Genicom MatrixPrinter LA36 - Manual (Page 122)

5-35
5.3.7 Ribbon shift control
The 4-phase ribbon shift motor is driven by four signals:
CLM0: This signal drives phase A of the ribbon shift motor.
CLM1: This signal drives phase B of the ribbon shift motor.
CLM2: This signal drives phase C of the ribbon shift motor.
CLM3: This signal drives phase D of the ribbon shift motor.
Phase switching is controlled by the timer in the MPU used to determine the phase drive period (Figure 5.35).
AB
BC CD
DA
Figure 5.35 Phase switching and ribbon shift direction