Epson LQ 1050 Technical Manual - Page 105

Print Drive Pulse

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REV.-A Printhead Drive Pulse Width Control The width of the printhead drive pulse is controlled by the CPU (~PD78 10HG). The CPU monitors printhead drive voltage VP (+24 V) at ANO, kand controls the width of the printhead drive pulse (output from PC6 of the CPU) by making it longer or shorter according to changes in the drive voltage, so as to keep the drive voltage constant in order to stabilize print quality. (See Figure 2-50.) Figure 2-51 shows the relationship between printhead drive voltage and print drive pulse width. 350 Print Drive 3 4 0 Pulse Width 330 (M s) L I I I I 1 1 I I I I t I 1 1 1 i 1 I 1 I I I 1 r 21.6 1 I 1 I I I I I I I 1 I I 1 24 Drive Voltage (Vp) 320 310 300 i 1 1 26.4 V DC Figure 2-51. Print Drive Pulse Width 2-61

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REV.-A
Printhead
Drive Pulse Width Control
The width
of
the
printhead
drive pulse is controlled by the CPU
(~PD78
10HG). The CPU monitors
printhead
drive voltage VP
(+24
V) at ANO, kand controls the width of the
printhead
drive pulse (output
from PC6 of the CPU) by making it longer or shorter according to changes in the drive voltage, so as
to keep the drive voltage constant in order to stabilize print quality. (See Figure 2-50.) Figure 2-51 shows
the relationship between
printhead
drive voltage and print drive pulse width.
350
Print Drive
340
Pulse Width 330
(M
s)
I
I
I
I
1
1
I
I
I
I
t
1
I
I
1
1
1
I
1
I
i
I
I
1
I
I
I
1
I
I
1
I
I
i
I
I
1
L
1
1
1
r
21.6
24
Drive Voltage
Figure 2-51. Print Drive Pulse
320
310
300
26.4
V DC
(Vp)
Width
2-61