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 6-21
Company Confidential
GSM1800 RX Troubleshooting
Y
es
Y
es
No
No
No
No
Y
es
Apply a –85dBm
1842.86771MHz signal
from generator to RF
connector
Scope at
GRXI/GRXQ
Signal 1.3Vpp
DC Offset=1.2V
Freq=67.7KHz
1800MHz
Chain
Functional
Change
generator
level to
–50dBm
Is spectrum analyser
ant switch output
-54dBm?
Spectrum analyser
ant switch input
-51dBm
Check C575 &
RF connector
Spectrum
analyser
V
CO Output
3685.6MHz
-20dBm
Scope
V
ant_1 =0V
In Rx mode
Check
Ant Switch
Check
Helgo
Y
es
Y
es
Y
es
Y
es
Y
es
Spectrum analyser
Helgo inputs
-55dBm
Check
V
R2,VR3,VR4,VR5=2.8V
Helgo serial interface
HELGO
Troubleshooting
Baseband
Troubleshooting
Synthesizer
troubleshooting
No
No
Y
es
Y
es
Check
L635,L636
No
Phoenix Settings:
Band:GSM1800
Active unit:RX
Op Mode:Continuous
Rx/Tx Chan:700
AGC:maximum (default)