Nokia RM-57 Service Manual page 221

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4.5 TX power vs. time ok? ............................................................................................................................................71
4.6 Troubleshooting pictures......................................................................................................................................72
4.6.1 VCTCXO Output (DC Offset 1.24 V)...............................................................................................................72
4.6.2 TXC in GSM mode (DC Offset 0 V) ................................................................................................................72
4.6.3 TX VC in GSM mode (DC Offset 1.8 V) .........................................................................................................73
4.6.4 Icont_21/Icont_22 (DC Offset 1.2 V)...........................................................................................................73
4.6.5 Icont_31/Icont_32 (DC Offset 1.2 V)...........................................................................................................74
4.6.6 GSM RX IQ (DC Offset 0.4 V)...........................................................................................................................75
4.6.7 RX VC in GSM mode (DC Offset 1.5 V) .........................................................................................................76
4.6.8 TX Modulation spectrum (GSM) ..................................................................................................................77
4.6.9 RFBUS..................................................................................................................................................................78
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Appendix A: RF Troubleshooting
A-3