Why does E260dn have dark ink stripes on edges of paper?

Please check if the paper guides on the paper tray are correctly positioned. For example, if you are using a letter sized paper, make sure the guides are set to 8"x11".

Check the feed tray rollers. You might even clean them with an acohol pep pad out of a first aid kit.

I need to know where the paper gets stuck and does it concertina ( fold up ).
Where is the leading edge of the paper when the paper stops feeding?

Print an empty word document, and if it still shows the dark lines on the edges the rollers are most likely caked with ink, and they will need to be cleaned.

CLEAN THE NOZZLE AND PUT IT TRY TO USE NEW CATRIDGE

It sounds like the black drum unit needs to be replaced.

Appropriate cleaning procedures, as listed in the following tables, should be
performed when specific print-quality or paper transport problems occur.
All cleaning procedures are detailed in the printer’s Phaser 8400 Reference Guide or
the Phaser 8500/8550 User’s Guide.
Light Stripes or Missing Colors
Problem type Solution
Missing or light-colored
stripes on prints.
Select the automated procedure Eliminate Light Stripes from
the Control Panel.
Ink Smears, Oil Spots, or Random Ink Streaks
Problem type Solution
Ink smears on the front,
back, or edges of a page.
Select the automated procedure Remove Print Smears from
the Control Panel.
Check the maintenance kit for ink and paper-dust build-up on
the wiper blade.
Oil (drum fluid) on top edge
of print.
Select the automated procedure Remove Print Smears from
the Control Panel.

Hope this helps
pdouglasss

There is a small strip of glass on the left side directly under the edge of the scanner, About a half an inch wide. It has something on it.
May be very hard to see, use a strong glass cleaner or some alcohol and a regular piece of paper to clean it with.

I experienced the same approx. 1/2" vertical stripe on a Viewsonic vx1945 and ATI Radeon x1050 video adapter on Vista Business SP1, but the stripe appeared along the left edge of the screen, instead of right edge. I then temporarily decreased the monitor resolution, and the stripe went away. I then increased the monitor resolution back to its original setting, and the stripe did not re-appear. So, that was the 'fix' in my situation, hope this helps.

Try new injet cartidges. If your printer has separate head and ink combo, replace the jets. The high quality mode operates the piezo jets at full power and lower setting can cause jets not to open as far. On some preinters, your particalar problem can be the result of too thin paper and the economy setting being used. Use 18lb or 20lb paper and see if it still does it on normal print mode.