Service Manuals, User Guides, Schematic Diagrams or docs for : NOKIA Mobile Phone Nokia_3310 NHM5-029

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                                                   CONFIDENTIAL                    1 (3)




Nokia Mobile Phones                                Service Bulletin No. SB-029/25.04.01
Technical Support, Europe & Africa

                                                   NHM-5


BROKEN C508

               If the end user complains of following symptoms:
               - dropped calls
               - no service
               - poor downlink audio
               - poor performance in weak fields etc

               and then in service point following symptoms can be found:
               - the phone may have difficulties to make location update/go in to service
                  on GSM tester, if the RF level is low
               - RX sensitivity is very poor
               - the BER can be alternating between very high % and 0%, if RF level is
                  below -65dBm
               - the problem can be seen in both GSM900 and GSM1800 bands

               it is likely that C508 (4x100 nF capacitor array 0508) is broken and needs to
               be changed.

               ITEM           CODE              DESCRIPTION
               C508           2315105           CHIP ARRAY X5R 4X100N M 10V


               Verification

               It is simple to verify if broken C508 causes the problem by measuring the
               RX I and Q signals with oscilloscope. Oscilloscope should be set to 1ms/div
               and 500mV/div and appropriate Probe should be used. Note: It is not
               recommended to use a simple Voltmeter to do this verification.

               Test points

               The RX I and Q signals can be measured on PWB in two ways, on the
               topside (component side) and on the bottom side (keypad side)




NHM-5 SB-029
                                                  CONFIDENTIAL                   2 (3)




               Top side




               Bottom side

               The two vias highlighted in above picture can also be measured from the
               bottom side of the PWB. (In this case it is not necessary to remove the
               shielding can lid, but the lightguide can not be used)

               Measurement procedure

               1. Place the PWB in MJS-19 Module Repair Jig
               2. Turn the phone on and set it to local mode with WinTesla
               3. Select RX BURST mode in RF controls menu. No external signal is
                  needed
               4. Measure RX I and Q signals with Oscilloscope




NHM-5 SB-029
                                                    CONFIDENTIAL                      3 (3)




               Measurement reference

               In case that C508 is not faulty both RX I and Q signals should look like the
               following picture




               In case that either RX I or Q or both signals looks like the below picture,
               C508 is broken and should be replaced.




NHM-5 SB-029

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