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
NHL-12
Nokia Customer Care 7 - RF Description & Troubleshooting
26 COMPANY CONFIDENTIAL Issue 2 10/2004
Copyright © 2004 Nokia. All Rights Reserved.
Figure 13:Helgo IC troubleshooting
No
Yes
No
Yes
Yes
No
Helgo
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 signals
OK?
Baseband
troubleshooting
Check with RF probe:
4G VCO signal output:
-3346.4MHz (GSM850)
-3495.6MHz (GSM1800)
-3760MHz (GSM1900)
Level > - 10dBm
OK?
Synthesizer
troubleshooting
Check modulator output components
OK?
Replace HELGO
Replace faulty
component(s)