Question about Epson LX-300 Matrix Printer

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Unknown character prints when i give the print command

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Uninstall your printer driver.Again install it with correct driver.If your problem is not solver please check your printer cable.u may get right character now.

Posted on Jul 21, 2008

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Can you replace the printer ribbon on the Seiko DPU414 Printer?


ANSWER: Since it is a thermal printer it does not have a ribbon to replace.

Description:
The Seiko SII DPU 414 thermal Printer. For a compact desktop or portable thermal printer, the DPU-414 is an excellent selection. It incorporates the STP printer mechanism to ensure silent and high-quality printing of characters and high-density graphics. And in quadruple-density bit image mode, 640-dot (maximum) CRT display hardcopy is possible (with horizontal vs. vertical radio of 1:1).

Product Specifications
  • Model DPU-414-30B
  • Printing Method Thermal serial dot printing
  • Number of dots/line 9 x 320
  • Paper width (mm) 112
  • Printing width (mm) 89.6
  • Max Speed (character/sec) 52.5
  • Paper path Curved
  • Character matrix (H x W dots) 9 x 7
  • Character size(H x W mm) 2.5 x 1.9, 2.5 x 0.9 (Condensed)
  • Number of columns 40, 80(Condensed)
  • Character type Extend Graphics Character set, Alphanumeric, International Characters, Katakana Character set
  • Interface Parallel (36pins Amphenol), Serial (9pins D-SUB)
  • Input buffer 28Kbytes
  • Command ESC/P * conformity
  • Cutting Tear bar
  • Operating Temperature (°C) 0 to 40
  • Humidity (%RH) 30 to 80(Non condensing)
  • Service life (line) 500,000 **
  • Dimensions (W x D x H mm) 160.0 x 170.0 x 66.5 (printer unit only) ***
  • Mass (g) Approx.580(without Battery)
  • Compliance FCC, CE, VCCI
Manual:
http://sii-thermalprinters.com/pdf/manuals/DPU414/DPU-414_User_Guide.pdf

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Solution:
Go to start/priners and faxes and right click on your printer and select open. You will all the documents for print so far queued up. select and delete them. Restart your system and the printing should be Ok.

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Epson FX-2190 keeps on printing unknown characters


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How to change the density of the printer HP LaserJet 5p


I'm afraid this won't be of much help to the original poster, who asked the question a year ago, but anyway - others may be looking for this too, just like I did...

To change the print density, a simple command must be sent to the printer. This is done in two steps:
  1. Create a file, containing the command
  2. Send it to the printer ("copy" it to the printer, in a DOS shell)
The command is:
<ESC>%-12345X@PJL DEFAULT DENSITY=4
where <ESC> represents the "Escape" character (character code 27). There are several ways to generate the Escape character (which cannot be directly entered in a text editor): E.g. substitute the character with any other, save the command and then replace the first character with 0x1b using a hex editor.

Or:
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    copy con density.txt <Enter>
  • Hold the <Alt> key
  • type 27 on the numeric keypad
  • Release the <Alt> key - the Esc. char. is shown as ^[
  • Type the rest of the command (e.g. %-12345X@PJL DEFAULT DENSITY=4) - adjust the density value to the one you actually want to set.
  • press <Enter> <ctrl-Z> <Enter> to write the file
When you have successfully created the command file, send it to the printer. In the DOS window, enter:
copy density.txt LPT1
(assuming that your printer is connected to LPT1)

That's it!
To verify that the density has actually been set, print a printer status page.
The printer remembers this setting, so this needs to be done only once.

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