Sony CDX-M730 Operating Instructions (XT-XM1) Operating Instructions Manual page 31

If these solutions do not help improve the
situation, consult your nearest Sony dealer.
Messages
LCL Seek +/–
The Local Seek mode is on during automatic
tuning (page 14).
NO AF
There is no alternative frequency for the
current station.
" " or "
You have reached the beginning or the end of
the disc and you cannot go any further.
"
31