Question about Dell A940 All-In-One InkJet Printer

1 Answer

Printer carriage keeps moving.

Printer carriage moves back and forth when my computer boots up. What is causing this.

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  • nclore1 Sep 12, 2008

    I understand it moving when I first start up my computer, but it doesn't stop. It moves quickly 2 times, pauses, moves quickly 2 times, pauses, over and over again. This can't be normal because it didn't used to do this. I appreciate you suggestion, but do you have any other thoughts on this problem.

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  • Contributor
  • 5 Answers

This isn't a problem. When your the computer boots it is sending out a signal on the USB cable to make sure everything is ok. It doesn't know if more devices were added or removed after you shut it down and it's just trying to get its bearings about its environment. When the printer sees this signal it will do a sanity check of itself as well. It will move the cartridge carrier and it probably has a mechanism that wipes the printer head to make sure it is clean.

Don't worry...nothing is wrong here. :)

Posted on Sep 11, 2008

  • Damon Beaven
    Damon Beaven Sep 13, 2008

    Hmmm...that's interesting. I don't think I've ever seen that happen. Something you could try is to install the printer on a different computer to see if it does the same thing. Of course that is really difficult if you don't have another computer that you can easily try.

    Basically, if you can try that it will tell you if the problem is the printer or the computer. If it still happens, it is probably the printer. If it doesn't happen, then it might be the original computer.

    You could also try some other things if you haven't already. Swap out the USB cable that you are using...even connect it to a different USB port on the computer.

    Right now those are my best guesses at things to try to help figure out where the issue is.


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Hp 7520 carriage slams back & forth


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I have a HP psc 2175v printer and it says i have a carriage jam. There is no paper in the printer all at this point and the ink carriage moves back and forth fine, the ink was removed adn replaced but...


The cartridges might not be moving back to there rest stop correctly, check the sponge to the far right Also The clear plastic strip running behind the carriage could be damaged or dirty. this strip tells the printer where the carriage is and if it can not read it, it will cause that message.
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I don't know what type of printer you have, but you might try cleaning the thin plastic strip you'll see at the carriage. It has fine lines on it and it tells the printer where the carriage is. If ink or dirt get on it, you will get carriage jams. Try this: get a soft cloth moistened with water and gently (!) rub it on the strip back and forth, moving the ink carriage to clean the entire strip. Don't use anything other than water as the ink is water soluble. Also clean the rod that the carriage moves on with alcohol. Sometimes dust and other debris gets on it and causes it to move jerkily.

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What is a carriage jam


here are some solutions for your carriage jam error.

1. Clear any jam...remove loose paper.
2.Clear the jam from the back of the printer
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turn off the printer...remove the rear access door..
pull the paper out of the roller and return the rear access door.
3. Clear the paper jam from the front of the printer..while printer is on..open the carriage access door..
clip_image002.gif
disconnect the power cable from the back.. remove the paper output tray.
clip_image003.jpg
look inside the product..check for torn papers..gently pull out the paper fromthe roller...return the paper output tray and the carriage access door. plugthe power corn and turn on..
4. Make sure the carriages move freely...while the printer is on.. open the carriageaccess door.
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disconnect the power cord from the back..remove the paper output tray...lookinside if the carriage is stuck and if there is no papers or object that restrictthe carriage to move..return the output tray.. return the carriage accessdoor...
And lastly after doing this steps try to reset the printer and try to print..

To reset the printer....press the power button to turn on theprinter..disconnect the power cord from the product..disconnect the power cordfrom the wall outlet.. wait for 15 seconds.. plug the power cord to the wallsocket....plug the power cord at the back of the printer.. press the power onof the printer.. try to print the test page...

http://www.fixya.com/support/t6088190-hp_7400_displayshttp://www.fixya.com/support/t6088190-hp_7400_displays
Good luck! hope this solve the problem

Much appreciated if you rate this help.. thanks

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Turn on printer, imediately unplug power when carriage moving. Unplug usb. Move carriage by hand to replacement position.

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Look for a plastic strip where the ink station moves back and forth. It has tiny vertical lines on it which count as the carriage moves. If the strip gets dirty, the carriage may lose count and slam against the far stop. Power off the printer and gently clean the strip with a damp rag. Rub both sides with the rag dampened with water. Then make sure it's dry and see if that doesn't help.

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1 Answer

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There is usually a sensor on one side or the other of the carriage. When you power up the machine, the carriage will be moved to that end, setting off the sensor. Then it will move back and forth to test carriage motion. If the end sensor is faulty, the carriage will still attempt to move until it triggers the sensor, but when it gets to the extreme end, the motor will continue to attempt to move it, causing the chatter. After a time, it will stop with an error message.

Look at the carriage where the cartridges are, and you should see some kind of tab or ear on it. If it's broken, then you may get the symptoms I mentioned above. Also if you can see the sensor, make sure that it's not broken or moved out of place.

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I'll start by explaining some of the components you need to understand to troubleshoot the carriage system.

The Carriage is the thing the cartridges are mounted in, it slides on the carriage rail, the bushings in most newer carriages are made of plastic, (or maybe it would actually be called a polymer, or composite material). The bushings are the pieces that wrap around the carriage rail.

The carriage rail is a shiny round rod that the carriage rides on, it is driven across the rod by the carriage belt, by the carriage motor, at the opposite end of the belt there is an idler pulley, ".

In a HP printer the device where the carriage parks, (sits at), when the machine is not printing is called the service station, it is responsible for cleaning the print heads, and for capping the heads when you are not printing, (so they won't dry up). The bottom of the service station is the "Spittoon Base", ink is spayed into the base before printing to prime the heads, there is an absorbent pad in the base to soak up the ink. Note that the pad does not always soak up all the ink, so if you tilt an HP printer you can spill the ink out of the service station, (especially if it is a heavily used printer). The piece that moves back and forth in the service station is the "Sled", it was wipers to clean the heads on it, and the caps that keep the heads from drying out are also part of this assembly. The sled is moved back and forth before the carriage leaves the service statio to wipe the heads, this happens after the heads are primed, then the carriage is moved off the service station and the sled is again moved back and forth to clean the wipers.

The encoder strip is a plastic timing fence that looks clear at first glance, but has black lines painted on it. The strip is threaded through an optical sensor on the back of the carriage.

When the printer initializes the carriage has to leave the service station, or, if the machine was powered off when the carriage was somewhere else, whatever spot it is sitting in, and travel the way to the other side of the printer, and then return to it's home position which is the service station.

When the carriage reaches the side of the printer away from the service station it sets that as a reference, then it counts lines on the encoder strip as it travels home, if it doesn't see enough lines before it gets all the way to the other side and can't move any more then the printer decides the carriage must have something blocking it.

Sometimes a service station will fail in a way where the sled does not retract fully, if that failure happens when the carriage is parked then the carriage will usually not be able to leave the service station. If the service station binds when the carriage is off of the station, then the station may not be able to move all the way to that side, and will detect a carriage jam. When the service station binds you might hear a grinding noise as it's motor tries to drive the sled back and forth.

If the encoder strip is dirty the printer may not see all the lines and detect an error, often when the strip is dirty the carriage will move too fast and slam to one side of the printer.

I use water to clean the encoder strips in HP printers, water works well on water based inks, if your printer uses ink with another base you might use alcohol, but "ONLY" if the ink is not water based.

One end of the encoder strip is attached to a spring mount, if you wipe the strip starting at the end that is attached to the frame, and wipe only towards the spring mount, then the strip will stay attached to the printer.

A dry carriage rail will cause the carriage to bind, if the carriage does not move fast enough a carriage jam will be detected. Some newer HP printers use grease on the carriage rail, many models use a liquid lubricant, Use "ONLY" light synthetic or silicone based lubricants on printers that use a liquid lubricant, Petroleoum based products may melt the plastic bushings and ruin the carriage. (YES, Petroleoum based means WD-40)

some HP printers have a timing disc on the service station, and if the service station binds, or the timing sensor fails they report a carriage jam, but as far as I've seen that jam always occurs before the carriage moves.
You can use a synthetic lubricant on the carriage rail :hope this helps

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Not sure but try a little oil on the carriage and move the assy back & forth a couple of times then clean the carriage off with a paper towle and try turning it on. does it still error out?

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Solution 1:
Move the printhead carriage back and forth a few times.

Solution 2:
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Solution 3:
Press the ink pads down in the purge unit.

Please come back and just gave a vote, it will gave me some satisfaction to know am helping some one so I will keep on helping.
All The Best: Pineworks

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