Table Of Contents - Nokia 2255 Baseband Description And Troubleshooting

2255 (RM-97)
Baseband Description and Troubleshooting
Contents
Introduction ..................................................................................................................................................... 5
Power Up Sequence .................................................................................................................................... 6
Flash Programming ........................................................................................................................................ 8
Flashing Tool ................................................................................................................................................. 8
Flashing Troubleshooting what about this section? Is it needed? ..............................................10
Flashing Phoenix Interface........................................................................................................................ 12
Audio ............................................................................................................................................................... 13
How the Audio Works ..............................................................................................................................13
Audio Troubleshooting .............................................................................................................................14
Audio Phoenix Interface ..........................................................................................................................15
FM Radio ........................................................................................................................................................ 16
How the FM Radio Works .......................................................................................................................16
FM Radio Test .............................................................................................................................................16
FM Radio Troubleshooting ......................................................................................................................16
FM Radio Phoenix Interface ...................................................................................................................17
USB (Universal Serial Bus)......................................................................................................................... 19
How the USB Interface Works ...............................................................................................................19
USB Troubleshooting ................................................................................................................................20
Display ............................................................................................................................................................ 22
How the Display Works ............................................................................................................................22
Display Troubleshooting ..........................................................................................................................22
Display Backlight Troubleshooting .......................................................................................................23
Display Phoenix Interface .......................................................................................................................25
Keypad Backlight ......................................................................................................................................... 26
How the Keypad Backlight Works ........................................................................................................26
Keypad Backlight Troubleshooting .......................................................................................................26
Keypad Backlight Display Phoenix Interface .....................................................................................28
GPS................................................................................................................................................................... 29
How GPS Works .........................................................................................................................................29
GPS Troubleshooting ................................................................................................................................29
GPS Phoenix Interface ..............................................................................................................................32
UIM Card ........................................................................................................................................................ 33
How the UIM Card Works .......................................................................................................................33
UIM Card Troubleshooting ......................................................................................................................33
UIM Card Phoenix Interface ...................................................................................................................36
System Connector........................................................................................................................................ 37
Accessory Detection.................................................................................................................................... 38
Battery (Lynx) Interface Circuit ............................................................................................................... 39
Charging......................................................................................................................................................... 40
Common Problems ...................................................................................................................................... 41
No Communication During Flash ..........................................................................................................41
No Communication During Alignment ................................................................................................41
Failed Self Test/Calibrate .........................................................................................................................41
Mobile Terminal Not Powering Up .......................................................................................................41
Shut Down After 32 Seconds .................................................................................................................41
No Audio ......................................................................................................................................................42
Key Pads Malfunction ..............................................................................................................................42
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©2005 Nokia Corporation
Company Confidential ISSUE 1 10/2005