Epson LX-86TM Spezifikationen PDF herunterladen (Seite 67)

REV.-A

.—

FIRE

HD1

HD2

H~~

—

HD8

HD9

HD1

-8 (H) 41 22 14 08 14 22 41 00

00...

HD9

(H) 80 80 80 80 80 80 80 80

00 . . . . .

Fig. 2-34. The Relationship Between the Carriage and Printhead Control Signals

Figure 2-34 shows the relationship between the carriage and the

printhead when character “~” is

printed in the Draft mode. The dot data of HD 1 through

HD8 and HD9 synchronizes with the LOW level

The phase switching for the carriage motor is performed asynchronously with the application

of the drive voltage to the

printhead. A delay time (Dt) of 46 psec. in the Draft mode (900

PPS)

and

psec. in the

NLQ

mode (450

PPS)

is used in order to protect the +24 V line from being overloaded.

Printing for one line is performed in the sequence described above. In the

NLQ

mode, half of the dot

pattern is printed for one line, the paper is fed for 1/216 inch, and the remaining half of the dot pattern

is printed. In the half speed mode (valid when the printing speed is 900

PPS),

the printhead drive pulse

width is doubled (720

Ps)

and the carriage drive speed is halved (450

PPS).

2.4.8.2 Bidirectional Logic Seeking

The bidirectional logic seeking is controlled by the CPU. The CPU starts printing after expanding the

print data. However, the processing of the next group of data is started while printing the former group.

In this way, the CPU can determine the carriage return position for the next group of data so that the

carriage can be moved the shortest distance before printing the next line. Figure 2-35 shows this

operation.

2-35

1 2 ... 62 63 64 65 66 67 68 69 70 71 72 ... 141 142

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