See also:

Symbols and messages in the display
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Removing the cover
1. Press one of the end pieces of the cover inward. 2. Pull the cover carefully upward and outward. The other end will release automatically from its retaining bracket. ...

External sound sources
USB flash drive To simplify the use of a USB flash drive, it is advisable to only store music files on the drive. It will take considerably longer for the system to index the files on the drive ...