User Guide

Table of Contents
Troubleshooting baseband.........................................................................................................................................................6–5
Troubleshooting dead or jammed phone..............................................................................................................................6–6
BB self test tools.............................................................................................................................................................................6–7
Troubleshooting flash programming......................................................................................................................................6–7
General power troubleshooting.............................................................................................................................................6–10
Baseband serial interface troubleshooting ........................................................................................................................6–11
CBUS interface.........................................................................................................................................................................6–11
FBUS interface.........................................................................................................................................................................6–13
MBUS interface........................................................................................................................................................................6–14
Troubleshooting charger interface........................................................................................................................................6–15
Energy management calibration............................................................................................................................................6–17
Baseband troubleshooting tips...............................................................................................................................................6–17
Backup battery troubleshooting.............................................................................................................................................6–18
Troubleshooting USB interface...............................................................................................................................................6–19
SIM card fault................................................................................................................................................................................6–20
“Insert SIM Card” in device display although card is inserted.......................................................................................6–22
Troubleshooting keypad interface.........................................................................................................................................6–25
Troubleshooting the display....................................................................................................................................................6–26
Troubleshooting display and keyboard backlight............................................................................................................6–27
Troubleshooting MMC interface..............................................................................................................................................6–27
Audio troubleshooting...............................................................................................................................................................6–29
Troubleshooting internal microphone...........................................................................................................................6–29
Troubleshooting external microphone..........................................................................................................................6–30
Troubleshooting internal earpiece..................................................................................................................................6–30
Troubleshooting external earpiece..................................................................................................................................6–32
Troubleshooting IHF.............................................................................................................................................................6–33
Troubleshooting accessory detection...................................................................................................................................6–35
Troubleshooting IrDA.................................................................................................................................................................6–37
Troubleshooting FM radio.........................................................................................................................................................6–37
Tuning baseband.........................................................................................................................................................................6–39
Testing and tuning BB after component replacement....................................................................................................6–40
Testing interfaces........................................................................................................................................................................6–40
List of Tables
Table 4 Maximum tolerances....................................................................................................................................................6–18
Table 5 Calibration value limits................................................................................................................................................6–40
Table 6 Testing and flashing interface electrical specifications....................................................................................6–40
List of Figures
Figure 82 Main troubleshooting diagram...............................................................................................................................6–5
Figure 83 Dead or jammed phone troubleshooting............................................................................................................6–6
Figure 84 BB self tests....................................................................................................................................................................6–7
Figure 85 Flash programming troubleshooting, part 1......................................................................................................6–8
Figure 86 Flash programming troubleshooting, part 2......................................................................................................6–9
Figure 87 General power troubleshooting, part 1.............................................................................................................6–10
Figure 88 General power troubleshooting, part 2.............................................................................................................6–11
Figure 89 CBusClk test point......................................................................................................................................................6–12
Figure 90 CBUS test points.........................................................................................................................................................6–12
RM-51
Baseband troubleshooting Nokia Customer Care
9238460 (Issue 1) Company Confidential Page 6–3
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