Like DirtDoctor who stated:
"I am having a problem with banding on prints from i9900 even after much cleaning and alignment attempts. It seems to get worse further into printing. I have tried various maintenance to no avail. Is this a printer head issue?"
-- I am experienceing the same problem, PLUS:
Black ink smudges happening on prints.
Had great prints up until recently, when the bands started appearing.
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Re: "Banding" on Prints
Do a thorough manual cleaning of printerheads (where the cartridges sit). Many printers are notorious for clogged nozzles and the ink dries on he prinheads until it becomes a bandind issue or ladders appear, smudges too. Use a proper cleaning solution and cotton buds, until most colour is gone off cotton buds. Reinsert cartridges and try again.
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Head cleaning is for fixing horizontal band. If some point of head cloged, print out will show horizoantal banding. For vertical banding, try using head alignment. Have yo tried printing without high speed (disable high speed option)
Sounds like you've picked up some dried ink on the print head or ink holder. I would suggest removing all the ink cartridges and the ink holder (see directions from Canon) and clean the bottom with rubbing alcohol and a Q-Tip or cotton cloth. DON'T use paper towel, it leaves lint. Check the rollers also to make sure they don;t have ink residue on them. Be cautious when working inside your printer.
It sounds like you need a new purge assembly, that's the unit on the right where the printhead parks. It does the cleaning and also primes the printhead during printing, the ink can clog in the tubes and pumps and if you are printing photos, I would replace it before wasting any more photo paper.
Nozzle check must perfect for perfect output. There are tranversal lines at vertical straight lines that represent same point of head micro piezo. If tranversal lines no clog at all, but vertical straight lines not perfectly straight, the result not good (like horizontal white banding). Check it? Head aligment is for vertical banding. If your result is horizontal banding, you don't need to realign head. It's caused by some residual at the output of head sprayer. So, the spray of ink not straight to paper. Try to print with photo/best photo.
try printing all 7 color individually as a 1st step in diagnostic so you'll know w/c color is actually giving you the problem, no need to do the software this is a hardware problem, it could be one of the ink cartridges,