Service manual

Principles of Operation
Paper feed motor software control
The paper feed motor is a 48-pole stepper motor. An open loop system controls the
paper feed motor under 2-2 phase excitation. The motor feeds paper 1/180th of an
inch for each step.
Table 2-8 shows the paper feed motor excitation system when
the motor is driven clockwise for forward paper feeding.
Table 2-8.
Excitation Sequence (Clockwise for Forward Paper Feeding)
Note:
If the paper feed motor is driven counterclockwise, it feeds paper backward.
Figure 2-44 shows the timing chart for acceleration and deceleration control.
2-46
figure 2-44. Paper Feed Motor Drive Timing Chart
LQ-200/AP3000