Question about Epson LQ-590 Matrix Printer
As soon as the paper touches the sensor the rollers starts reverse feeding that is paper out insted of loading
Assuming that you are feeding the paper into the correct end of the printer :), it seems that the printer is defective, but
First unplug the printer from the wall, wait a few minutes,
and see if it resets. If that does not work, read on.
are controlled by "Stepping Motors"
Unlike an ordinary DC motor with two wires, that spins
clockwise or counter clockwise depending on the voltage
a stepping motor contains several pairs of wires, that
are pulsed in a controlled sequence, causing the motor
to spin in precise angular steps. Depending on the
number of wire pairs (poles) and internal gears, the
stepping motor can have a resolution as course as
90 degrees, and as fine as 0.05 degrees per step,
depending on the cost and applications.
Linear stepping motors can even move an object in
a straight line.
The benefit of these stepping motors is that, unlike a
linear servo motor, they do not need complex positional
feed-back for precise control, they simply step as many
times as you tell them to. Four steps left, two steps back
ultimately controlled by a central processor within the printer.
Depending on the printer model, and how sophisticated
the printer's internal processor is, the paper and head
movements can be either automatically controlled by
SOFTWARE (firmware) within the printer itself, or by the device drivers installed in Windows.
The more self-sufficient the printer is, of course, the less
hassle and CPU overhead on your PC.
a) Skip steps
b) Get stuck
c) Oscillate back and forth
d) Spin backwards.
a) One bad wire in the ribbon connecting the motor
to its controller board.
b) Bad motor driver transistor: Open or shorted.
c) Bad data line from the printer's internal control
processor to the driver transistor array.
d) Bad processor chip, memory or firmware within
the printer, e.g. a burned out register or firmware
e) Defective internal power supply, causing everything
else to malfunction.
f) Bad paper position sensor
d) Crashed control program, which is probably the
only thing that is fixable:
i) unplug the printer from the wall socket, wait a
few minutes, and see if it resets.
the Window drivers are corrupt but this is very unlikely.
Is one of the motor windings open or shorted ?
Is one of the driver transistors fried ?
This very much depends on your level of skill, and the test equipment you have to work with. If you don't have a decent oscilloscope you will not get far. Without a digital multimeter you will not get anywhere at all.
Call the manufacturer, scream blue murder, accuse them of setting your house on fire and giving your dog diarrhea ....
and see if they will send you a freebee.
Hope this explains it.
Please rate my answers.
Posted on Jul 18, 2008
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