Troubleshooting - Mitsubishi Electric M420i User Manual

Troubleshooting

PROBLEM POSSIBLE CAUSE AND SOLUTION
Phone does not
Check that the battery is fully charged and correctly connected to the phone.
switch on
Short standby
Cell broadcast is permanently on, using more battery power.
and talk times
Phone is in a poor signal area and therefore always on full power.
Incorrect charging and discharging. Always charge and discharge your battery
fully.
The battery is wearing out. Contact your dealer and replace the battery.
Impossible to dial
Keypad lock is on (
numbers
keypad lock off.
Impossible to
Check that at least one signal strength bar (
make or receive a
strength area.
call
If no network name is displayed, check registration and area coverage with your
service/network provider and check that the SIM is correctly inserted.
Call barring option is on. Deactivate it (see page 89). Call cost limit is reached
(see page 35).
Stored telephone
Fixed Dialled Number or Call Barring features are activated. Deactivate feature.
numbers cannot
(see page 89).
be recalled
The mobile is on
Display contrast is too low. Reset contrast (see page 82).
but nothing is
displayed.
No flashing
There may be no mains supply. Try a different electrical socket.
battery icon
The AC/DC charger may be faulty. Return to your dealer and try substitution with
whilst
another Mitsubishi Electric adaptor.
charging
Battery icon
May indicate a charge or battery problem. Disconnect the charger. Reconnect and
not flashing 1-2-
try again.
3-4-5 during
May also indicate that the battery is fully recharged and does not require any
charging
further charging.
No charge
If the battery is totally empty the battery level symbol may not be displayed at once
symbol when
when connecting the battery charger. Moreover the mobile cannot be turned on.
connecting the
Up to 15 minutes may be necessary to reach the required 4% battery charge to
charger
turn your mobile on and allow the battery charge symbol to be displayed.
symbol
There is not enough memory to store another mail or another MMS. Delete one
displayed
or more of the existing stored messages.
Flashing
There is not enough memory to store another SMS message. Delete one or more
of the existing stored messages.
appears). Press Unlock and the [Clear] key to turn the
) is displayed. Try a stronger signal
Appendix
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