Epson LX-810 - Operating the Control Panel

REV.-A
2.2.4.4 Paper-Feed Motor Software Control
The paper feed motor is a 48-pole step motor and is open-loop controlled. When 2-2 phase excitation
is used to drive the motor, each step feeds the paper a distance of
1/2 16th inch.
Table 2-7 shows the paper-feed motor excitation system.
Table 2-7. Excitation Sequence (Clockwise: Paper Feeds Forward)
Step No.
Phase A Phase B Phase C
Phase D
o ON OFF ON OFF
1
ON OFF OFF ON
2
OFF
ON
OFF
ON
3
OFF
ON
ON
OFF
NOTE: If the paper-feed motor is driven counterclockwise, the
Figure 2-41 shows the paper-feed motor drive timing chart.
1
paper is fed in reverse.
I
1!1
A
ICI !
IC2 ! IC3 ! IC4 ! t !
Figure 2-41. Paper-Feed Motor Drive Timing Chart
NOTE: If there are less than 10 steps, the speed will not change.
2-38