User Guide

2118 (RH-77)
Baseband Description and Troubleshooting Nokia Customer Care
Page 2 ©2005 Nokia Corporation Company Confidential Issue 01 04/2005
Contents Page
Introduction ..................................................................................................................................................... 3
Baseband and RF Architecture.................................................................................................................... 4
Power Up and Reset ....................................................................................................................................5
Power Up - Power Key............................................................................................................................. 7
Power Up - Charger ................................................................................................................................. 7
Power Up - RTC Alarm............................................................................................................................. 8
Power Off .......................................................................................................................................................8
Power Consumption and Operation Modes .........................................................................................8
Power Distribution ......................................................................................................................................9
Clock Distribution ......................................................................................................................................11
RFClk (19.2 MHz Analog)..................................................................................................................... 11
RFConvClk (19.2 MHz digital) ............................................................................................................ 13
CBUS Clk Interface ................................................................................................................................ 14
DBUS Clk Interface................................................................................................................................ 14
SleepCLK (Digital) .................................................................................................................................. 15
SleepCLK (Analog).................................................................................................................................. 15
Flash Programming Error Codes .............................................................................................................. 16
Charging Operation..................................................................................................................................... 18
Battery ..........................................................................................................................................................18
Charging Circuitry .....................................................................................................................................18
Charger Detection .....................................................................................................................................19
Charge Control ...........................................................................................................................................20
Audio .............................................................................................................................................................20
Display and Keyboard ...............................................................................................................................21
Flashlight.................................................................................................................................................. 21
Accessories ..................................................................................................................................................22
Charging................................................................................................................................................... 23
Pop-port Headset Detection.....................................................................................................
.......... 24
FBus Detection........................................................................................................................................ 24
Accessory Detection Through ACI..................................................................................................... 25
SIM CAR .......................................................................................................................................................26
Test Points...................................................................................................................................................... 28
Troubleshooting............................................................................................................................................ 30
Mobile Terminal is Dead ..........................................................................................................................31
Flash Programming Does Not Work .....................................................................................................32
Power Does Not Stay on or the Mobile Terminal is Jammed ........................................................34
Charger .........................................................................................................................................................36
Audio Faults ................................................................................................................................................37
Display Faults ..............................................................................................................................................41
Keypad Faults .............................................................................................................................................43
Flashlight .....................................................................................................................................................45