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Re: HP J5780 all in one printer
Your problem is one of two things. the first is that the paper settings for your machine is not set to plain paper. the unit will adjust the gap size to suit the media coming through the unit. check that your paper is set to plain a4 or plain letter, dependant on your location around the world.
the other issue is simple wear and tear on the unit. the seperation pad and feed rollers in your document feed assembly may be dirty or worn out. you can clean the rollers with some alcohol, however this does not fix your problem, that the chioce is replacement of the unit as HP do not supply spare parts for their inkjet range of printers.
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I could't understand the question exactly..I will try my level best, it may helps you..
T770 plotter having three media paths..
1. Sheet path
2. Roll 1
3. Roll 2..
After initializing, printer will ask to load the media, you have to specify the desired media selection ie sheet, Roll1, Roll2..
If U R selected roll one, message appears on screen "Open Roll 1 cover", you have to follow the message, once the paper is loaded in the path, printer has to detect the paper,it has to pull inside with the help of the roll feed motor.. In this case If UR selected Roll 1 on printer screen & inserted Roll 2 media, printer will runs Roll 1 motor, not roll 2 motor.. This problem U might be facing..
If my suggestion is not helping U, pl let me know exact problem what UR facing...
this is the rare case: there could be two problem
1) either some bit of paper would have been stucked inside the printer
2) or else the roller is not smooth. the roller inside the printer helps to draw out the paper gently.
most likely you have a flat spot on the roller.
that is exactly what is going to happen, when the paper hits the flat spot or a low spot. the paper stops and skips. them the print is coming out smeared.
you can get a repair kit or replacement roller from HP.
I don't know if you are running in sheet or roll media, but we have this problem with roll media if it is not aligned properly. Usually if I release the media lever and pull 10-12" of paper through and align it with itself and with the dotted line to the right of the plotter, then it will accept it. Sometimes takes several tries. Sheet problems may be caused by dirty sensors. Good luck.
This has occured to a 2.hand printer I just bought. First head was clogged very much. I disassembled the head, used a paper towel soaked in luke warm water to clear off the over-gooed printing head surface. It is quite easy to get the head out and back in. Unfortunately my cyan ran out during clean-cycle, so I can't say if it also cured the passing paper problem.