CASIO PR-420A
Instrukcja Serwisowa

7-3. Printer Pin Arrangement Diagram
Connection RD terminal Pin No. 1 Pin No. 15 Connection Character selective magnet column No.1 13

(Not used)

2

16

Character selective 3 magnet column No.1 2 4

17

14

18

15

3 4

5 6

19 20

16 17

5 6

7 8

21 22

Ribbon shift magnet Electromagnet (+)

Notes: 1. Column numbers match the physical arrangement of the columns on the print wheels. 2. Column numbers are assigned from 1 to 18 from the frame motor side. 3. Pin numbers are assigned from 1 to 27 from the frame motor side. 4. The spark arrestor diode is connected as shown below.

7

9

M

23

Motor power supply (+) Detector power supply (+) Timing signal Detector power supply (�)

8

10

24

Electromagnet (+)

Driver

9

11

25 26

10

12

(Example of compatible diode: 1S2075K or equivalent)

11

13

27

Motor power supply (�)

12

14

Motor power ON/OFF
*1

0.2ms max.

Timing signal
*2 8.0ms min.

T0

T1

T2

T3

T4

T5

T6

T7

T8

T9

T10 T11 T12

TS

T(0)

0.7ms max. 8 0.7ms max. 0.7ms max.

0.7ms max.

80.0ms min.

2.0ms min.

Character selective magnet No.n Ribbon shift magnet

(Print operation) (Normal paper feeding operation)
Typ. 285.7ms

Notes: 1. The signals in must be prepared by the user. 2. The pulse is indicated by a dot-dash line (*1) is generated for continuous printing. The next print cycle can start immediately after the leading edge of the timing signal Ts. 3. As shown by a dashed line (*2), the timing signal may go low at motor power-on or upon reception of a Print command. � 11 �