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Zebra GK420d - Blurry prints from the Zebra GK420d thermal printer

chaos 10224 15
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  • #1 16438060
    chaos

    Level 12  
    Hello

    For some time now, I have blurry labels on waybills.
    Until recently, I had this problem every few labels, now it started to get worse and most of the labels on this printer come out more or less like in the attached picture. (I have blurred my personal details in red, but on the left side
    I use a drive roll because it has already printed several thousand labels.

    Maybe memory, maybe you have some other ideas.

    Tomorrow I will bring a rubber regeneration agent to the company and I will temporarily regenerate this roll, but maybe in the meantime you can tell me if it is a roll or where to look for the reason for such a printout.

    Zebra GK420d - Blurry prints from the Zebra GK420d thermal printer
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  • #2 16450158
    peterguma
    Level 10  
    Probably the end of the head. Was cleaning before the new roll according to the manufacturer's instructions?
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  • #3 16450592
    chaos

    Level 12  
    The head has probably never been cleaned :) . The strange thing is that sometimes it prints well and sometimes it does the same prints as I have shown.
    I haven't regenerated this pinch roller yet. For now, I have replaced it with a different printer.
    If it is a print head, it is not worth replacing it. But it doesn't look like a head to me. When the head falls, either the printout is faint or it does not print at all and here, instead of straight lines, it makes bushes.
  • #4 16454603
    chaos

    Level 12  
    I cleaned the head, regenerated the rubber roller, and so far she has printed several dozen letters :) no problem. Worse, this problem did not appear on all printouts before, but it appeared sometimes. It was only after some time of such occasional failures that she started to print every single label.

    Maybe it's a cold February ...? Let her print, see what happens to her.

    PS. The fact that the label is light is the fault of the scanner I used to scan it with. Printout is well blackened normally. It's just about smearing the barcode and other text on the right side of the label.
  • #5 16457990
    peterguma
    Level 10  
    I got used equipment, so I have to enter the service mode and check the head wear. As for blurry codes, I also have a problem with that. Additionally, my printer did not print right in the center (blank strip). After many cleanings and adjustments (print speed and blackness) it started to print nicely.
    Regarding blurry codes, this is the result of the adhesive used on the sticker tape. The manufacturer claims that this is the fault of the lack of cleaning with a special marker pen after each roller change.
  • #6 16458576
    chaos

    Level 12  
    And, unfortunately, nothing helped. She started smearing the labels again :( .

    Is it normal for a printer with a damaged head to print a little bit perfectly and allow a printout in some time?
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  • #7 17415761
    Lasgo07
    Level 2  
    Hello :)

    I will step on the topic. My zebra printer has stopped printing normally and how do i fix it. The printer began to distort the printouts. Instead of the entire label, it prints in half and, in addition, everything is flattened. I already reset it and calibrated it and it didn't help. A friend had a new stepper motor which we replaced and it is still the same. I attach a photo and ask for help with the repair.


    Zebra GK420d - Blurry prints from the Zebra GK420d thermal printer
  • #8 17416221
    chaos

    Level 12  
    I read somewhere that this is a memory problem. I didn't fix mine. I replaced it with a new (used) one.
  • #9 17416563
    Lasgo07
    Level 2  
    The strangest thing is that the printer works and no error occurs. It only has a problem with calibration sometimes, it will calibrate once and not. The error does not light up. It also has a problem with the correct label setting. Sometimes it will set well and sometimes it will halfway. Print without changes. It prints a flat label on half of the page each time.
  • #10 19257779
    123babajaga
    Level 5  
    I will connect to the existing topic because it fits.
    Zebra ZDesigner LP 2844 printer.
    Most of the labels print correctly (paczkomaty / dpd / Pocztex), there is only a problem with printing one type of font in inpost courier labels.
    Can anyone tell if it's a problem of the printer itself or just the settings? And, if necessary, suggest what settings to change to improve the readability of what is marked in red.
    Attachments:
  • #11 19257894
    Lasgo07
    Level 2  
    In the printing preferences, set the print type to: diffuse. Then it should be ok.
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  • #12 19258108
    123babajaga
    Level 5  
    In the "scatter" tab, I have the "Scatter type", the following options are available: smooth (checked) / scanned / detail / none.
  • #13 19258225
    Lasgo07
    Level 2  
    Please try detailed. If it doesn't help, you won't do anything about it. These printers have poor resolution. It is similar for me with inpost courier labels. The rest is ok.
  • #14 19990666
    Sami500
    Level 8  
    Can anyone tell me how to enter the code in the ZPL file so that the printer prints a black background on the entire surface of the label? I want to check the quality and condition of the head.
  • #15 20167128
    Marcel1313
    Level 2  
    Hi,
    Check the roller under the head, blackness, but it may also be the fault of the clamp.
    What if there's a bad print on every label and you can see the cycle? It could be a roller.
  • #16 20465661
    WojtekRav
    Level 17  
    >>19990666

    ^XA
    ^FO10,10^GB500,500,500^FS
    ^XZ

    the above code prints a rectangle where FO10,10 position in pixels of the beginning of the rectangle, GB500,500,500 width and height and fill thickness

    If you adjust the above to the size of the label, you should print a blackened label.
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Topic summary

The discussion revolves around issues with blurry prints from the Zebra GK420d thermal printer. Users report inconsistent print quality, with some labels appearing clear while others are smudged or distorted. Potential causes identified include a dirty print head, worn rubber rollers, and issues with the adhesive on the label tape. Solutions suggested include cleaning the print head, regenerating the rubber roller, and adjusting printer settings such as print speed and darkness. Some users also mention problems with calibration and memory, indicating that these could contribute to the printing issues. A related discussion on the Zebra ZDesigner LP 2844 printer highlights similar problems with specific fonts and suggests adjusting print settings for better readability.
Summary generated by the language model.
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