Nokia NHL-4J Series Troubleshooting Instructions Download Page 11 | Manualshive

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PA & ant switch

troubleshooting

Yes

Check with RF probe
signal level on
PA 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

Yes

No

No

No

No

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Summary of Contents for NHL-4J Series

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Page 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 ...

Page 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 ...

Page 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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Page 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...

Page 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...

Page 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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Page 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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Page 42: ...m C162 and C163 Is it 1kHz 0 5 0 8Vp p Set Radio and RF generator to 87 5 and 108 0 MHz Measure Audio from C162 and C163 Are both cases 1 kHz 0 5 0 8 Vp p Check V356 V357 L356 L357 C357 C358 C362 R359 R360 Test again with 87 5 and 108 0 MHz Measure audio from C162 and C163 Both OK Check C107 C108 C109 C117 L105 C367 C378 C379 L358 Measure signal from C162 C163 Is it 1kHz 0 5 0 8 Vp p Check R359 R3...

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Page 44: ... RI 9 DQG 9 ZLWK 0 WHVW VLJQDO RES BW 10 kHz VBW 10 kHz SWP 1 00 sec AT 0 dB REF 20 0 dBm LOG 10 dB CENTER 98 0000 MHz SPAN 300 0 kHz 71 03 dBm MKR 97 9280 MHz PEAK WA SB SC FS CORR 15 51 49 03 JUL 2002 SWEEP CONT SGL FREE RUN VIDEO LINE EXTERNAL SYNC CRD TV TRIG RES BW 10 kHz VBW 10 kHz SWP 20 0 msec AT 10 dB REF 0 dBm LOG 10 dB CENTER 196 450 MHz SPAN 1 000 MHz 9 40 dB MKR 196 440 MHz MEAS UNCAL...

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