Change The Contrast on My CEM+

To change the contrast of the LCD display on a CEM+ with a blue main circuit board:

Press and hold the double back arrow (<<) and use the plus (+) and minus (-) keys to change values.

Changing the contrast of the LCD display on a CEM+ with a green main circuit board requires adjustments on the interior circuit board under power so it should only be performed by a trained service technician.