Epson MX-82 Manuale Utente

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.

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.

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.

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