I get a black streak that is 1/8 to 1/4 inch wide on the back side of the sheet that I am printing, in the same place each time it happens. Is this caused by the print head and why is it on the back side of the paper?
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Re: wide black streak on back of printed paper
it is not directly coming from the head. Probably you are printing your photos without borders. This means that the printer prints slightly beyond he paper. As a consequence is sprays ink on the mechanics and after a while it starts to smear on the back of the paper.
This phenomenon is even mentioned in the printer manual (kind of caution when selecting borderless printing).
There is a menu item in the printer utilities that lets you clean the printer mechanics with a folded paper. I tried this, but it helps only little.
I have the same effect on a pixma IP 4500 , and I live with it.
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The is blocked by dust on the side of the paper on the image unit that would have color associated with the print. Remove all the image units and clean all the laser glass. Replace those image units also if streaking as for the paper ensure correct paper side and media type.
This is more than likely down to the upper roller in the fuser assembly. It's the heat roller at the back of the printer. The upper roller wears so paper dust and toner stick to the roller which then can get deposited back on to the page.
You need a new ink absorber kit with a guard sheet to stop ink from coming up from the bottom and getting on the exit rollers. It's a major job to remove the print engine and a messy one. Best done in repair shop..
You have a build up of ink inside the printer. I had a Canon that did this. I had to take the ink & print head out, and tear a paper towel strip 1 " wide and 13" long or however long the paper towel is. I folded it in half down the length so it was 1/2x13. Then used a plastic strip to shove it under the part the print head sits in. Once I got the towel to the other side, I grabbed it with my hand. I removed the plastic strip used to shove the paper towel under. So now the paper towel sticks out both sides underneath the print head cradle. I gently pull the paper towel back and forth so the paper towel can clean off the ink build up. Hope this helps.
Perform Print Head Alignment
perform a Print Head Alignment directly from the machine. If diagrams
or ruled lines are misaligned, print head alignment is required. The
print head alignment can be performed automatically or manually. If the automatic print head alignment does not work, adjust the print head manually.
Automatic Print Head Alignment
Press <ON/OFF> to turn on the machine.
Load a few sheets of letter-sized plain paper in the auto sheet feeder.
the Open button to open the Paper Output Tray. Then open up and set the
extension by pressing down the hollow on the front side.
Execute automatic print head alignment.
Press <COPY> button.
Press <Menu> repeatedly to select [MAINTENACE].
the left or right cursor to select [AUTO HEAD ALIGN], then press the
<OK>. (A pattern is printed and the print head is automatically
aligned. It takes about five minutes to finish printing the pattern.)