PRINCIPLES OF OPERATION
REV.-A
2.3.5.4 Paper-Feed Motor Software Control
A four-phase, 48-step open-loop controlled motor is used to drive paper feeding. A 2-2 phase excitation is
normally used for this printer, under which a one-step phase change drives the paper a distance of 1/180
inch. The 1-2 phase excitation is used only when it is necessary to achieve a drive distance of 1/360 inch.
Table 2-7 shows the paper-feed motor excitation system.
Table 2-7. Excitation Sequence
(Clockwise: Paper Feeds Forward, 2-2 Phase Excitation)
NOTE:
If the paper-feed motor is driven counterclockwise, paper is fed in reverse.
Figure 2-61 shows the paper-feed motor drive timing chart.
(For 2-2 phase excitation)
Figure 2-61. Paper-Feed Motor Drive Timing Chart
NOTE:
If there are fewer than 10 steps, the speed does not change.
2-54
LQ-510
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