Scan-Graphics CF Series Maintenance Manual page 73

<I> Zoom In
Zoom factor increases by a factor of 2 each time this key is pressed.
Maximum zoom factor is 64.
<O> Zoom Out
Zoom factor decreases by a factor of 2 each time this key is pressed. No effect if
zoom factor is 1.
left & right arrow keys Selector Movement
These keys move the selector left and right. The selector wraps around at both ends of
the display.
Other keys exit to the Camera System Diagnostics menu.
5.1.14.21 X : Exit
Press <X> for "Exit" to return to the Diagnostic Tests menu.