Nokia 300 Service Manual page 101

RM-781
Cellular RF troubleshooting
4. GSM transmitter is activated when Active Unit is set to "Tx". N7509 supply voltages are on for
measurement purposes after this step is completed.
Optional step (not needed if GSM TX activation only required): Check the basic TX parameters (i.e. power,
5.
phase error, modulation and switching spectrum) manually, using a communication analyzer (for example
CMU–200). Change power level (in "RF Controls" tool) and make sure the power reading follows
accordingly.
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