Service Manuals, User Guides, Schematic Diagrams or docs for : NOKIA Mobile Phone Nokia_3210 NSE8-028

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>> Download NSE8-028 documenatation <<

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                                                    CONFIDENTIAL                      1 (1)




Nokia Mobile Phones                                 Service Bulletin No. SB-028/02.02.00
Technical Support, Europe & Africa

                                                    NSE-8


HIGH KEYPRESS FORCE

               Due to a process change at the PCB vendor, PCBs were produced with a too
               high solder mask.

               When the solder mask is too high, the symptom to the customer is a bad
               working keypad, especially the middle keys (NaviKey, 2, 8, and 0), more
               keypress force is needed to activate the key.

               The height of the solder mask varies, so in some cases it requires a high
               keypress force, and in some cases no problem is observed.

               When the solder mask is too high the keydome itself rests on top of the
               solder mask, instead of making electric contact to the keydome pad on the
               PCB, giving the feeling of a key click but without any indication in the display.

               These above mentioned PCBs have been used only in phones 'Made in
               Finland' within below IMEI range:

               First: 448903/10/729000/0
               Last: 449142/10/432508/8

               These PCBs can be identified by the double arrow symbol ( ) between the
               keypads used for key 3 and 4 on the PCB.

               New modified keydome sheet is available at the beginning of March, 2000.

               Until above repair solution is available, all units returned due to above
               symptoms within above mentioned IMEI range, need to be exchanged.
               Changed units should not be scrapped, but stored up until new keydome is
               available. Thereafter these units can be used for swap purposes.




NSE-8 SB-028

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