User Guide

CCS Technical Documentation Troubleshooting — RF
RH-17
Issue 1 04/2003 Nokia Corporation Confidential Page 23
(N701) in AMPS mode.
Explanation of Result
Use Batch Tuning window in Phoenix, select RF Tunings and check value.
Manual Verification
Use RF Tuning window in Phoenix, set mode to “self tune” and choose this tuning.
Troubleshooting
Check Batman (N701) and supporting components.
Test 23 and 24 SN AMPS RX DC Offset I (or Q)
Description
This is one of the phone’s self-tunings which measures and adjusts the cell band AMPS
receiver DC offsets until they are within the limits.
Explanation of Result
The DC offset is returned for I (or Q).
Manual Verification
Use Batch Tuning window in Phoenix, select RF Tunings and check value.
Troubleshooting
In Phoenix, put phone in local mode, then AMPS RX. Check voltage at Batman (N701) at
test points TP45-TP48 and supporting components at Batman IC.
Test 25 - 27 BB Cal ADC Gain
Description
This calibration trains the BB ADC to two known voltage inputs. Because of the inaccu-
racy of an analog-to-digital converter, it must be calibrated using known values. Once
values are established, phone will be able to calculate the other ADC calibrations accu-
rately. Converter gain and offset parameters are calculated by measuring a voltage input
on BSI line of 0.7 Vdc and 2.1 Vdc. Also, some calibrations use the reference voltage V
REF
.
It is calculated from offset and gain: V
REF
= offset + 1023 x gain.
Explanation of Result
ADC Gain, Offset and Vref values
Manual Verification
In Phoenix, set phone to local mode then EM Calibration. Press read from phone. Gain
factor is 0.0001 mV/bit, Offset is measured in mV.
Troubleshooting
Check the BSI components X101, C109, C230, R206, and R203. Check that VFLASH volt-