User Guide
CCS Technical Documentation Troubleshooting — RF
RH-17
Issue 1 04/2003 Nokia Corporation Confidential Page 21
Record the TX signal power from the antenna connector using a spectrum analyzer cen-
tered at 836.52Mhz. (The self-test measures the power detector reading instead, but at
the present time this cannot be done with Phoenix, therefore an easy way to check func-
tionality without removing the covers is to check transmitted power. If the covers are
removed, the voltage on PWR_OUT, at probing point J603 can be measured.) Transmitted
power should be greater than 24dBm. (PWR_OUT greater than 1.91v, which corresponds
to the power detector ADC=700).
For each of the next three cases, TX power should be less than 24dBm (less than 1.91v on
PWR_OUT.
1. TX_IF_AGC to -80
TX_RF_AGC to -512,
PA_AGC to -512
2. TX_IF_AGC to +511,
TX_RF_AGC to -512,
PA_AGC to +511
3. TX_IF_AGC to -80
TX_RF_AGC to +511
PA_AGC to +511.
Troubleshooting
If there is a failure associated with only some of the cases above, check the AGC voltages
and components of the associated PDMs as described in Table 1. For problems with the IF
or RF AGC, also check Robin and supporting components. For PA AGC problems, also
check the PA and supporting components. If all of the above cases fail, troubleshoot the
TX chain as described in Probing/Troubleshooting Tables. If all the output powers are
passing, then perhaps the test is failing because the ADC voltage is wrong (which at this
point we cannot read, so we are measuring the actual output power). This can be verified
by measuring the voltage on the PWROUT probing point J603, the limit is 1.64v. If the
voltages are wrong, then check the power detector at R801, L801, R805, and C807, and
also Robin. If the voltages are correct and it still fails, check the UEM (D200).
Test 17 SN CELL PA Temp
Description
This is one of the phone’s self-tunings, which reads the ADC voltage of a thermistor
R808, and checks to make sure the phone is at room temperature. The reason for this is
that we don’t want to tune a phone while it is hot or cold.
Explanation of Result
The phone reports the ADC voltage value of the thermistor, and it should be within the
limits.
Manual Verification
Ensure the phone is cool by letting it cool down for several minutes, and retest, keeping