Trouble Shooting Guide, Standard
4/00021-2/FEA 209 544/19 E 28(29)
12 Other Problems
12.1 RTC
12.1.1 Figure out the fault
Start the phone with a SIM-card and a fully charged battery. Set the correct time. Remove the
battery and re-insert it after one minute.
If the phone clock says 00:00, go to section 12.1.2.
Compare to the correct time.
If the clock is halted or speeding, go to section 12.1.3.
12.1.2 The clock says 00:00 after re-inserting the battery
Open the phone and check for liquid damage.
Make sure that the backup capacitor (C720) and R700 are correctly soldered. Measure the
resistance of R700 (3.3 kohms).
If all are correct, replace C720.
If the resistance of R700 is incorrect replace it.
Assemble the phone, start it up and set the correct time. Wait a few minutes for the backup
capacitor to charge. Remove the battery and re-insert it after a minute. Make sure the fault has
been fixed (the backup capacitor needs 20 minutes of charging before reaching full capacity).
Compare to the correct time. If the clock is halted or speeding, go to section 12.1.3.
If the fault remains, send the unit on according to the local company directives.
12.1.3 The clock is halted or speeding
Open the phone and check the solder joints on B600.
If they are correct, replace B600.
If that does not help, replace C690 and C691.
Assemble the phone and compare to the correct time.
If the fault remains, send the unit on according to the local company directives.
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