Genicom MatrixPrinter LA36 - Manual (Page 120)

5-33
5.3.6 Paper feed control
The 4-phase paper feed motor is driven by four signals:
LFM0: This signal drives phase A of the paper feed motor.
LFM1: This signal drives phase B of the paper feed motor.
LFM2: This signal drives phase C of the paper feed motor.
LFM3: This signal drives phase D of the paper feed motor.
LFI1, 2: These signal switch the paper-feed motor phase current. Four current levels can be selected for
high speed, and stop.
Phase switching is controlled by the timer in the MPU used to determine the phase drive period. Figure 5.32
shows the relationship between phase switching and the drive direction.
A
D
AB
B
BC C CD
DA
Figure 5.32 Phase switching and paper feed direction