Sony CMD-J7 - Manual (Page 58)

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Appendix
Troubleshooting
Problem Possible Causes Possible Remedies
Unable to
switch on Empty battery Charge the battery (see page 13 ).
Defective battery Replace the battery. Note that after several years,
gradual decline is normal.
The icon
appears
Weak signal Move to an open space or nearer to a window.
Outside GSM coverage area Check operator coverage map.
SIM not valid Call your service provider.
Network access not allowed Try manual network search (see page 36 ).
Call not
possible Dialling error Use full national area code. When abroad, use also
international access code to reach home country.
All calls barred Check settings (Password is needed to clear).
Another SIM inserted Check for new restrictions.
Call barring set Check outgoing call barring settings (see page 38 ).