User Guide
Table Of Contents
- 6-Troubleshooting
- Table of Contents
- Introduction to NMM-3 Troubleshooting
- General guidelines for NMM-3 trouble shooting
- Diagnostics
- Phone is Dead
- Flash Programming Fault
- SIM Card Fault (Insert SIM / Card Rejected)
- Keypad Fault
- Display Fault
- Illumination Fault
- Charger Fault
- Accessory Fault
- Audio Fault
- Camera Fault
- USB Fault
- GSM900/1800 TX Troubleshooting
- HELGO Troubleshooting
- PA and Antenna Switch Troubleshooting
- GSM900 RX Troubleshooting
- GSM1800 RX Troubleshooting
- GSM900/1800 Synthesizer Troubleshooting
- WCDMA Tx Troubleshooting
- PA and DC-DC Converter Troubleshooting
- WCDMA Rx Troubleshooting
- WCDMA Rx Synthesizer Troubleshooting
- WCDMA Tx Synthesizer Troubleshooting
- GSM/WCDMA Antenna Troubleshooting
- Test Points
- Calibration required when components changed
- BACK TO MAIN PAGE
CCS Technical Documentation 6-Troubleshooting
Company Confidential NMM-3
Issue 1 (11/2003) Copyright 2003 Nokia Corporation Page 6-19
Company Confidential
PA and Antenna Switch Troubleshooting
Check with RF probe
+4dBm 900MHz
-4dBm 1800MHz
Check with oscilloscope:
Check Ant Switch
GSM VANT-2 = 2.6V pulse
GSM VANT-1 = 2.6V pulse
OK ?
Check VANT line components
L638/L639/C551/352
OK ?
Check with oscilloscope:
VBatt = 3.8V
VCC1 = VCC2 = VCC3 = 3.8V
VTXLO-G= 2.8V pulse (0V GSM1800)
VTXB-G= 2.8V pulsed (0V GSM1800)
VTXB-D= 2.8V pulsed (0V GSM900)
OK ?
Check components
around PA
OK ?
Replace faulty
component
Replace HELGO
Replace PA
Replace faulty
component
Replace ant.
switch
Yes
Yes
No
Yes
Yes
Yes
No
No
No
Yes
OK ?