Casio QV-300 (B) Service Manual & Parts List page 14

To assemble the main unit
1. Be sure to turn the lever to "TELE".
2. Be sure to align the lever of the outer case with the
knob of the lens.
3. Confirm if the lens is switched by the lever.
4. Be sure to align the switch knobs of the cover with
the switches.
Knob
Lens
Lever
Switch knob
— 12 —
Lever
Switch