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 27
Copyright © 2004 Nokia. All Rights Reserved.
NHL-12
7 - RF Description & Troubleshooting Nokia Customer Care
Figure 14:PA and antenna switch troubleshooting
Yes Yes
Yes No
Yes No
Yes
No
Yes
No
PA & ant switch
troubleshooting
Check with RF probe signal level on PA
input >= 0dBm
OK?
Check with oscilloscope:
-VANT1 (GSM850)
-VANT2 (GSM1800)
-VANT3 (GSM1900)
OK?
Replace ant.
switch
Check with oscilloscope:
-VBATT ~4V
-VTXB = 2.8V pulsed
-VPCTRL_850/1800/1900
OK?
Check VANT line
components
OK?
Replace PA
Replace
HELGO
Replace faulty
component(s)
Check components
around PA
OK?
Replace faulty
component(s)