Nokia 8850 Manual Do Serviço
NSM–2
Disassembly & Troubleshooting Instructions
Disassembly & Troubleshooting Instructions
PAMS Technical Documentation
Page 10
Issue 1 12/1999
Nokia Mobile Phones Ltd.
Troubleshooting
Troubleshooting instructions are divided into following sections:
How to check/fix the system/sleep clock.
How to check/fix the power supplies.
Contact service case.
How to check/fix the SIM faults.
How to check/fix the Audio faults.
How to check/fix the charger faults.
How to check/fix the power supplies.
Contact service case.
How to check/fix the SIM faults.
How to check/fix the Audio faults.
How to check/fix the charger faults.
The first thing to do is to carry out a thorough visual check of the module.
Make sure that:
Make sure that:
– there are no mechanical damages
– solder joints are OK
– solder joints are OK
Before changing anything ALL SUPPLY VOLTAGES AND SYSTEM
CLOCK / SLEEP CLOCK should be checked.
CLOCK / SLEEP CLOCK should be checked.
26MHz VCXO
G830
G830
HAGAR
N505
N505
Clock signal
buffer
V800++
buffer
V800++
MAD
C213
C213
/2
13MHz