User Guide

CCS Technical Documentation Troubleshooting — RF
RH-17
Issue 1 04/2003 Nokia Corporation Confidential Page 9
Troubleshooting Summary
If TX power is low, turn on transmitter in local mode using Phoenix. Check:
1 Current (0.7 - 1 A for max power, mode and channel dependent),
2 Perform visual inspection of PWB under microscope to check proper placement,
rotation, and soldering of components.
3 Look for presence of TX signal on spectrum analyzer at the correct frequency. If
signal is not on frequency, check in 100 MHz span. If signal is present but off fre-
quency, check synthesizer. If signal is not present, or present but low in ampli-
tude, use probing Tables 1 through 7 to determine where in the chain the fault
occurs, with AGC PDMs set for known transmit power as listed in Table 1.
4 Check that AGC PDMs are set for desired TX power according to Table 1 and
ensure AGC voltages are correct.
5 According to Tables 2 and 3 (cell/AMPs), check the LOs for proper frequency and
amplitude.
6 Ensure power supplies to transmitter have correct voltage, as per Table 13.
126 TN LNA CELL LO LowGain -601 4289
127 TN LNA CELL LM LowGain -601 4289
128 TN LNA CELL ML LowGain -601 4289
129 TN LNA CELL MD LowGain 423 3777
130 TN LNA CELL MH LowGain -601 4289
131 TN LNA CELL HM LowGain -601 4289
132 TN LNA CELL HI LowGain -601 4289
133 TN LNA CELL LO HighGain 3475 8365
134 TN LNA CELL LM HighGain 3475 8365
135 TN LNA CELL ML HighGain 3475 8365
136 TN LNA CELL MD HighGain 4499 7853
137 TN LNA CELL MH HighGain 3475 8365
138 TN LNA CELL HM HighGain 3475 8365
139 TN LNA CELL HI HighGain 3475 8365
140 NVD Write RF Params Pass/Fail-
Test
141 NVD Write Non RF Params Pass/Fail-
Test