I have a Cannon DR-C125. All of a sudden a message has started coming up that reads "A double page-feed has occurred." (-4619) I have not changed anything I have been doing. This is one sheet of letterhead.

Yeah so I just figured out how to fix this and it took me forever, but I figured it had to be an issue with Windows since it happened more than once. Here's the solution that made the power cycle (-4400) error go away for me:
1. Open up a Run box by holding down the Windows key + R. Next, type "services.msc" into the Run box and press Enter to open up the Services screen.

2. Scroll down through the list of services until you find the Windows Image Acquisition (WIA) service.

3. Right-click on it and select Restart.

read this -> http://dr-notebook.blogspot.com/2012/02/acer-as-4551-no-display-jalan.html

If you have it set to certain paper weights or manual feed that is all you will get. Change the settings from the printer monitor back to normal weight paper or text not high quality graphics and it should feed again.

did you change o/s //some cases you need a different driver/check their home page(cannon)//oz

Clean the rubber rollers (pickup and ******) with a damp cloth, loosen the papers to be scanned. Clean all the rollers in the scanning path. What is the eror that is displayed? Download the user manual from this site http://www.usa.canon.com/opd/controller?act=OPDSoftwareAct&fcategoryid=2341&modelid=11293 (5010um.pdf). Change the rollers if they are old.
S. Mohan, Chennai, India

The exchange roller kit has all the tires that pick up the paper in the kit (feed, separation, and pick up tires). I think the other tire you are talking about is just one tire not the set.
Also check to see a switch on the scanner that is used for single feed or multiple feed. If its on single feed it will multi feed all the time. You can clean the tire with rubbing alcohol too, to see if your double feeding goes away.

there should have a wheel (knob)right on the paper exit area, just close it , paper will be come out to front

Check the location where you are directing the scanner/computer to store the scanned image. If it is full, obviously it cant store. Change the location where there is space.

S. Mohan

Do you get an error message after the first scanned image? If not, check your software settings to see if you have the option of single page /multipage scanning. Some software lets the customer choose a single page scan when the SCAN button is pressed.

Check the "Feed Select Lever" to make sure it is in mutifeed position. If not, it will grab all of the docs at once.

Is there a gear grinding noise associated with this? If so, call your local dealer for service. If not:Clean all the rollers you can reach with a cloth dampened with alcohol. Check for any obstructions in the paper path like torn paper, heavy toner buildup on guide plates or the edges of the scanning glass, or any paper guides obviously loose or out of place.