Advertisement
1+0
+DJDU WURXEOHVKRRWLQJ
HAGAR troubleshooting
Check with oscilloscope
–TXI/TXQ signals
–VR2, VR4, VR6 = 2.7V
-VrefRF01, VrefRF02 = 1.35V
-HAGAR serial interface
-TXP & TXC signals
OK?
Yes
Check with RF probe
4G VCO out signal
3589.6 MHz (GSM900)
3495.6 MHz (GSM1800)
Level>–10dBm *
OK?
Yes
Check modulator
output components
OK?
No
Replace
faulty components
3DJH
)LJXUH +DJDU WURXEOHVKRRWLQJ
No
Synthesizer troubleshooting
No
*When 1kOhm passive probe is used,
correct measurement result by +26dB
Yes
&RS\ULJKW È1RNLD $OO ULJKWV UHVHUYHG
&&6 7HFKQLFDO 'RFXPHQWDWLRQ
Baseband troubleshooting
Replace HAGAR
,VVXH
Advertisement
