Nokia RA-8 Rf Description And Troubleshooting page 36

Nokia Customer Care
Honi EDGE troubleshooting diagram
HONI EDGE
Helgo EDGE
troubleshooting
Check with oscilloscope:
-TXI/TXQ signals
- VR2, VR5, VR6 = 2.8V
-VR1, VR2, VR4, VR5, VR6 =2.8V
-VrefRF01 = 1.35V
-Honi serial interface
-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
OK?
No
Replace faulty
component(s)
36
No
No
Yes
COMPANY CONFIDENTIAL
Copyright © 2005 Nokia. All Rights Reserved.
7 - RF Description and Troubleshooting
Baseband
troubleshooting
Synthesizer
troubleshooting
Replace HELGO
RA-8
HONI
Issue 1 11/05