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I had this same problem and none of the printer services (clean printhead, align printer, calibrate linefeed) fixed the problem. After trying every solution that I found on the internet with no success I was able to fix the problem by cleaning two critical parts of the printer. 1. Turn off the printer and open it as though you are going to change the printheads. 2. Towards the back of the printer you will see a thin clear plastic ribbon that has very small black lines on it. Very, very, very gently clean this ribbon. I used a lint free cloth and some glass cleaner. Spray the cleaner on the cloth and slide the cloth against both sides of the ribbon. Do not pull on the ribbon. This ribbon is used to tell the printhead how far it has moved from side to side. 3. Next locate the silver bar that runs across the back of the printer. This bar is used to feed the paper through the printer as it is printing a document. On the left side of the bar you will see some plastic guides that hold the bar in place. On the outside of the plastic guides you should see a clear plastic disc made of the same material as the ribbon above.This disc also has very small black lines on it. Again very, very, very gently clean this plastic disc.This disk is used to tell the printheads how far it has travelled down the page.This is the one that was causing the problem.The dust or dried ink or whatever was on the disc was causing the printer to incorrectly calibrate the linefeed and was causing the white lines to appear on my documents. 4.Use the "calibrate linefeed" function of the printer services to recalibrate the linefeed and the white lines will hopefully be gone.
its a difficult situation....
if you are having good skills in servicing electronic equipment you may open the top cover sincerely and access to the mounting arrangement of the timing belt (transparent ribbon). It is easy to place it properly back on position.
Better to contact nearest HP service centre, if you are doubtful about your skills for the same....
Taken from /www.fixyourownprinter.com and definitely works. Don't touch the shiny hexagon part when doing this.
If you hear the squeal, then it is the laser/scanner motor in the laser/scanner assembly. It can sometimes be fixed but you have to be careful. You have to remove the top cover and the big black box in the center is the laser/scanner assembly. Sometimes you can access the motor by just removing all the cables from the laser/scanner and then removing the screws which hold the cover on the laser/scanner assembly and remove the cover. If you can not access it that way, then you have to remove the 4 additioal screws which secure the assembly to the frame. Now once you have access, the motor is the silver colored round item in the back of the assembly mounted on a small circut board. Remove the circut board and remove it from the laser/scanner assembly. If you look real close there is a small white plastic piece which holds the round motor piece in place. Use a needle nose pliers to remove that white plastic piece, but do not lose it. Now you can remove the round piece from the motor itself. Now here is where you have to be very careful. You will want to use 1 or 2 very small drops of light machine oil (tri-flo or similar) into the motor shaft. I would just use 1 drop and it should all disappear down the shaft. If you can see the top of the oil you put in to much. Now put the shaft and round piece back on, put the while locking plastic piece back on and reassemble and it may just work just fine. If not then the complete laser/scanner needs to be replaced.
The plastic cover you removed is very difficult to replace, but it can be done with a lot of patience. The deepest section of the cover faces the sensor and is toward the front. Try tucking the lip of the cover under the lip of the housing and then gently squeeze the cover piece from front to back and you fit it into the back edge. You'll know it's in there firmly when a little tapping on the cover doesn't dislodge it. Good luck!
make sure that the housing that holds the cartridges are clean at the contacts, this can be done with the machine turned off and unplugged, clean the contacts with warm water and a damp cotton bud not wet and then dry it with a paper towel.
make sure everything is dry before turning the printer back on, if this doesnt work then it needs a service.
It stretches from left to right behind the cartrige assembly and the assembly slides on it. It's a sensor strip for positioning the cart. asm. I'm not sure how it attaches, but you'd have to take the unit apart to do it.
Your printers alignment is out thats why it wont print ,
Take out the ribbon and look on the ribbon drive assembly for a white plastic screw ? press the outer ring (also white plastic) down it should be spring loaded.while this is down use a small screw driver and turn the screw counter clockwise and than release the spring loaded gear it will shot back up.Try this a few times till the printing gets better.