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CBM-710/720 Service Manual
10
3. Printer Control Circuit
1) When L is output to the CPU port P31, the motor rotates and a timing pulse appears at the DP terminal of
CN5.
2) After rotation of the motor, printing starts in timing at which the port P34 is changed into L from H by the
home pulse of the printer.
3) In 9 ports of CPU output ports P20 to 27 and P30, the L pulse is output to the necessary port. Electricity is
applied once to the DOT solenoid for two timing pulses and characters are printed.
4) The paper is fed when the CPU port P33 becomes L in the specified timing.
5) Color is changed when the CPU port P32 becomes L in the specified timing.
Fig. 3-1. Printer Control Circuit
Operation Panel
Winder
CN6
PrinterPrinter