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1. The printhead in your printer might be scratched (evidenced by thin white streaks through your print). This is common, and the most likely cause. Printhead must be replaced. 2. Material might be stuck on your printhead (usually evidenced by wide white streak vertically through print). Printing surface of printhead can be cleaned with rubbing alcohol and cotton ball. 3. The ribbon might be wrinkling due to uneven tension, producing intermittent diagonal streaks in your print. This is somewhat common, but doesn't fit your description as well as 1 & 2 above. Mechanical adjustment and/or proper media loading solves ribbon wrinkles. 4. Poor pressure and/or printhead alignment. Evidenced by grainy, light or no print on one side or the other of the media. This is somewhat common, but doesn't fit your description as well as 1 & 2 above. Mechanical adjustment solves printhead pressure and alignment issues.
Bartender is a pretty good label software package - strange that you're having problems with a barcode. Are you by any chance trying to print a 2D barcode such as Datamatrix ? If that's true, then the problem is that the datamatrix barcode is not a resident barcode in the firmware version of that printer which is an older model. There should be a choice in bartender, in the properties of the barcode field that allows you to send the barcode as an image or graphic. The barcode will then print.
If you're trying to print a linear barcode (C39 or C128 or UPC for example) and it they won't print with the steps you have taken, then something is definetly wrong. Another option would be to take your label format and print-to-file instead of print-to-printer. There should be an option on the print screen for this. By then opening the file, the ZPL (Zebra's programming language) can then be examined to see exactly what is being sent to the printer.
Sounds like there are some elements worn off of the printhead causing some of the bars to not be printed. To test, create a label that prints a thick black line or solid black box across the width of the label (assuming a 4" label). Any vertical white lines that show indicate elements that are not functioning.
You could also put one label above the other, lining up the barcodes and you'll probably see bars that are missing from the label that won's scan.
The only ways to correct the problem are to install a new printhead or move the barcode field on the label so that the missing elements fall in the spaces between the bars.
Generally the ZM 400 can cope with printing at the lower speeds when printing barcoedes that are the same. You may get pauses if the barcodes are sequential numbers or are all different, then the data to be transfered to the printer cannot cannot keep up with the printer and pauses while it gets more data. We have found that if you can select in your labelling software to print the barcode as a graphic, then it speed up quite a lot. It is a matter of matching your print speed and quality to match your expectations, sometimes you will just have to put up with the pauses.
I'm 75% sure it will, without looking at the postal intelligent mail barcode printing specifications... I will be glad to answer your question, if you can get me the Specs. for the new postal intelligent mail barcode... the other important question is... what is you current IBM 6400-XXX printer configuration? press the print config, then the Start on your printer. 1st Paragraph is all you will need to give me... Worst case, you might need a differenent Emulation program...
This is defendant on the program you use to print labels with. The printer responds to either a print job sent to the driver (like a standard windows printer). Or you can send an EPL program to the printer in order to use internal barcode generating features of the printer. The dimensions of the barcode are controlled via the EPL script. See the EPL programming guide avaialble on Zebra's website for more info.