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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. 

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.

PF:

Paper feed solenoid drive signal (Receipt side)

JF:

Paper feed solenoid drive signal (Journal side)

STAMP: Stamp solenoid drive signal (Receipt side)

The printer motor is operated by switching operation of transistor Q17
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

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

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

IC6B

KID65003P

MD

R79

2.7K

R80

22K

C20
0.20 P

Q18

B9 26

R81

2.7K

VM

M

– 12 –

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 J-COM signal and the R-COM signal.

PF:

Paper feed solenoid drive signal (Receipt side)

JF:

Paper feed solenoid drive signal (Journal side)

STAMP: Stamp solenoid drive signal (Receipt side)

The timing signal 

α

 is delivered to the CPU by the photo transistor

attached to the printer. 

The solenoid is driven by switching operation of transistor Q14 with
the drive signal DR1 from the CPU. 

When an option drawer is used, the parts enclosed with the dotted
line must be attached to the PWB.

IC2

CPU

AD0

AD2

AD4

AD6

AD7

VP : +18V

Q19

B926

R82

2.7K

IC6C

KID65003P

J-COM

R83

220/2W

VJ

D28

1N4002

AD1

AD3

AD5

MG1 0

MG9

IC7B

IC7C

IC7G

IC8B

IC8D

IC7E

IC7D

IC7F

IC8C

IC8A

JM2

JM1

JM3

JM4

JM5

JM6

JM7

JM8

JM9

JM10

VP : +24V

Q20

B926

R84

2.7K

IC6E

KID65003P

R-COM

R85

220/2W

VR

D29

1N4002

AD0

AD2

AD4

AD6

AD7

AD1

AD3

AD5

MG1 0

MG9

IC8E

IC8F

IC9C

IC9E

IC9G

IC9A

IC8G

IC9B

IC9F

IC9D

RM2

RM1

RM3

RM4

RM5

RM6

RM7

RM8

RM9

RM10

IC2

CPU

RF

J F

STAMP

6

1

7

1

6

6

7

VM

IC2

CPU

STAMP

C30

100P

VCC:+5V

C29

10U/16V

α

IC2

CPU

VP : +18V

R53

1K

R54
15K

Q14

C3784

DR1

VP : +18V

R80

1K

Q17

C3784

DR2

DRS

R57

ER-A310:3.3K
ER-A330:4.7K

ER-A310:3.3K
ER-A330:4.7K

R55
15K

L2

STANDARD DRAWER

OPTION DRAWER

– 13 –

The keyboard performs key  scanning with the eight strobe signals
ST1-ST8, and returns the nine return signal KR1-KR9 to the CPU. 

The mode switch performs scanning with the eight strobe signals
ST1-ST8, and returns the return signal KR10 to the CPU. When the
mode switch is at SRV position, the reset signal /RESET is outputted.

The one hole cashier switch performs scanning with four strobe sig-
nals ST1 

∼

 ST4, and returns the return signal KR11 to the CPU.

The 7-segment LED is used in the display. The operator display uses
10 digit signals, and the pop-up display uses 7 digit signals. 

The battery voltage signal is inputted to the CPU  P10 and the com-
parison reference voltage VCC (+5V) is inputted to the CPU VREF to
monitor the battery voltage. When the input to P10 falls below
7/10VCC=+3.5V, the low battery display is made. 

IC2

CPU

ST8

ST6

ST4

ST2

ST1

ST7

ST5

ST3

KEY MATRIX

KR1

KR2

KR3

KR4

KR6

KR7

KR8

KR5

KR9

RA2

56K X 8

R102

56 K

D 9

D11

D13

D15

D16

D10

D12

D14

MODE SWITCH

ST1~ST8

/R ESET

KR10

C11

M104

R40
56 K

D17

1SS133

ST 1 ~ ST 4

KR 1 1

R5 2   56K

D 1 8~D 2 1

ONE HOLE

CASHIER KEY

DIG1'

DIG9'

DIG10'

DIG2'

A,B,C,D,E,F,G,DP

DP'

G'

F'

E'

D' C'

B'

A'

A',B',C',D',E',F',G',DP'

A',B',C',D',E',F',G',DP'

DIG1-DIG10

FND5

FND1

FND4,3,2

IC2

CPU

+6V

POP UP

DISPLAY

DIG1'-7'

Operator Display

DP~A

 REGURATOR

CIRCUIT

POWER

TRNSFORMER

F1

T1AL/250V

P-OFF

CIRCUIT

REGURATOR

CIRCUIT

BATTERY

CITCUIT

VP:+24V(ER-A310)

   +18V(ER-A330)

+6v

VCC:+5V

PE

VDD:+5V

: PRINTER, DRAWER

: DISPLAY

: CPU,RAM

VB

IC2

CPU

AVREF

P10

VB:+1.5V X 3=+4.5V

VCC:+5V

– 14 –

X2:

4.19MHz is inputted as the CPU main clock. 

X1:

32.768KHz is inputted as the time renewal clock. 

This circuit sounds buzzer with the BUS signal from the CPU.

The reset signal is formed with VOC and VDD. The /RESET signal is
also outputted when the mode switch is at SRV position. 

IC2

CPU

X1

32.768KHz

C14
33P

C16
22P

R51

330K

R93

1M

X2

4.19MHz

X2

X1

XT2

P04

IC2

CPU

BUZ

BZ

IC6A

KID65003P

BZ1

VCC

+

IC2

CPU

/RESET

VDD

VCC

D24

1SS133

C18

22U/16V

+

+

C19

10U/50V

Q16

C3198

R59

1K

MODE SWITCH

/RESET

C11

M104

R58

1K

– 15 –