A very thin light blue line appears on all printing jobs
The line runs the length of the paper, about 2 inches from the right side.
Opening the door reveals a thin line on the transfer belt. The line is most likely toner as it can be removed with very light wiping. When wiping it with a bit of white paper, the color is hard to discern, but seems to have some blue and maybe red in it.
When I wipe it all off both sides of the belt, the line on the printed paper and the belt recurs.
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The green light should be blinking it is an indicator of power to the terminal.
if you have a printing problem let's first check how you are loading the paper. if you scratch the paper with your fingernail you should get a faint black line. the side of the paper that has the line should be placed in the palm of your hand. (facing down) if you take your hand to the opening of the terminal. and let the paper roll off your fingers into the terminal the side with the line should be down and you should be able to grab the beginning of the paper and pull about 2 inches past the opening of the paper load tray. then close the lid. making sure the roller on the lid is lightly touching the paper. do not feed the paper through anything it sits in paper load tray. there should be 1 roller- black in color that is the length of the paper and it should have a sprog (spindle) type wheel that has grooves that will push or pull another sprog to move the paper.
if you don't have one sprog and roller on the door you need to get a replacement door.
if you do have those close the door and press the 2nd purple key to your right. this is a reprint button, see if something prints.
if it is still not printing. make sure the paper is the correct size.
It seems to me to be a problem of the Blue paper cassette size dial is set wrong. First see what the settings are from the display by pressing the paper select button. Most people have it set for the upper cassette to be LTR ( 8 1/2 X 11 inch paper - length running from front to rear in the cassette ) and the lower cassette to be LTR-R ( 8 1/2 X 11 inch ) or Legal ( paper length running left to right). Check to make sure the blue dial agrees with what's in the cassette. Try doing the testing by putting the paper on the glass first and closing the top. If this is correct and the problem is in the Documnet feeder then one of the raised flags may be broken or the sensor bad. The left one is for letter, the second one for LTR-R or legal and the third is for 11 X 17. The opening and closing fo the side guides also helps to determine paper size. Hope this helps you.
Fuser hot belt has wear lines transfering to the page
Black pcu needs to be replaced
Transfer unit is not being cleaned properly and needs to be replaced.
Remove each of these assy and inspect them for wear or lines that corespond to the lines on your prints.
This sounds as if you have some ink/contamination on the small scaning glass that sits to either the left or right of the main glass on the copier.(Depending on the model/make)As your original is scanned over this thin piece of glass the scanning device will see any spots and this will result in a black line down the page.Please clean the glass with a soft rag.