User Guide
Table Of Contents
- 7 - RF Description & Troubleshooting
- 1. RF Description and Troubleshooting
- 2. RF Implementation in NHL-12
- 3. Introduction to RF troubleshooting
- 4. Receiver Description and Troubleshooting
- 5. Transmitter Description and Troubleshooting
- 6. Additional Information on EDGE Troubleshooting
- 7. Synthesizer Description and Troubleshooting
- BACK TO MAIN PAGE
Issue 2 10/2004 COMPANY CONFIDENTIAL 33
Copyright © 2004 Nokia. All Rights Reserved.
NHL-12
7 - RF Description & Troubleshooting Nokia Customer Care
Figure 16:Helgo EDGE troubleshooting
No
Yes
No
Yes
Yes
No
Helgo EDGE
troubleshooting
Check with oscilloscope:
-TXI/TXQ signals
-VR1 = 4.8V and VR2, VR4, VR5, VR6 = 2.8V
-VrefRF01 = 1.35V
-Helgo serial interface
-TXP & TXC & TXA
OK?
Baseband
troubleshooting
Check with RF probe:
4G VCO signal output:
-3589.6MHz (GSM900)
-4495.6MHz (GSM1800)
-376Hz (GSM1900)
Level > - 10dBm
OK?
Synthesizer
troubleshooting
Check modulator output components
and VPECTRL3 signal
OK?
Replace HELGO
Replace faulty
component(s)
-3346.4MHz(GSM850)
-3495.6MHz(GSM1800)
-3760MHz(GSM1900)
-3760MHz(GSM1900)
Level > - 10dBm
OK?