Introduction; Adjusting Lcd Contrast And Brightness - GE AquaTrans AT868 Abridged Manual

Introduction

Adjusting LCD Contrast
and Brightness
Displaying Data
The AT868 is equipped with a Liquid Crystal Display (LCD), which
may be programmed to display up to four variables in sequence. Both
the brightness and the contrast of the LCD are easily adjusted by
following the instructions in this chapter. In addition, instructions are
provided for resetting the totalizers and pausing the measurements.
The AT868 has two adjustment potentiometers located on the LCD
circuit board (see Figure 3-1 below). To make contrast and brightness
adjustments, complete the following steps:
1. Loosen the screws and remove the front cover.
2. With power still applied to the meter, carefully use a small
screwdriver to adjust the BKLT (backlight) potentiometer. Turning
the control completely clockwise yields maximum brightness.
3. In a similar manner, adjust the CONT (contrast) potentiometer to
set the contrast as desired. At either extreme of the CONT control,
the display is unreadable. To make the adjustment, turn the control
fully counterclockwise and then turn it clockwise very slowly until
the display is clear and sharp.
4. As there is some interaction, readjust the BKLT control if necessary.
5. Replace the front cover and secure it in place with the screws.
Figure 3-1: CONT and BKLT Potentiometers
September 2004
CONT Potentiometer
BKLT
Potentiometer
3-1