Table of Contents
General baseband troubleshooting......................................................................................................................3–5
Key components................................................................................................................................................3–5
Power supply test points..................................................................................................................................3–5
Phone cannot be powered on (I).....................................................................................................................3–5
Phone cannot be powered on (II)....................................................................................................................3–7
Phone cannot be flashed..................................................................................................................................3–8
Easy flash programming does not work...................................................................................................... 3–10
Display shows "Contact Service"................................................................................................................... 3–12
The phone does not register to the networks, or the phone cannot make a call................................... 3–13
SIM related faults................................................................................................................................................. 3–15
Insert SIM card fault....................................................................................................................................... 3–15
SIM card rejected............................................................................................................................................ 3–16
User interface....................................................................................................................................................... 3–16
Blank display................................................................................................................................................... 3–16
Corrupted display ........................................................................................................................................... 3–17
Dead keys ........................................................................................................................................................ 3–17
No backlight for display or/and keys ........................................................................................................... 3–18
Audio troubleshooting........................................................................................................................................ 3–19
Audio troubleshooting using phoenix......................................................................................................... 3–19
Check microphone using "Hp microphone in Ext speaker out" loop ........................................................ 3–20
Check earpiece using "Ext microphone in Hp speaker out" loop .............................................................. 3–21
Check IHF & ringing tone function using "Buzzer"...................................................................................... 3–21
Check vibra function using "Vibra control".................................................................................................. 3–22
Earpiece fault.................................................................................................................................................. 3–23
IHF/ringing tone fault.................................................................................................................................... 3–24
Microphone fault ............................................................................................................................................ 3–25
Headset earpiece fault................................................................................................................................... 3–26
Headset microphone fault............................................................................................................................. 3–27
List of Tables
Table 4 Connector for External Audio Accessories ........................................................................................... 3–20
List of Figures
Figure 9 Troubleshooting when phone cannot be powered on .......................................................................3–6
Figure 10 Troubleshooting when phone does not stay on or phone is jammed ............................................3–7
Figure 11 Flash programming fault......................................................................................................................3–9
Figure 12 Easy flash programming fault........................................................................................................... 3–11
Figure 13 Troubleshooting when the "Contact Service" message is seen .................................................... 3–13
Figure 14 No registering or call ......................................................................................................................... 3–14
Figure 15 Insert SIM card fault........................................................................................................................... 3–15
Figure 16 Signal diagram ................................................................................................................................... 3–16
Figure 17 Signal diagram ................................................................................................................................... 3–16
Figure 18 Phoenix audio test window.............................................................................................................. 3–19
Figure 19 4-pole jack plug for audio accessory................................................................................................ 3–20
Figure 20 Test arrangement for microphone................................................................................................... 3–21
Figure 21 Test arrangement for of earpiece..................................................................................................... 3–21
Figure 22 Checking IHF and ring tone by using "Buzzer"................................................................................ 3–22
Figure 23 Checking vibra function by using vibra control .............................................................................. 3–22
RM-340; RM-341
Baseband Troubleshooting Instructions
Issue 1 COMPANY CONFIDENTIAL Page 3 –3
Copyright © 2007 Nokia. All rights reserved.
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