Sony VPL-CX21 Operating Instructions Manual page 38

Message
Lens control is locked! Do
you wish to unlock? Yes V
No v
38
Troubleshooting
Meaning and Remedy
"Lens Control" on the Installation menu is set to "Off."
c To enable the the LENS (FOCUS, ZOOM) key on the Remote
Commander, and the FOCUS and ZOOM keys on the projector,
set "Lens Control" to "On."