HP Officejet Pro L7780 All-In-One InkJet Printer Logo
Posted on Jan 21, 2010

Paper Jam cleared but?

Had a paper and cleared, still getting jam message , sounds like it wants to pick up paper then paper jam message comes back-- this is a L7780 printer

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  • Posted on Jan 21, 2010
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It sounds like the paper sensor in the paper try is broken or jamed. Remove the paper tray and locate the paper sensor. Check if it is jamed in the up position or if it is broken.

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As soon as I started using recycled ink cartridges, I started getting a paper jam error on my printer. The control panel message instructs me to remove the back panel and clear paper jam. I've done this several times but there is no paper to clear and the message keeps coming back. I've tried turning of the printer and unplugging it to clear the memory, but that doesn't help. Could it be that the chip on the ink cartridge is messing with the printer's operating system?
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Try cleaning the roller that picks up the paper. You can use a drop of alcohol to clean the roller.
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In order for a jam message to reset to READY, the printer logic is looking for an "06 COVER OPEN" message. The top cover of the machine must be opened to clear the jam message. If the top cover interlock switch is stuck closed, the printer logic never clears the jam message, even after all the paper has been removed. The printer appears hung with the paper jam message and can only be made READY by powering the printer Off and back On.
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E-04 Clear Paper Jam, no paper in printer

  1. Turn off the printer.
  2. Remove any paper trays. Inspect them for wrinkled or damaged paper.
  3. Also open the back cover of the printer if this model has one.
  4. Open any other doors that give access to the printer's paper path and to the toner or ink cartridge.
  5. If necessary, remove the toner or ink cartridge. Place it away from light/ sun light to avoid damaging it.
  6. If you find a piece of jammed paper, remove it by holding it with both hands and pulling firmly. The goal is to keep the paper from tearing. If several pieces are jammed together, try pulling out the middle piece first to loosen the jam.
  7. If the paper does tear, try rotating the roller gears manually to free the paper. Don't force anything, though. Do this step especially if the jam message comes up repeatedly without any obvious paper jam, there may be a small tear of paper inside.
  8. Ones the printer is free of paper Replace the toner or ink cartridge and paper trays, close any doors you opened and turn the printer back on.
  9. If the printer paper jam message still appears, then there is still some paper in the printer. Reinspect the paper path.
  10. see alternative if the problem is still not solved.



alternative :
Load a piece of thick paper, for example photo paper and press the resume button (may be diffrent button on diffrent models) a few times to the printer picks up the paper and puts it through the machine.
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PAPER JAM

give this a shot
try this, its probably a small part of jammed paper or then theres a problem with the pickup, try cleaning it.

  1. Turn off the printer.
  2. Remove any paper trays. Inspect them for wrinkled or damaged paper.
  3. Also open the back cover of the printer if this model has one.
  4. Open any other doors that give access to the printer's paper path and to the toner or ink cartridge.
  5. If necessary, remove the toner or ink cartridge. Place it away from light/ sun light to avoid damaging it.
  6. If you find a piece of jammed paper, remove it by holding it with both hands and pulling firmly. The goal is to keep the paper from tearing. If several pieces are jammed together, try pulling out the middle piece first to loosen the jam.
  7. If the paper does tear, try rotating the roller gears manually to free the paper. Don't force anything, though. Do this step especially if the jam message comes up repeatedly without any obvious paper jam, there may be a small tear of paper inside.
  8. Ones the printer is free of paper Replace the toner or ink cartridge and paper trays, close any doors you opened and turn the printer back on.
  9. If the printer paper jam message still appears, then there is still some paper in the printer. Reinspect the paper path.
  10. see alternative if the problem is still not solved.



alternative :
Load a piece of thick paper, for example photo paper and press the resume button (may be diffrent button on diffrent models) a few times to the printer picks up the paper and puts it through the machine.

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Hi there,

Here is the most important thing to understand about paper jams in any printer....

The printer does not know if there is a paper jam anywhere in the printer.

What it does do, is respond to sensors ( optical sensors, either open or closed, by plastic flags). These flags are moved as paper moves through the paper path.

One example of a paper jam message when there is really no paper jam, is when the feed rollers are worn and do not pick up paper from the paper tray.

When you start printing, the printer expects that first sensor to open ( paper passes the sensor ) at a very specific point in time. If the paper did not get picked up from the tray, then the printer will ASSUME that the paper must be jammed somewhere because it did not reach it on time.

Now this will also happen if in fact the paper did get picked up and then jams prior to the sensor.

So... if you get the picture of how this works, understand then too, that if the printer is showing a paper jam message at power on, then one of the flags is open when it should be closed.

If you do not actually have a piece of paper holding this flag in the open position, then the flag is possible broken.

I usually see this kind of damage occur after a true paper jam, where the paper is removed either in the wrong direction ( pulled out back the way it was going instead of the way it should normally travel ), and this breaks the flag, or it was pulled out forcefully again, catching on and damaging the flag.

All of the above pertains to ANY printer, and not just yours. you must take care to fully inspect every inch of the paper path, from the paper tray, to the exit, use a flashlight, and look for the sensors and make sure they are not blocked or broken.

Good luck,

Cory
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Make sure it picks up paper - this is probably worn paper pick up wheels this is a repairable problem but you will have to contact HP about it. or go to www.fixyourownprinter.com
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