Nokia 2220 Servicehandbuch

CCS Technical Documentation

Troubleshooting Instructions

RH-42

Issue 2 09/2003

Nokia Corporation          Confidential

Page 3

General testing........................................................................................................... 5
Troubleshooting ........................................................................................................ 5
Power up faults.......................................................................................................... 6
Flash Programming does not work.......................................................................... 10
Charging .................................................................................................................. 12
Audio failures.......................................................................................................... 13
Accessory detection................................................................................................. 16
Sleep Clock ............................................................................................................. 17
Display/Keyboard lights do not work ..................................................................... 18
Display does not work............................................................................................. 19
Buzzer does not work.............................................................................................. 20
Keyboard does not work ......................................................................................... 20

General instructions for RX troubleshooting .......................................................... 20
Path of the received signal ...................................................................................... 20
Fault-finding charts for receiver chain .................................................................... 21

19.44 MHz reference oscillator............................................................................... 28
RX VHF .................................................................................................................. 29
Fault-finding chart for RX VHF VCO  ................................................................... 30
TX VHF................................................................................................................... 30
UHF Synthesizer ..................................................................................................... 31