Nokia 3310 Service Bulletin 028

CONFIDENTIAL 1 (2)

Nokia Mobile Phones Service Bulletin No. SB-028/24.04.01
Technical Support, Europe & Africa

NHM-5

AUTO TURN OFF

Some transceivers are observed to suffer from intermittent ’Auto turn off’.
Symptoms of this can be following:

Phone switches off by itself

- Even with 3 or 4 battery bars and after turn on again it is possible to make
a call for a longer period

- Typically it fails repeatedly with intervals of anything from minutes to one
or two days

- This should not be mixed up with the normal Battery Low turn off

The following component should be changed in phones suffering from that
’Auto turn off’ symptom:

ITEM CODE DESCRIPTION
DEL R301 1620105 RES NETWORK 0W06 2X2K2 J 0404
ADD R301 1620017 RES NETWORK 0W06 2X100R J 0404

Above mentioned change has been done in production since following
HWIDs:

MODULE HWID
UP4IV (0201741) 0813
UD4 (0201476) 0814
UG4 (0201677) 0815

Above mentioned component change is primary correction. As secondary
correction it can be checked, which Flash IC has been used.

In few cases the ’Auto turn off’ symptom can be caused also by old ST flash
i.e. from before week 05/2001, and therefore it is recommended that only
ST flashes from week 05/2001 or later are used. INTEL flashes can be also
used, as those are not seen to cause any that kind of symptoms.

NHM-5 SB-028

Instructions how to check the weekcode from ST flash can be found in
APPENDIX I.

APPENDIX I

For 0.25µ device the weekcode is in the second line from the bottom. Format
of the weekcode is "YYWW". In picture below that line is "0022", so it means
that the flash is from week 22 in year 2000.

CONFIDENTIAL 2 (2)

For 0.18µ device the weekcode is in the second line from the bottom. Format
of this weekcode is "xxxxxxYYWW", where x is not relevant information in
this case. In picture below the flash is from week 39 in year 2000.

NHM-5 SB-028