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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 con-
trol 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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