Optimus 120-2117 - Manual (Page 10)

in, turn the tape over, then fast-forward the other side.
Using An External Component
You can connect a portable CD player or other audio component with a line
level output or headphone jack to the stereo.
To make this connection, you need a stereo mini-jack cable with a 1/8-inch
(3.5 mm) plug. Connect one end of the cable to the stereo's CD IN jack,
then connect the cable's other end to the output jack of the CD player or
component.
When you connect a CD player or other audio component then turn it on, you
hear the component's sound through your speakers. You can use the stereo's
controls to adjust the sound.
Notes: If you connect a CD player's or other audio component's headphone
jack to the stereo, adjust the audio component's volume to a low
level then adjust the stereo's volume to a comfortable listening
level.
When you connect a cable into the stereo's CD IN jack, the radio
and cassette player do not operate. Be sure you disconnect the CD
player when you are not using it.