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 6-11
Company Confidential
Illumination Fault
Start
Replace display module.
Do lights work?
No
Are the display
LED’s working?
No
Measure voltage on
V
400 Cathode.
Y
es
Check V400 and
L400. Are they OK?
Are the keypad
LED’s working?
~
18V
Y
es
Replace Display
Check X400 and
X
3 contacts and
solder joints.
OK?
Replace
defective part.
Y
es
No
Replace
N400
~
0V
Replace
defective part.
Y
es
No
Replace
N400
Replace UI-module. Do
lights work?
No
No
Measure voltage on
R426. Is it ~2.2V?
Retest
No
Y
es
Replace
Keypad
LEDs
Check X400 and
X
3 contacts and
solder joints.
OK?
Replace
defective part.
Y
es
No
Y
es
Measure voltage on
V
400 Cathode. Is
it
~10.5V?
Check V400 and L400.
Are they OK?
Y
es
Replace
N400
No
Replace
defective part.
No
Y
es
Replace
N402
End