Drawer Circuit; Buzzer Circuit - Olivetti ECR 7100 Service Manual

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4-10 DRAWER CIRCUIT

The drawer is activated using the signal P51 from the CPU.
This signal is normally Low, and goes High to cause the drawer to run. When P47 is High,
Q5 is on.
Current flows through the transistor cause the collector to be held Low, near ground potential.
CN4
3
2
1
B3P-SHF-1AA

4-11 BUZZER CIRCUIT

The buzzer uses signal P31 from the CPU. This normally Low signal and goes High on 2 conditions.
First on an error tone, P31 goes High until the error condition is cleared.
For a key pip tone, P31 goes high and then return to its Low State. This pulse of extremely is short
duration.
54
VH
Q5
2SD986
R6
10K
VH
R24
0
BZ1
R31
KPT-GT1720-5V
4.7K
Q6
B
2SC1815
R7
10K
ECR7100 Service Manual
D6
RL102-E
R30
B
4.7K
BZ+
BZ-
R32
4.7K
DRAWER_ON
BUZZER
Y110910 - 8