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Epson LX300 Manual

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LX-3(XI Service Manual
Operating
Ptinciph3
2.1 PRINTER MECHANISM OPERATION
l%is
section describes the M-3G1O printer mechanism and explains how it works.
2.1.1 Printing Mechanism
The printer mechanism is composed of the
printhead,
ink ribbon, and ribbon mask. The
printhead
is a 9-pin head for impact dot printing. Each wire has own drive coil, which causes the wire to
move in and out of the
printhead
to print each dot. The four steps below describe how these
driving wires work.
1.
A drive signal transmitted from the control
arcuit
to the
printhead
drive arcuit is converted to
the proper
printhead
driving voltage, which energizes a corresponding coil. The energized coil
then causes the iron core to become magnetized.
2. The magnetic force draws the actuating plate toward the core, and the dot wire, which is
comected to the core, rushes toward the platen.
3. When the dot wire impacts the platen, pressing against the ribbon and paper, it prints a dot.
4. When the driving voltage stops energizing the coil, the magnetic force from the iron core
vanishes. The actuating plate returns to its original position (the position
betbre
coil was
energized) with spring action. The dot wire also returns to its original position.
This is the sequence used to print a single dot.
The mechanism is equipped with a built-in thermistor for head temperature detection.
The
temperature detected by the thermistor is converted to an electric signal and fed back to the control
circuit.
Wire Resettin S rin
r
Stopper
Dot Wire
T’Y____
\Actuating Spring
Figure 2-1. Printhead Operation Principles
Rev.A
2-1
… 31 …


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