Hi i am a certified Canon tech on this copier. the problem you have is due to the scanner cable that runs from the top of the scanner to the main board in the back of the machine. what happens is when you take the scanner unit off to get to the fuser screw holes the cable should be removed from the main board under the rear panel with alot of screws. some people when they put the scanner unit back on they dont watch the position of the cable and when the unit slides back to open the cartridge door the cable is pulled part way out of the board connecter. the first thing i would do is to remove the back cover and chech the connector for the scanner cable to see if the cable is in all the way. also sometimes i have found that some one has pinched the ribbon cable damaging it underneath the scanner and replacing it with a new cable took care of the problem. the cable cost around $20. hope this helps.
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There is usually what looks like a large screw head either under the top cover that you lift to insert an original onto the glass, or somewhere in that area. It will have two symbols, a closed lock and an open lock, or better yet, the words "lock" and "unlock." This keeps the carriage from bouncing around while the scanner is being moved. Use a quarter or a screwdriver to rotate the screw head to the unlock position. Unless you are traveling with the scanner, leave it unlocked.
Solid dark colours can sometimes be a problem.
Try playing with the media settings. For instance, if you are set to say thin
card stock, try changing it to plain paper.
If you think about how the fuser works it may help.
For plain paper, the fuser temperature is set high and the paper travels
through fast. If you set it to card stock, the temperature is reduced
because the card travels through slower thus preventing it from getting
too hot as it is exposed to the heat roll for longer.
Also, it might be worth trying a different paper stock.
Hope this helps.
if paper goes through the device in portrait or A4, check fuser entry guide. if page travels through the device landscape or A4R look for obstructions that could disturb toner on the surface after drum but before fuser
The serial number is located on the guide for the print head holder. Open the cover, as if your going to change the ink. To the right of the print head holder (where the ink goes), on the guide that moves the holder back and forth, there is a white label with the serial number. The number starts with four letters and ends with five numbers.
There are a couple of things that can cause this fault.
The most common cause is a paper jam has occurred, and the user hasn't gotten all of the paper out. Lift the lid, use a light to look into the left side of the head travel area. Make sure there is no crumpled paper. If not, carefully move the head all the way to the left and try to look at the right end of the head travel. Look for crumpled paper again.
If you cannot find any paper, the encoder strip may have become dislodged. You will have to take the machine apart. Open the lid, remove the wid=re civers with a small flat screwdriver. Remove the prop rod (blue piece holding the lid open). Unplug all the cables and unscrew the ground wire. Move the scanner off toward the rear.. Remove the rear cover. Unscrew all screws in the top cover assy. Hinge the control panel outward and remove carefully. inplug any attached cables. Use your scrrewdriver to unlatch the two tabs at the front and pull the upper case assy up and off. Look at the print head. There should be a plastic strip going from left to right that is seated in a sensor on top of the head. Make sure it is seated correctly. Remove any crumpled paper. Reassemble and test.