Sharp AR-203E ユーザーズマニュアル

The scan head locking switch is under the original table. If the switch is locked (

), 

the unit will not operate. Unlock the switch (

) as shown below.

To lock the scan head locking switch, hold up the catch in illustration

 and

turn the center knob counter-clockwise 90 degrees until you hear a click.

A

Grasp here and turn in 
the direction of the arrow.