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When you banding vertical do you mean Across paper feed direction OR With paper feed direction?
If its across the feed direction the chances are thje issue remains with the individual printhead, Print out a quality maintenance print to find which Printhead is not working as well as wanted, then replace ( or clean using the plotters control panel under image maintenance.
Errors along the feed direction can be down to Software/ Main Pca /
If the print is a dismal gray rather than a sharp black, you are
probably almost out of toner. This can manifest itself evenly across the
entire page or in splotches or stripes, depending on the printer. Sometimes you can wring a little bit more out of a toner cartridge by
taking it out and gently shaking it from side to side (never up and down,
as toner can spill out). You can also try turning up the printer’s
contrast adjustment, if it has such a knob (usually on the back side if it
exists). Faded print can also result from a dirty corona wire, because a
dirty wire inhibits a full electrical charge from being passed. If the printouts are consistently varied in density, and you have to
frequently remove the toner cartridge and shake it to redistribute the
toner inside it, make sure the printer is sitting on an even, flat
surface. Horizontal black lines A horizontal black line on the printout is probably the result of a
dirty or damaged roller. There are lots of rollers in the printer, and you
can use the space between the lines on the page to determine which roller
is causing the problem. Measure the distance between the errant black
lines on the page and then use Table A to determine which part
might be causing the problem.
between lines Faulty
cartridge developer roller
cartridge photo drum Regularly spaced splotches If there are evenly spaced black spots but they don’t extend all the
way across the page, the problem is probably a scratch or flaw in the drum
or a build-up of toner on the fusing roller. If the spots are less than
three inches apart vertically, it’s probably the drum, because the drum
has a larger diameter than the fusing roller. Vertical black line on edge of page This can indicate an almost empty or faulty toner cartridge or (less
frequently) some spilled toner inside the printer.
Take it back, and get one that does work correctly.
> VERTICAL lines ACROSS the whole photo
Hold the paper in "portrait" mode, not "landscape" mode.
Are the lines HORIZONTALLY-ACROSS the paper,
or VERTICALLY-DOWN the paper?
If those lines are WHITE and HORIZONTAL,
then some of the many ink-jets inside the print-head are *CLOGGED*.
Run a "print-head-cleaning-cycle" to try to unclog it.
Or, exercise the WARRANTY, and get it replaced.
Unfortunately, as with the Z1420, fast print speeds come at the cost of print quality with the Z1300. Black text prints, though nicely dark, were beset by obvious jaggedness. The color graphics print had a slightly faded look to it and color blocks showed graininess and faint horizontal striations. Barcode-style patterns were muddled, too. For our tests, we printed color 4x6 photos with the standard black and tricolor cartridges, as Lexmark did not include photo ink tanks with the test unit. The colors were dull, details were hazy, and again, the entire print was marred by graininess and faint horizontal lines. That said, nobody buys a $25 printer to print photos for framing or to create displays for a classroom science project. A $25 printer is a convenience item for occasional reference prints, and as such, the Z1300 does its job.
the glossy paper you are using (hp) is smearing the ink... there is now ink on the feed rollers and you need to get in there and clean it all up with alcohol...also run epson matt paper for a few prints to get the color to lay down ..good luck
If you are running your copies through the document feeder then see if the line goes away if you make a copy directly from the glass. If the line goes away then open up the doc feeder assy. by hinging it to the left. Underneath you will find that there is a thin strip of glass that the document passes over when it is scanned. Clean this strip of glass and this should correct your problem. If there is a smudge of dirt or small line, it will come out as a solid verticle line when scanned.