Table of Contents
General baseband troubleshooting......................................................................................................................4–5
Important test points .......................................................................................................................................4–5
Flash programming does not work.................................................................................................................4–5
Phone doesn't switch on ..................................................................................................................................4–7
Switch off ..........................................................................................................................................................4–8
Display shows "Contact Service"......................................................................................................................4–8
The phone does not register to the networks, or the phone can not make a call.....................................4–9
SIM related faults................................................................................................................................................. 4–10
Insert SIM card fault....................................................................................................................................... 4–10
SIM card rejected............................................................................................................................................ 4–11
User interface....................................................................................................................................................... 4–12
Blank display................................................................................................................................................... 4–12
Display is corrupt............................................................................................................................................ 4–12
Dead keys ........................................................................................................................................................ 4–13
No backlight for display or keys ................................................................................................................... 4–13
Audio troubleshooting........................................................................................................................................ 4–15
Audio troubleshooting using phoenix......................................................................................................... 4–15
Check microphone using "Hp microphone in Ext speaker out" loop ........................................................ 4–16
Check earpiece using "Ext microphone in Hp speaker out" loop .............................................................. 4–16
Check IHF function using "Ext microphone in IHF speaker out" loop ....................................................... 4–17
Check vibra function using "Vibra control".................................................................................................. 4–17
Earpiece fault.................................................................................................................................................. 4–18
IHF/ringing tone fault.................................................................................................................................... 4–19
Microphone fault ............................................................................................................................................ 4–20
List of Figures
Figure 8 Test points for power suppliers.............................................................................................................4–5
Figure 9 Flash programming fault........................................................................................................................4–6
Figure 10 Troubleshooting when the phone doesn't switch on.......................................................................4–7
Figure 11 Switch off troubleshooting ..................................................................................................................4–8
Figure 12 Troubleshooting when the "Contact Service" message is seen .......................................................4–9
Figure 13 No registering or call ......................................................................................................................... 4–10
Figure 14 Insert SIM card fault........................................................................................................................... 4–11
Figure 15 Signal diagram ................................................................................................................................... 4–11
Figure 16 Signal diagram ................................................................................................................................... 4–12
Figure 17 Blank display....................................................................................................................................... 4–12
Figure 18 Display is corrupt................................................................................................................................ 4–13
Figure 19 Dead keys............................................................................................................................................ 4–13
Figure 20 No backlight for display or keys ....................................................................................................... 4–14
Figure 21 Phoenix audio test window.............................................................................................................. 4–15
Figure 22 PWB audio test points ....................................................................................................................... 4–16
Figure 23 Test arrangement for microphone................................................................................................... 4–16
Figure 24 Test arrangement for earpiece......................................................................................................... 4–17
Figure 25 Checking IHF function by using "Ext microphone in IHF speaker out" loop................................. 4–17
Figure 26 Checking vibra function by using vibra control .............................................................................. 4–18
Figure 27 Earpiece fault flow chart ................................................................................................................... 4–18
Figure 28 IHF/ring tone fault flow chart ........................................................................................................... 4–19
Figure 29 Microphone fault flow chart.............................................................................................................. 4–20
RM-305; RM-306
Baseband troubleshooting
Issue 2 COMPANY CONFIDENTIAL Page 4 –3
Copyright © 2007 Nokia. All rights reserved.
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