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CASIO PR-420A
Service Manual


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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of CASIO PR-420A Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

The manual is available in languages: English

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Text excerpt from page 14 (click to view)
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 �

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