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Страница 9: ...M1900 OK Check all power levels OK TX power levels OK No Yes No Check output signal on 500 MHZ span Signal found on incorrect frequency Yes Synthesizer troubleshooting Check with RF probe signal level on PA input 0dBm OK Yes HELGA troubleshooting No Yes tuning and check tuned RAC values Highest level 700 900 Lowest level 190 210 Base levle 160 190 Major differences Check with oscilloscope PA ctrl ...

Страница 10: ...ng Check with oscilloscope TXI TXQ signals VR1 VR2 VR4 VR5 VR6 2 8V VrefRF01 1 35 V HELGA serial interface TXP TXC signals OK No Check with RF probe 4G VCO out signal 3589 6 MHz GSM900 3495 6 MHz GSM1800 3760 MHz GSM1900 Level 10dBm OK No dead Replace HELGA Yes Check modulator output components OK Replace faulty component s When 1kOhm passive probe is used correct the measurement result by 26dB ...

Страница 11: ...A input 0dBm OK Yes Replace ant switch Yes When 1kOhm passive probe is used correct the measurement by 26dB Check with oscilloscope VANT_1 GSM900 VANT_2 GSM1800 VANT_3 GSM1900 OK Check with oscilloscope VBATT 4V VTXB 2 8 V pulsed VTxLO_GSM 0V GSM900 OK Check VANT lline components OK Replace PA Replace HELGA Replace faulty component s Check components around PA OK Replace faulty component s Yes Yes...

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Страница 18: ...al interface burst mode Synthesiszer trou bleshooting Spectrumanalyzer 4G VCO out 3769 6MHz 30 dBm Oscilloscope VANT_1 3 0V Oscilloscope Check HELGA serial interface burst mode Check HELGA N500 Check Base band Spectrumanalyzer reading with 1 kohm passive probe right val ue add 34 dB All spectrumanalyzer reading values are measured with 2 5 kohm passive probe use tweezers to connect the probe groun...

Страница 19: ...6 2 7V Check HELGA serial interface burst mode Check C838 C839 L821 L 872 C836 C837 V801 Oscilloscope VANT_1 3 0V Oscilloscope Check HELGA se rial interface burst mode Check HELGA N600 Check Base band Spectrumanalyzer reading with 1 kohm passive probe right val ue add 26 dB All spectrumanalyzer reading values are measured with 1 kohm passive probe use tweezers to connect the probe ground to the ne...

Страница 20: ...mode Check HELGA N500 Check Base band Check C831 L811 Spectrumanalyzer reading with 1 kohm passive probe right val ue add 26 dB All spectrumanalyzer reading values are measured with 1 kohm passive probe use tweezers to connect the probe ground to the nearest PWB ground Reading value is represented without 26 dB compensation Spectrumanalyzer Antenna Switch input 84 dBm Spectrumanalyzer HELGA inputs...

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Страница 22: ... 4G VCO out signal 3589 6 MHz GSM900 3495 6 MHz GSM1800 3760 MHz GSM1900 Level 10dBm OK VCO out signal level 10dBm Check balun output levels and solder joints OK Check output signal on 1 GHz span Signal found on incorrect frequency Check with oscilloscope 4G VCO Vcc 2 7V OK Baseband troubleshooting Check with oscilloscope Check with oscilloscope VCO control voltage VCO control voltage from VCO pin...

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