Epson MX-70 Appendix, Control Circuit Board and Initialization

APPENDIX I

Appendix I

Control Circuit Board and Initialization

Control circuit board

With the MX-70. such functions as head carriage control, paper feed control. etc., are performed by the one-chip microprocessor 8049 located on the control circurt board. The microprocessor has a 2K-byte ROM and a 128-byte RAM. The print head and two stepper motors are driven by the 16 driver transistors. fig. 1 shows the control circuit diagram

Transistor

STROBE_

Fig. 1 Control Circuit Diagram

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