On your printed format, check that the settings are for the style stock used.
Also recalibrate the printer. If you are using ribbon, make sure that you calibrate correctly for thermal transfer.
If all else fails, go in the setup and check the readings on the led and sensor to see if they are with in factory spec.
Depending on what stock you use, and what sensor(reflective or eyemark- or gap mode), make sure the sensor is aligned with it's pair.
Check to see if the back feed is turned on or not.
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See if it still happens using a fresh label roll. From the Dymo 450 User Guide the common causes of poor print quality issues.
Poor print quality is most frequently caused by one of the following:
• An old roll of labels
• Labels made by a manufacturer other than DYMO
• Labels where the thermal coating has been compromised
• A dirty print head
First, make sure you are using DYMO-branded labels. Do not use third-party labels because the thermal coating on other labels has a different sensitivity than DYMO-branded labels. Also, the perforated holes between the labels made by other manufacturers are frequently not detectable by LabelWriter printers.
If the print quality becomes faint, small dots of white appear scattered through the printed characters, or light and dark patches of printing appear, you are probably using a faulty roll of labels. Try using a different roll from a fresh box. If the second roll prints correctly, the problem is with the first roll of labels.
Another possibility is that the LabelWriter print head needs cleaning. Every LabelWriter printer comes with a cleaning card. See "Caring for Your Printer" on page 17 for information about the
LabelWriter cleaning card.
After many efforts I have found that in the new PX6i models, the "transfer ribbon mechanism" (the wheel that is responsible for making the ribbon roll) appears to be defective. What happens is that when rolling back in order to keep the ribbon stretched, instead of stopping at the fixed point, it continues to roll back a bit. After a few prints, this causes an "out of ribbon" error. The solution: replace this part with a VALID part (a new one). Good luck!
This problem is a detection problem, due to a bad sensor selection or incorrect label size.
If the labels are white labels with a separation between each, select TRANSMISSIVE. If the labels are preprinted, select the TRANSMISSIVE PREPRINTED LABELS and set the threshold doing this.
With the printer in ONLINE, press PAUSE once, the message PAUSE appears in the display, press and hold on the PAUSE key, TRANSMISSIVE is displayed, release the key and press PAUSE until labels starts to feed, let feed some labels (5 or 6) and release the key. Press Restart and start to print.
You get the error because the printer doesn't see any paper.
There are paper guides that need to be set for the size of the labels being printed. If you are switching from a 4" wide roll or sheet to a 3 1/2" label, you will have to move the slider in about 1/2". You will also have to calibrate the printer when you change label stock. If it won't calibrate, make sure the photoeye is hittint the break between labels. The photoeye is located where you insert the labels into the printhead path.