I'm getting a large brown line about 1" wide all the way down the page. I just recently changed the drum, and it seemed to work fine for a couple of days after that.. Could it be a defective drum unit or does it sound more like the Fuser Unit?
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Check the drum life and replace it if near end. Clean primary charge corona wire if the drum is still new. Most likely the drum cannot be cleaned properly by the cleaning blade due to wearing or cannot be charged before developing due to dirty corona wire. If this cannot help check the fuser's hot roller for tearing/scraching and replace if necessary.
This is caused by dirt/debrise on the ADF (automatic document feeder) scanner glass. You need to open up the feeder where your originals are fed in and look for a strip of glass that runs from front to back. It is about an inch or so wide. You need to clean this glass to get rid of the lines. Some models have this glass just to the left of the large main glass, but in your case I beleive it is in the feeder itself.
Most likely you have a defective black toner cartridge. Open the front shutter on the black toner and look at the drum. If you see the drum has toner on it corresponding to the line down the page, you found the problem. If you can't see anything on the drum try printing a page and then interrupting the printout while the page is still in the printer. If you see the line on the page before it goes through the fuser, (the last roller thing on the top of the printer) then it still is the toner cartridge. If it occurs only after the fuser then it, the fuser, is at fault.
I have exactly the same problem with a Canon Pixma MP800, I have cleaned the rollers, changed the ink cartridges and reset the printer. It will print a few pages cleanly then dump black ink on the roller which leaves a heavy black line on the back of the page. It fades away after printing about 10 pages and then a few pages later appears again. The printer is two years old and it looks as if I must buy another. Should I buy another Canon?