Epson MX-82 F/T User Manual - Page 88

APPENDIX 1-CONSTRUCTION OF MX-82 AND MX-82 F/T, Printer mechanism, Control circuit board

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APPENDIX 1 Construction of MX-82 and MX-82 F/T The EPSON MX-82 and MX-82 F/T dot matrix printers consist of the following three major functional blocks. (1) Printer Mechanism (2) Control Circuit Board (3) Power Circuit These three blocks are housed in a plastic case and are connected to one another. 1.1 Printer mechanism The printer mechanism has been developed by EPSON Shinshu Seiki Co., LTD., with the latest technology in the precision and electronic industry fields. The printer mechanism contains two stepper motors. One is to move the print head to the next print column position, and the other is to advance the paper. (1) Stepper motor for head carriage The stepper motor for head carriage is controlled under LSI "8041" called "slave CPU". The CPU knows the current printing position at any given time, and the print head is stopped at the last printing position. Then, the CPU seeks the shortest travel way to the next print line. This feature and bidirectional printing enable the Printer to perform the logical seeking function which minimizes the head travel time to the next print line. (2) Stepper motor for paper feed Paper is fed by the stepper motor, like the head carriage. One complete rotation of the stepper motor corresponds to 1/3 inch paper advance. In the MX-82, MX-82 F/T printers the operator can select any paper feed length under software control. (3) Print head The print head has 9 dot wires to form 9 x 9 dot matrix characters. 9 wires form more legible characters than those formed by 7 wires. The print head for the printer mechanism is quite compact. 1.2 Control circuit board In this paragraph, the printer LSI circuitry is outlined. The control circuit diagram is shown in Fig. A1 -1, and the driver circuit diagram in Fig. A1 -2. -83-

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APPENDIX 1
Construction of MX-82 and MX-82 F/T
The EPSON MX-82 and MX-82 F/T dot matrix printers consist of the following three
major functional blocks.
(1) Printer Mechanism
(2) Control Circuit Board
(3) Power Circuit
These three blocks are housed in a plastic case and are connected to one another.
1.1 Printer mechanism
The printer mechanism has been developed by EPSON Shinshu Seiki Co., LTD., with
the latest technology in the precision and electronic industry fields.
The printer mechanism contains two stepper motors. One is to move the print head
to the next print column position, and the other is to advance the paper.
(1) Stepper motor for head carriage
The stepper motor for head carriage is controlled under LSI “8041” called “slave
CPU”. The CPU knows the current printing position at any given time, and the
print head is stopped at the last printing position. Then, the CPU seeks the shor-
test travel way to the next print line.
This feature and bidirectional printing enable the Printer to perform the logical
seeking function which minimizes the head travel time to the next print line.
(2) Stepper motor for paper feed
Paper is fed by the stepper motor, like the head carriage. One complete rotation
of the stepper motor corresponds to 1/3 inch paper advance. In the MX-82,
MX-82 F/T printers the operator can select any paper feed length under soft-
ware control.
(3) Print head
The print head has 9 dot wires to form 9 x 9 dot matrix characters.
9 wires form more legible characters than those formed by 7 wires. The print
head for the printer mechanism is quite compact.
1.2 Control circuit board
In this paragraph, the printer LSI circuitry is outlined. The control circuit diagram is
shown in Fig. A1 -1, and the driver circuit diagram in Fig. A1 -2.
-83-