Service Manuals, User Guides, Schematic Diagrams or docs for : NOKIA Mobile Phone Nokia_3210 NSE8-037

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>> Download NSE8-037 documenatation <<

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                                                   CONFIDENTIAL                    1 (1)




Nokia Mobile Phones                                Service Bulletin No. SB-037/20.04.00
Technical Support, Europe & Africa

                                                   NSE-8


COBBA UNDERFILLING

               In some cases when NSE-8 is exposed to mechanical stress (dropped etc)
               WKH &2%%$ %*$ FRPSRQHQW 1 PD\ VXIIHU IURP FUDFNV EHWZHHQ WKH
               solder-balls and the pads on the PCB. Typical symptoms are dropping calls,
               loosing service or signal indicator is unstable on the display.

               As underfilling for COBBA is solution for those cases it has been taken in use
               in production since IMEI: 449143/10/716000/x.

               Note: It is not possible to rework or replace an underfilled COBBA
                %*$ FRPSRQHQW

               In case of phones without underfilling of COBBA:

               1. 5HPRYH WKH &2%%$ %*$ XVLQJ D %*$ &63 UHZRUN VWDWLRQ
               2. Inspect the number of oxidised pads "black pads" on the PCB under
                  COBBA (dark coloured pads). If there are more than 6 black pads then
                  scrap the PCB. Less than 7 black pads will ensure high reliability of
                  reworked component.
               3. Remove carefully excessive solder from the COBBA solder pads
               4. Apply flux to the COBBA solder pads (use a strong no-clean flux to
                  remove oxides)
               5. Mount a new &2%%$ FRGH  XVLQJ D %*$ UHZRUN VWDWLRQ 'R
                  not mount the removed COBBA!!)
               6. Re-build the phone IMEI and re-initialise the SIM locks
               7. Test and tune the phone's RF performance (COBBA stores RF A/D
                  values)




NSE-8 SB-037

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