Casio IT-2000 Service Manual page 22

5.2.5 Buzzer Control
KBC controls the volume of the buzzer and the sound of a key click.
Buzzer control diagram is shown in Figure 5.2.5.1.
Buzzer control signal is shown in Chart 5.2.5.2.
Signal
BZVR0 Controls volume of Buzzer
BZVR1 Controls volume of Buzzer
KEYBZ Controls sound of key click
SYSBZSW Activates system buzzer
SPKR Controls sound of system buzzer
BZ[2:0] Controls volume of Buzzer
Figure 5.2.5.1 Buzzer Control block diagram
Chart 5.2.5.2 Signals controlling buzzer
Function
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BZVR1 BZVR0 Volume
0 0 OFF
0 1 LOW
1 0 Medium
1 1 High