“OVER CURRENT” appears.
A problem has been detected with the
level of electrical current from the 
(USB) port . Turn off the system and
remove the USB device from the 
(USB) port . Make sure there is no problem with the USB device. If this display pattern persists, contact your nearest Sony dealer.
There is no sound.
The USB device is not connected correctly. Turn off the system and reconnect the USB device, then turn on the system and check if “USB MEM” lights up.
There is noise, skipping, or distorted sound.
Turn off the system, then reconnect the USB device.
The music data itself contains noise, or the sound is distorted. Noise may have entered during the transfer process or recording. Delete the track, and try transferring or recording again.
The bit rate used when encoding audio files was low. Send audio files with higher bit rate to the USB device.
The USB device cannot be connected into the 
(USB) port .
The USB device is being connected backwards. Connect the USB device in the correct orientation.
“READING” is displayed for an extended time, or it takes a long time before playback starts.
The reading process can take a long time in the following cases.
There are many folders, tracks or files on the USB device.
The file structure is extremely complex.
The memory capacity is excessive. The file size is extremely large. The internal memory is fragmented.
Thus, we recommend following these guidelines.
Total folders on USB device: 200 or less
Total tracks or files per folder: 150 or less
Erroneous display
Send the music data to the USB device again, as the data stored in the USB device may have been corrupted.
The character code that can be displayed by this system are as follows:
Upper cases (A to Z)
Numbers (0 to 9)
Symbols (< > * +, ? / [ ] \ _)
Other characters appear as “_”.