Read Sharp ER-A310 (serv.man2) Service Manual online
2) Print wheel drive circuit
The stepping motor is used to drive the printer wheel.
The common signal SCOM from the CPU is used to supply voltage
VP to the stepping motor with the switching operation of transistor
Q19, and the stepping motor solenoid drive signal is used to operate
the stepping motor.
VP to the stepping motor with the switching operation of transistor
Q19, and the stepping motor solenoid drive signal is used to operate
the stepping motor.
3) Print solenoid drive circuit
Since the address bus is used to drive the print solenoid, an access to
the RAM cannot be performed during printing. The common voltage
of the print solenoid is supplied by switching operations of transistors
Q23 and Q19 with the HCOM signal.
the RAM cannot be performed during printing. The common voltage
of the print solenoid is supplied by switching operations of transistors
Q23 and Q19 with the HCOM signal.
4) Paper feed solenoid and stamp solenoid drive
circuit
PF:
Paper feed solenoid drive signal (Receipt side)
JF:
Paper feed solenoid drive signal (Journal side)
STAMP: Stamp solenoid drive signal (Receipt side)
5) Timing signal circuit
5. Printer motor drive circuit (ER-A330)
1) Printer motor drive and brake circuit
The printer motor is operated by switching operation of transistor Q17
with the motor drive signal MD from the CPU.
with the motor drive signal MD from the CPU.
VP : +24V
IC2
CPU
R74
1K
Q19
B888
M
A
B
C
D
PM2
PM1
PM3
PM4
STEPPING MOTOR
SM1
SM2
SM3
SM4
IC7B
KID65003P
IC7A
KID65003P
IC7C
KID65003P
IC7D
KID65003P
D29
1SS133
IC7F
KID65003P
R63
4.3K
4.3K
PCOM
VCC
SCOM
/R ESET
IC2
CPU
VP : +24V
IC7G
KID65003P
Q19
KTD 2060
HCOM
IC9
MAC16
IC 10
MAC16
IC11
MAC16
Q23
A1266
R70
3.3K
R69
18K
18K
R85
4.7K
R86
4.7K
R87
4.7K
R88
4.7K
R89
4.7K
R90
4.7K
R91
4.7K
R92
4.7K
R93
4.7K
R94
4.7K
R95
4.7K
R96
4.7K
AD5
AD4
AD3
AD2
AD1
AD0
A5
A4
A3
A2
A1
A0
RM6
RM4
RM3
RM5
RM2
RM1
JM6
JM5
JM1
JM2
JM4
JM3
HM COM
HM COM
IC2
CPU
IC6
KID65003P
RM6
RM4
RM3
RM5
VP: +24V
HM COM
JF
RF
STAMP
IC2
CPU
T
STAMP
R
C20
100P
C21
100P
R66
1 K
R64
1 K
R65
4.7K
R67
4.7K
VCC:+5V
C22
10U/50V
+
Timing
generating
circuit
IC2
CPU
VP : +24V
Q17
B601
R78
470
470
IC6B
KID65003P
MD
R79
2.7K
R80
22K
C20
0.20 P
0.20 P
Q18
B9 26
R81
2.7K
VM
M
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