Casio IT-2000 Service Manual page 20

5.2.3 LCD Contrast control
LCD contrast is controlled by KBC.
Use a function of KBC, A/D converter to measure the temperature with a temperature sensor. Then give
the measured data (10 bits AD value) to the system. According to the value system returns the contrast
data to KBC.
KBC adjusts LCD contrast by contrast data.
LCD contrast diagram is shown in Figure 5.2.3.1.
LCD contrast adjustment is shown in Figure 5.2.3.2.
Figure 5.2.3.1 LCD Contrast control diagram
Figure 5.2.3.2 LCD contrast adjustment sequence
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