Optimus 120-2154 - Manual (Page 21)

To repeat a track, press RPT/2 during play. RPT appears during repeat
play. When the track ends, it automatically repeats.
To stop repeating the track and resume normal play, press RPT/2. RPT
disappears.
SCANNING THE TRACKS
You can set the stereo to play the first 10 seconds of each track on the
loaded CD, so you can find the track you want to listen to.
To begin scanning, press SCN/3. SCN appears during scanning.
To stop scanning, press SCN/3 again at the desired track to resume normal
play. SCN disappears.
SWITCHING BETWEEN THE CD AND THE RADIO
You can temporarily stop a CD and listen to the radio by pressing BND.
The CD stops and the radio tunes to the last station selected.
To continue playing the CD from the point where you stopped it, press CD.