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
NMM-3 Company Confidential
6-Troubleshooting CCS Technical Documentation
Page 6-18 Copyright 2003 Nokia Corporation Issue 1 (11/2003)
Company Confidential
HELGO Troubleshooting
Y
es
Y
es
Check with RF FET Probe:
V
CO Output signal
3589.6Mhz CH37 (GSM900)
3495.6MHZ CH700 (GSM1800)
Level>-10dBm
OK?
No
No
Y
es
Check with scope/multimeter
TXI/TXQ Signals
V
R2,VR3,VR4,VR5,=2.8V
V
R1A=4.8V
V
REF01=1.35V
HELGA serial interface
TXP & TXC signals
OK?
Y
es
Check modulator output
components
OK?
Replace Helgo
Replace faulty
components
No
Phoenix Settings:
Band=GSM900
Active Unit=Tx
Op Mode=Burst
Tx Chan=37
PA Mode=Free
Pwr Lvl=19
Synthesizer
Troubleshooting
Baseband
Troubleshooting
HELGO