibration teaches the ADC what two different voltage inputs look like.
Lower known voltage input is 3.1 Vdc and higher input is 4.2 Vdc. This voltage-scaler cir-