Epson LX-810 Technical Manual

REV.-A
Because the carriage is driven by a step motor, the printing direction can be changed at any time, and
the carriage can be stopped at any position. Carriage motor control is effected by an open-loop system
which switches the phases in accordance with the set speeds.
-f-e’’Jw-JL&aau
(phase switching
1
II
1 1 1
1 t
1 1 1
I
1
;~;
#
:4
Itc 1 “ tcz “
1
“tc28 ; t(constant) I ‘“1
I
or tc14 ;
+D28 ;
Holding
-l
A
I
w
or t014 #
Acceleration area “ Prlntln area “
(Accelerating)
!
Deceleration “
(constan speed)
area
(Deceierat ing)
Figure 2-35. Carriage Motor Control
Home-Position Seek
The control that causes the carriage to move to the home position when the power is turned on is called
home-position seek. Figure 2-36 shows the home-position seek operation.
When power is applied, the printer executes 2-2 phase excitation for 20 or 30 ms (regardless of the
phase switching timing) and checks the HOME signal. The result of this check determines whether the
starting position should be 1 or 2. The carriage enters the home position only once during the
initialization.
k
CR Movable Area
I
I Home
Printing Area
i
>
I
I
I
<
I
a
Ii
<
II
4step
I
P
1’
I
2steps=
I
End of Home Position seek
I
I
.—
– --t
-1
———. —— — —— — — ——— ——— ———— —
Constant
\
I
+ >
Constant
Deceieation
I
<
i’
Acceleration
Acceleration
Figure 2-36. Home-Position Seek
2-33

Epson LX-810 Specifications

General

Print Method	Impact dot matrix
Number of Pins	9
Character Sets	96 characters (USASCII)
Line Spacing	1/6 inch
Paper Path	Rear
Interface	Centronics parallel
Noise Level	55 dB (A)