Sony A845 Operation Manual page 128

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Troubleshooting
The date and time have been reset.
 If you left the player for a while with the battery used up, the date and time may be
reset. This is not a malfunction. Charge the battery until
(  p. 19), and set the date and time again (  p. 22, 106).
Noise is generated when plugging or unplugging the headphones.
 Take off the headphones when plugging or unplugging the headphones. If you plug
or unplug the headphones while playing a song or using the Noise Canceling
function, you may hear noise from the headphones. This is not a malfunction.
appears on the screen