Question about Canon MultiPASS MP700 All-In-One InkJet Printer

3 Answers

MP 700 - paper jam indicator id always on, no paper acyually jammed

I had a paper that didn't go into the printer, removed it after the second try of printing a document. The paper was sliding in about 8cm but was then left at that position during the print operation. Has the ink drowned the paper-feed-sensor or what has happened?
Without too much violence I managed to remove some of the outer plastic shieldings of the printer, but still I can't reach the printheads, which doesn't show up in the normal area. Do anyone know which nuts & bolts to remove the scanner-part?

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  • Staffan  Svedin
    Staffan Svedin Jun 02, 2008


    1. remove paper inlet plastics

    2. remove 2 upper screws on rear cover

    3. remove 2 bottom rear screws on rear cover

    4. remove rear cover

    5. open printer (scanner part 45 degrees)

    6. white plastic spring-operated damper can be disconnected from scanner-part by pressing bolt from left side, while releasing hook on the same bolt.

    7. remove 2 vertical screws on front of the plastic cover (right hand side of the opened printer).

    8. lift up plastic cover and drag it out.

    9. left side of rear: disconnect scanner-connector and unscrew "earth" (blue).

    10. right side, rear part of newly uncovered main-board: diconnect flat ribbon-cable coming from scanner.

    11. lift in the rear right side until it comes off from the hinge.

    12. pull it (the scanner) to the right until it comes off from the left hinge.

    13. e voila!

  • Staffan  Svedin
    Staffan Svedin Jun 02, 2008

    It is now possible to reach the ink cartridges / printheads and it smells a lot of ink...



    But before saying anything moore I need to dismantle it a bit further...

  • Staffan  Svedin
    Staffan Svedin Jun 02, 2008

    Where is that paper-jam-senesor???

  • Staffan  Svedin
    Staffan Svedin Jun 02, 2008

    The last dismantling operations I'll do with this printer is done from the upside.



    I have tried to find a way to lift up the upper part without bending and breaking too much...no success story.



    Don't know if this is overkill, but I removed the front-panel and even tried to remove the front left and right plastics. Front-panel was a peace-of-cake but the L- and R-sides were not coming off. Now afterwards, I saw that they were screwed from the bottom of the inside... They are not neccessary to take away!



    After disconnecting ribbon cables and blue "earth"straps from and around the mainboard I managed to lift away the board and below there is a hidden screw that hold the parts together.

    In total there are 4 screw holding upper and lower part together. They are hidden in deep holes, two in the front and two at the rear.



  • Staffan  Svedin
    Staffan Svedin Jun 02, 2008

    Using a bit MLCA on the ink-drowned peaces might take away some of the problems. (Moonshine Liquid Cleaning Agent)



    To the right is the print head cleaning device. (jaeck...)



    Print head is coming off by first removing the ink cartridges, then lifting out the remaining part.



    But were is that paper-jam sensor???

    (thing are getting too small now-a-days)



    Cleaning things that could be cleaned easy.



    Start putting thing back where they should be.



    ...



  • Staffan  Svedin
    Staffan Svedin Jun 02, 2008

    ---> Clear Paper Jam



    -kiss my ...

  • Staffan  Svedin
    Staffan Svedin Jun 03, 2008

    Sorry, please refer to the first section, there are no paper in the printer, it was dragged in about 2-3 inches but never got into the printer mechanism.

    My guess is that one or more sensors got clogged or sprayed by ink when the paper didn't enter in a proper fashion and then the ink might have produced a short circuit at the sensor (ink is conductive).

    br /staffan

  • Staffan  Svedin
    Staffan Svedin Jun 09, 2008

    Sorry Mattozan,
    I recapture my own problem description
    and apologize for a, maybe, rude answer. The paper was removed completly as it did not ever enter the printer. Looks like the header got trunkated...
    br /staffan

  • Staffan  Svedin
    Staffan Svedin Jun 09, 2008

    Thread is still unsolved (open).

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3 Answers

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Most printers use infrared optical sensor with a plastic mechanical flag to detect paper position and timing. The sensor itself is most likely underneath the platen that the paper moves over, there might even me a few sensors. The sensor would be in the mid-section fo the printer before the printhead carriage path. What you need to look for is a plastic flag that hinges back and forth when paper pushes against it, this flag will then block the infrared beam underneath and indicate that paper is currently at that position.

I've quite often seen small pieces of paper get stuck in the flag causing it to always be blocked or to not allow any movement. Blow out the printer with a can of compressed air to try to dislodge any paper that may be stuck. The compress air should also be able to move the flag. I've sometime used a fresh sheet of paper or even card stock and fed it through the printer manually to see if it gets stuck on something. It has also happened that a flag has broken or snapped out of place, this may require that you disassemble the printer further to get to the sensor and flag. One thing I have never seen though is ink gumming up a sensor, they are always positioned in a way that ink cannot get to them.

Another thing that may be happening is timing issues. The printer uses timers to judge when paper should be hitting a certain sensor. If the sensor is not activated in a certain time then it will assume that a jam has happened somewhere before that sensor. I've seen that slippery paper pick up rollers will slip on the paper and not send it into the printer soon enough and the printer then assume a jam in the pick-up assembly. So clean your pick-up rollers also.

Unfortunately I cannot provide disassembly assistance having never seen your type of printer. Manufacturers don't usually provide disassemble instructions for ink-jet printers as they consider them disposable. I've usually had to guess how to remove the plastics and get to the innards as you have done. Good Job! They can be tricky as they aren't intended to ever be taken apart. With some perseverance you should be able to break it down further if needed. All-in-one units with scanners on top like yours can be especially tricky to take apart as the scanner is always in the way.

It's important to know, when troubleshooting jams, exactly where the paper stops and whether it's consistent or not. This will give you a good idea of the exact area that is causing your problem.

I hope that my advice has giving some direction and idea as to what you should be looking for. Good luck, and thank you for using Fixya.

Posted on Jun 09, 2008

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May be the paper sensor is not functioning perfectly
try by replacing the sensor

Posted on Jun 09, 2008

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  • 555 Answers

Is your paper still stuck?

Posted on Jun 02, 2008

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