Sony CDX-M800 Operating Instructions Manual page 26

Push Reset
The CD/MD unit cannot be operated because
of some problem.
t Press the RESET button on the unit.
*1 When the CD/MD changer is connected to the unit,
the disc number of the CD or MD appears in the
display.
*2 The disc number of the disc causing the error
appears in the display.
*3 "Failure" (small case) and "FAILURE" (upper case)
are different messages.
If these solutions do not help improve the
situation, consult your nearest Sony dealer.
Messages
Local Seek +/–
The Local Seek mode is on during automatic
tuning (page 14).
" " or "
You have reached the beginning or the end of
the disc and you cannot go any further.
26
"