Sony CDX-GT52W Operating Instructions Manual page 18

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The character cannot be displayed with the unit.
*1 The disc number of the disc causing the error
appears in the display.
*2 If an error occurs during playback of a CD or MD,
the disc number of the CD or MD does not appear
in the display.
If these solutions do not help improve the situation,
consult your nearest Sony dealer.
If you take the unit to be repaired because of CD
playback trouble, bring the disc that was used at the
time the problem began.
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