User Guide

NHM-4
CCS Technical Documentation
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HAGAR troubleshooting
Check with oscilloscope
No
–TXI/TXQ signals
–VR2, VR4, VR6 = 2.7V
OK?
Yes
Check with RF probe
No
4G VCO out signal
3589.6 MHz (GSM900)
OK?
Yes
-VrefRF01, VrefRF02 = 1.35V
-HAGAR serial interface
-TXP & TXC signals
Baseband troubleshooting
3495.6 MHz (GSM1800)
Level>–10dBm *
*When 1kOhm passive probe is used,
correct measurement result by +26dB
Synthesizer troubleshooting
Check modulator
output components
OK?
Replace HAGAR
Yes
Replace
faulty components
No