Nokia RH-30 Series Troubleshooting Instructions page 16

Helgo EDGE
ICQ: 343183001 QQ: 35070846 Email: Serviceic@yahoo.com.cn
troubleshooting
Check with oscilloscope:
-TXI/TXQ signals
-VR1, VR2, VR4, VR5, VR6 =2.8V
-VrefRF01 = 1.35V
-Helgo serial interface
-TXP & TXC & TXA
OK?
Yes
Check with RF probe:
4G VCO signal output:
-3346.4MHz(GSM850)
-3589.6MHz (GSM900)
-3589.6MHz(GSM900)
-3495.6MHz (GSM1800)
-3495.6MHz(GSM1800)
-3760MHz (GSM1900)
-3760MHz(GSM1900)
Level > - 10dBm
OK?
Level > - 10dBm OK?
Yes
Check modulator output components
and VPECTRL3 signal
OK?
No
Replace faulty
component(s)
Figure 8: Helgo EDGE troubleshooting
No
No
Yes
Baseband
troubleshooting
Synthesizer
troubleshooting
Replace HELGO