Question about Canon PC-940 Black and White Copier
The machine displays this info: paper jam open the left cover.
but there is no paper hanging or hooking anywhere inside the machine.
I have some GENERIC suggestions, but as I work on competitor products, I am not familar with the specfics of your machine. So this may or may not help. If something in this post doesn't match up with what you see, disregard it.
Generally speaking paper jam messages are generated because the sensors in the machine either see paper when the should not, or DON'T see paper when they should. "Ghost" jams are usually caused by two things: either the paper is not feeding properly from the paper tray or a sensor is "confused" because it is bad, broken, or covered by a small piece of paper.
If the machine indicates a jam in an area of the paper path close to the paper tray, it is likely that paper is not feeding from the tray at all. If you have an alternate paper source, such as a second tray or a bypass, try feeding from that source. If you are successful, the problem is probably misfeeds from the tray that doesn't work.
In that case, inspect the feed components in the tray (feed rolls or feed tires as the case may be). See if anything looks out of place. Sometimes feed tires can twist or slip and can be put back into the proper position. If the machine has two similar trays, you might be able to compare the two. If you can, remove the tray and see if you can locate the actuator for the paper empty switch. (It will probably be a plastic lever hanging free to ride on the top of the paper stack.) VERY CAREFULLY (you don't want to break or dislodge anything) tape the lever up in place (to fool the machine into thinking there is paper in the tray) and then inspect the feed components while you attempt to make a copy. (Be sure the tray you are watching is selected as your paper source.) If the feed components turn, you probably have to replace the rolls or tires. If not, it may be that a feed clutch or solenoid is not working.
If you cannot get a successful feed from any source, you may have a sensor problem. This might be a bad sensor, a broken actuator or a very small piece of paper stuck on a sensor. This latter problem happens when someone pulls out a jam. The paper tears on the sensor actuator and leaves a small piece in the sensor. Look around the area where the jam is indicated and see if you can find the sensor actuator. It will be a small plastic "finger" or lever (it may only be a few millimeters) typically with a small spring on it. BE CAREFUL not to dislodge or break it. See if there might be a small piece of paper (it, too, may be just a few millimeters) on it or anywherer else in the paper path. If you see something, carefully remove it with tweezers or a similar tool. Again, be very careful not to break or dislodge the actuator. If an actuator is dislodged, you may be able to pop it back in place, but if the small spring has fallen off, it might get tricky. The end result is that the actuator should move freely and spring back into place.
The truth is, unless you see something obviously out of place, or you are exceptionally mechanically inclined, it is probably best to get a service tech in. Again, these are generic tips, but I hope they give you some help. Good luck!
Posted on Apr 03, 2008
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Posted on Jan 02, 2017
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Mar 23, 2016 | Canon iR 2016i Black and White Copier
Do not touch the clear film (A). If the paper or your hands touch these parts and blot or scratch them, the machine can be damaged.
3. Make sure that the FINE cartridge holder does not hang over the paper. If the FINE cartridge holder hangs over the paper, move the FINE cartridge holder to the right edge or the left edge whichever is easier to remove the paper. When you move the FINE cartridge holder, hold the FINE cartridge holder and slide it slowly to the right edge or the left edge.
4. Hold the jammed paper with your hands.
If the edge of paper is jammed near the paper output slot, pull the edge of paper to the position where you can hold it with your hands.
5. Pull the paper slowly not to tear it, then pull the paper out.
6. Make sure that all the jammed paper is removed. If the paper is torn, a piece of paper may remain inside the machine. Check the following and remove the piece of paper if it remains.
7. Close the paper output cover, then reload the paper.
All print jobs in the queue are canceled. Reprint if necessary.
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