Read Sharp ER-A220 (serv.man2) Service Manual online
8. Paper take up motor drive circuit
When the MOTOR signal from the CPU is HIGH, Q1 is turned on to
operate the motor.
9. Drawer drive circuit
When the P60 signal from the CPU is HIGH, Q9 is turned on to
operate the solenoid.
10. Buzzer drive circuit
When the BUZ1 signal from the CPU is HIGH, Q6 is turned on to
operate the buzzer.
operate the buzzer.
11. Keyboard circuit
Four P10-13 signals from the CPU are converted into 16 strobe signals by two 74HC138 for use in various functions.
CPU
TA4IN/U
VLED
MOTOR
M
Q1
R46
R45
CN3
D115
CPU
/RST0
+24V
P60
Q9
R164
R163
CN6
C161
ICP103
1.0A
Micro Switch
Drawer
solenoid
C162
CPU
TA4OUT/U
VCC
BUZ1
BZ1
BZ
D7
Q3
CPU
P10-13
P92-97
Key
Matrix
Head up
sensor
HC138
P10-13
P10-13
/S8-9
/S0-7
/S0-9
P92-97
Mode
Switch
/S0-7
/S0-9
P91
Paper
feed key
/S1
Receipt
near end
sensor
/S3
/S4
RS232
/CI
signal
/S9
P91
Front
display
74HC374
a,b,c,d,e,f,g,dp
/CS3
Pop-up
display
G1',G2',
G3'G4',G5',
G6',PDSG7
(PDSG7:G7')
G3'G4',G5',
G6',PDSG7
(PDSG7:G7')
/S0 - 9
A',B',C',D',E',F',G',DP'
D0-7
D0-7
/CS3
P90
HC138
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