Optimus 120-1998 - Manual (Page 9)

Stereo Cassette (120-1998) Control Panel Faxback Doc. # 6926
The stereo's control panel must be in place for the stereo to operate.
When you remove it, the clock will display, but the stereo cannot be used.
This is a simple, but effective, security feature
REMOVING THE CONTROL PANEL
1. Push down DOWN ARROW until you hear a click. The control panel swings
out.
2. Remove the control panel, then store it in the supplied case.
REINSTALLING THE CONTROL PANEL
1. Gently squeeze the sides of the supplied case until the control panel
pops out.
2. Insert the right edge of the control panel into the right edge of the
recess. Make sure the pins in the recess fill the holes in the edge
of the control panel.
3. Gently push the left edge of the control panel into the recess until
you hear a click.