Epson LX-86TM Spezifikationen PDF herunterladen (Seite 64)

REV.-A

2.4.7

Printhead

This section gives an outline of the software that controls the printhead, the drive pulse width control,

and the drive circuit. The specifications of the

printhead are as follows:

Number of solenoids

: Nine

Drive voltage

: +24 VDC

Coil resistance

: 19.2 ohms

+10%

Printhead

drive pulse width: 360

&10

ps (at 24 V, 25°C)

2.4.7.1

Printhead Control

The data is output to the

printhead in the following sequence:

Print data is expanded in the image buffer as dot patterns. The CPU outputs the dot patterns to the

E05A03.

The data for pins 1 through 8 of the

printhead is latched by HD 1 through HD8 of the

E05A03.

(MMIO

XX04H write operation)

The data for pin 9 of the

printhead (usually for underlining) is latched by HD9 of the

E05A03

via

DB7.

After latching the data, the printhead drive pulse width signal FIRE is output from the event counter

in the CPU. While the FIRE signal is LOW, the gate opens so that the data at HD 1 through

HD9 is

output.

The timing of the event counter in the CPU is set mechanically. The data write operation is completed

within one cycle of the counter. The operation described below is inhibited to protect the

printhead

from being damaged.

FIRE

Normal

Dot Pattern

Half

Dot Pattern

time

Fig. 2-29. Printhead Drive Pulse

Pattern

Figure 2-29 shows the sequences for the normal and half dot printing, which can be performed at any

pin of the

printhead. Driving the printhead continuously to print adjacent half dots (the portion marked

● in the above figure) is inhibited. If this pattern exists after expanding the image data, one dot will be

ignored.

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