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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You could try to turn off printer.
Unplug printer from electrical outlet.
Wait at least 15 minutes, this will let the printer to clear memory.
Plug back in printer and turn on. Do a cleaning cycle.
The cleaning cycle will insured a good alignment page.
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.
Over on the right is not waste ink pads, waste ink is under the print engine covering the whole bottom of the printer. On the right is the purge assembly and there is ink on the filters on top and on the squeegee that wipes the printhead. You may need a new purge assembly, or just re attach a hose in the purge unit that may have come off. That printer is well worth the repair...
Try using some rubbing alcohol on a Q-tip on the rubber rollers and see if there is any fine dust or crud on them. They could be dirty and one side has better traction than the other. Otherwise I'd have to say it IS an alignment problem. A screw may have come loose. Hopefully it wasn't dropped or slammed. Good luck.