Dot Matrix Printer Head Test Software
Carol
Some businesses still use dot matrix printers to generate invoices, forms and other documents. Unlike modern laser printers, a dot matrix printer has a single print head and an inked ribbon. Neither the print head nor the ribbon last forever, and problems that develop usually indicate failure of one or the other. Issues such as the print head printing incomplete characters and documents with lines going through rows of text may point to a faulty print head.
Documents containing partial letters and other characters are one of the first signs of a faulty print head on a dot matrix printer. A printout might contain sentences that begin OK but then missing or partial characters appear. This typically means one or more pins on the print-head assembly are not firing against the printer's ribbon. It can also indicate that one or more pins have popped off the print head and are physically missing.
Printouts with excess ink or ink smudges, faded characters and overall poor print quality may be related to the ribbon as well as the print head. To troubleshoot this issue, replace the ribbon and print a test page to see if the output improves. If not, then it's likely that the print head is faulty; it will eventually fail if you continue using it.
Consult your printer's manual for details on how to remove and inspect the print head. The pins should be evenly aligned, and none of the pins should be bent or missing. If the print head is damaged, it must be replaced. If your printer contains a platen-gap adjustment lever that moves the print head closer to or away from the platen, you can try adjusting the lever and printing a few test pages to see if this resolves the issue.
If you have a spare print head, install it and run a test page. If the page prints OK and the output is sharp, the old print head is defective. Other components in a dot matrix printer can mimic the symptoms of a faulty print head, especially if you find no physical damage to the mechanism and you continue to experience poor print quality after installing a new print head. At this point, a trip to the repair shop may be your only option.
Blocked printheads: These can become blocked for a number of reasons, but the most common is that the ink cartridge and the printer head has dried out. This can be quite common if you don't use your printer often. We recommend covering your printer when it is not in use to keep it free from dirt and debris. This will help stop the printer heads from becoming clogged.
Inconsistent ink flow: If your inkjet printer has gone unused for a long period of time, the printheads may have become blocked or the ink in and around the printer cartridge may have dried out to cause inconsistent ink flow. Our colour test page will help you check the quality of your printer ink to ensure that the ink is flowing into your printer without issue.
Printer status: If your printer is printing test pages with no issues, but not printing any other documents, then you can confirm that the cause is a system communication issue rather than a mechanical printer issue.
This downloadable PDF colour test page will allow you to check the print quality of your printer. We recommend that you print this page on at least 80gsm paper in normal quality and at full size (100%). The PDF below is to be used for testing printers that use four or more colours. The test page shows a colour intensities graph, rainbow bars, radial gradients and a text block.
Alternatively, you can simply download and print our colour test page below, which will have everything you need. Or if printing in greyscale, check our downloadable greyscale printer test page below.
It is possible that the printer cartridge needs to be replaced. This can differ per printer. If this is not the case and the print quality is still bad, please send a scan or photo of your printed colour test page to our Customer Service team. They will then be able to assess the print quality and best advise you on how to fix the potential problem.
This downloadable PDF greyscale test page is best for testing the abilities of your black ink cartridge. As with the colour printer test page, it includes an intensities graph, radial gradients and a text block with descending sizes. This demonstrates current printer settings and scaling. Also shown is a grid, which helps the printhead align and ensures that the printhead is providing accurate printouts.
Our printing test pages should provide you with a robust and well-rounded printer analysis. A print quality problem can have several causes, if you look at our FAQs, you will find some possible causes and solutions. Alternatively, you can contact our Customer Service team.
The solenoids are contained in the print head, which moves across the paper printing one line of dots at a time. Originally, dot matrix printers used only nine pins in the print head. The 9-pin dot matrix printers were known as draft-quality printers and were later replaced by 17- and even 24-pin dot matrix printers. The quality of the 24-pin dot matrix was much better than that of the 9-pin because the greater number of dots creates a finer image.
- If the self test results are satisfactory, the printer is working properly and the problem is probably caused by your printer driver settings, application settings, computer, or interface cable. (Be sure to use a shielded interface cable.)
- If the self test does not print properly, there is a problem with the printer. See Problems and Solutions for possible causes and solutions to the problem.
Caution:For LX-300+II, you should use paper at least 210 mm (8.27 inches) wide to run the self test; otherwise, the print head prints directly on the platen.
For LX-1170II, you should use paper at least 376 mm (14.8 inches) wide to run the self test; otherwise, the print head prints directly on the platen.Follow these steps to perform a self test:
When using continuous paper, make sure paper is loaded, and the paper release lever is set to the correct position. Then turn off the printer.Caution:Whenever you turn off the printer, wait at least five seconds before turning it back on; otherwise you may damage the printer. To run the test, turn on the printer while holding down the LF/FF button or Load/Eject button.Self test is printed in Draft characters when the LF/FF button is held, or in NLQ characters when the Load/Eject button is held. When using single-sheet paper, load paper in the printer. After a few seconds, the printer loads the paper automatically and begins printing the self test. A series of characters is printed.Note:To temporarily stop the self test, press the Pause button. To resume the test, press the Pause button again. To end the self test, press the Pause button to stop printing. If paper remains in the printer, press the LF/FF button to eject the printed page. Then turn off the printer.Caution:Do not turn off the printer while it is printing the self test. Always press the Pause button to stop printing and the LF/FF button to eject the printed page before you turn off the printer.
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For the dot matrix printer you need to clean the internal parts of this unit and you must put a lubricant on the moving parts of this machine, normally on the shaft where the print-head assembly is attached.
Clogged printheads are the result of dried-up ink from lack of use, which can lead to patchy or erroneous printing. You can usually fix clogged printheads with your printer's built-in self-cleaning software, though you may have to clean the printheads manually if that doesn't work. Fortunately, cleaning your printheads is easy, and this wikiHow guide will teach you how.
An Epson dot matrix printer is an invaluable resource for a vast number of businesses because it makes accurate printing on pre-filled forms. Rather than relying on a reservoir of ink, dot matrix type printers use a print head that utilizes impact technology to ease the burden associated with imprinting long and custom forms with text.
One of the reasons that dot matrix printers are used in business environments is due to their low cost of operation and minimal maintenance requirements. Standard printer cartridges are prone to drying out during periods of inactivity, but the print head interface in a dot matrix printer is not as likely to degrade over time. Also, the heads responsible for transferring the ink from the print head to paper are designed to withstand continuous use.
The following example contents of the matrix context is from a job in a matrix that has the os and node matrix properties defined in the workflow. The job is executing the matrix combination of an ubuntu-latest OS and Node.js version 16.
I have several printouts from what is presumably a dot-matrix printer, dated 1987. When zoomed in on these, you see the usual stair-step patterns on diagonal lines. However, it's difficult to determine exactly where the individual pixels of the monochrome image lie... part of this is the tendency for the ink to bleed into cheap paper, littering the edges with splotches and so forth. This alone can't account for some of the problems I've had trying to restore an original raster of the image... the width and height of features don't appear to be multiples of some common factor.
Now, my understanding of the mechanism that a dot-matrix printer uses for printing is that there will be a single vertical row of pins, and then a stepper motor moves that array horizontally across the paper. Unless great care was taken in the engineering of the mechanism, there's no reason to expect that the distance between the pins vertically would equal the shortest distance the array can be moved horizontally. There's also no reason to expect that the horizontal movement would be a minimum of the width of a pin... overlaps might be possible (speculation on my part, I don't know if this was ever offered, or what the point would be).
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