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APPENDIX 1
Construction of MX-80 Type II
and MX-80 F/T Type II
The EPSON MX-80 Type I I and MX-80 F/T Type II dot matrix printers (hereinafter
referred to as “Type II Printer”) 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
Type II Printer, 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. Al-l, and the driver circuit diagram in Fig. Al-2.
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