Epson LQ 1050 - B/W Dot-matrix Printer - Page 99

REV.-A
Drive Sequence
When driving the paper feed motor, the phase excitation sequence differs depending the paper feed
direction. The table below shows the phase excitation sequence.
Table 2-11. 2-2 phase Excitation
Drive sequence
Foward Feed
Reverse Feed
Step No.
Phase A
Phase B
Phase C
Phase D
Phase
A
Phase B
Phase C
Phase D
1
ON
ON
ON
ON
2 ON
ON ON
ON
3 ON
ON
ON ON
4
ON
ON
ON
ON
NOTE: If the paper feed motor is driven counterclockwise, paper is fed in reverse.
2.3.5.3 Paper Feed Motor Software Control
This section describes the paper feed motor software control.
Software Control System
The speed and rotational direction of the paper feed motor are controlled by the printer firmware. Line
spacing is also controlled by the firmware. The minimum line spacing value that the user can set is
1/2 16 inch. The printer supports the following three speed modes for paper feeding.
Table 2-12. Paper Feed Motor Speed
Speed Mode
Feed Speed
Excitation System
Description
1
660 pps 2-2 Phase
Continuous paper feed
2
720 Pp!ii 2-2 Phase
Cut sheet intermittent feed
3
780 PPS
2-2 Phase
Cut sheet continuous feed
The paper feed direction is operated by following operation shown in Table 2-13.
Table 2-13. Paper Feed Direction and Operation
Feed Direction
Description
. Control Panel Operation (FF or LF switch)
Forward
● Print Operation
● Paper Load Operation
● Micro Adjustment Operation
● Paper Back-out Operation
Reverse
● Paper Load Operation
● Micro Adjustment ODeration
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