Casio IT-2000 Service Manual page 18

5.2.2 Matrix key
5.2.2.1 Matrix key diagram
Matrix key diagram is shown in Figure 5.2.2.1.
KSENS[2:0] is connected to KEYIN#[2:0] of KBC.
KSCAN[4.0] is connected to a general port of KBC.
Figure 5.2.2.1 Matrix key diagram
— 16 —