User Guide

NSD-5
10. Troubleshooting PAMS Technical Documentation
Page 10 Nokia Corporation Issue 1 05/02
Troubleshooting Instructions
The first thing to do is to carry out a thorough visual check of the module. Make sure
that there is no mechanical damage and that solder joints are okay. Most failures will be
the result of SMD errors. Common errors include: solder placed where it shouldn’t be,
parts sliding off their pads, or parts placed incorrectly. A good visual inspection will pin-
point a large percentage of failing phones.
Before changing anything, also check all supply voltages and the system clock/sleep
clock.
The Troubleshooting Instructions section contains five modules:
- How to check/fix the system/sleep clock
- How to check/fix the power supplies
- How to check/fix the flashing faults
- How to check/fix the audio faults
- How to check/fix the charger faults