User Guide

PAMS Technical Documentation 10. Troubleshooting
NSD-5
Issue 1 05/02 Nokia Corporation Page 3
Contents
Page No
Troubleshooting ............................................................................................................. 5
Baseband Troubleshooting............................................................................................. 5
Main Circuit Sections..................................................................................................... 5
Power Circuitry ............................................................................................................5
CCONT ........................................................................................................................5
Vbat ..............................................................................................................................5
Vref ..............................................................................................................................5
Linear Regulators .........................................................................................................5
1. Vbb........................................................................................................................ 5
2. RF Regulators (VR1–VR7)................................................................................... 6
3. V2V (VMAD) ....................................................................................................... 6
Switch mode regulator .................................................................................................6
1. V5V (+5V_POWER) ............................................................................................ 6
2. VSIM (3V_5V) ..................................................................................................... 6
A/D Conversion......................................................................................................... 6
Watchdog .................................................................................................................. 7
Serial bus................................................................................................................... 7
Clocks ..........................................................................................................................7
Sleep Clock ............................................................................................................... 7
System Clock............................................................................................................. 7
CDMA clock ............................................................................................................. 7
Charging Circuit ..........................................................................................................7
CAFE ...........................................................................................................................8
Microphones.............................................................................................................. 8
Earpiece and XEAR .................................................................................................. 8
Transmit and Receive RF Signals ............................................................................. 8
MAD4 ..........................................................................................................................8
DSP............................................................................................................................ 8
MCU.......................................................................................................................... 9
Memories .....................................................................................................................9
Troubleshooting Instructions ....................................................................................... 10
Check System Clock ............................................................................................... 11
Check Sleep Clock .................................................................................................. 12
In the Field .............................................................................................................. 12
Power Supplies........................................................................................................ 12
Phone is Totally Dead ................................................................................................13
Phone Won’t Power Up .............................................................................................13
Power Doesn’t Stay on or Phone is Jammed .............................................................14
Flash Programming Fails ...........................................................................................14
Audio failures ............................................................................................................14
Battery Will Not Charge ............................................................................................18
Baseband Test Points .................................................................................................19
Baseband Test Point Layout (Top side view) ............................................................21
Baseband Test Points Layout (Bottom side View A) ................................................22
Baseband Test Points Layout (Bottom side View B) ................................................23
RF Troubleshooting ..................................................................................................... 24
Purpose ......................................................................................................................24