Table - Epson LQ-2550 Technical Manual

REV.-A
2.3.5.3 Relationship Between Paper Thickness and Print Mode
The sub
CPU detects paper thickness t
of three printhead drive pulses so that the correct print energy will be applied to the printhead
Table 2-49 shows the relationship between the printhead drive pulse and paper thickness.
As shown in Figure 2-73, the printhead coil is driven by the chopper type control which divides a cycle
into three pulses. The width of the first pulse is varied depending on the paper thickness so that the
correct print energy can by applied to the printhead coil. Table 2-50 shows the relationship between
the printhead coil drive cycle, printhead first drive pulse width, and print mode.
Table 2-50. Printhead Coil Drive Cycle, Printhead First Drive Pulse Width, and Print Mode
CR Motor
Speed Coil Drive
Cycle "1
[KHz]
4 0 0 0 2.00
2.00
2 6 6 7
2 0 0 0 2.00
1333
2.00
667
1.00
*1: The +35
line voltage is 35
V
*2: Refer to Figure 2-73 for the PNPON signal.
[mm] using the PT sensor. Based on t, the sub CPU selects one
Table 2-49. Printhead Drive Pulse and Paper Thickness
Normal mode
Copy mode 1
Copy mode 2
Width 2
copy
Mode Mode 1
110 120
110
110 120
110 120
110
1 2 0
V .
Paper Thickness [mm]
0.06 s t s 0.18
0.18 s t s 0.36
0.36 s t s 0.46
copy
Mode 2 Text
140
Draft
—
140
Half speed
140
Draft
140
LQ
Half speed
140
2-78
Printing Mode
Bit image
8-dot normal-density, high
speed double density
24-dot normal density
8-dot CRT graphics II
24-dot CRT graphics II
8-dot double-density,
quadruple-density
24-dot double-density
24-dot triple-density
—
24-dot quadruple-density
.- . . , ,
"
coils.
.
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