Line appears on copies when using the automatic feeder.

Hello, Either toner cart. for fusing unit is bad. Here is website for manual download.
Canon imageCLASS D860 Basic Manual

Clean the adf glass ( it has some kind of plastic sheetover glass, its easy to remove ). CLEAN VERY WELL.

The adf is the automatic document feeder and its located on top of the machine. use a clothe with 409, simple green or water and look in where you put your copies to be copied. You will see 2 grey rollers. wipe them off. NO alcohol Also are the marks on the docs you are running through the adf or comming out of the copier. Steven 818-888-0006

Yes you do- look harder

smudges of ink on copies

Lift the document feeder and clean the narrow glass, (next to the glass where you place your originals). Documents are scanned across this glass when automatic feeder is used, thus a small piece of dirt becomes a line down the page.

The lines are caused by some debris that is on the platen (the glass where you normally place the copies). The usual culprit is white-out smudges from a copy that wasn't completely dried yet. When you make copies using the feeder, the roller passes the paper being copied over a little section of the platen (if you pull up the feeder "lid", it'll be on the right-hand side of the big glass... it might even be marked with 2 green arrow stickers, but if not, it's the part of the glass directly under the roller of the feeder). You can just take an alcohol wipe or soak a cotton ball with alcohol or windex and wipe down that strip of glass under the roller.

If your copier has an automatic feeder and your line is present when using the feeder but not when you copy from the glass,just clean the small glass at the point where the line appears.

try cleaning the feeder glass

YOU HAVE TO CHANGE THE FIXING UNIT.