Heavy black line

Hi there
This is a leak from the ink or it is your waste ink pads full, you will have to clean all the inside out, the ink getting on to the rollers.

All the best Pineworks

No black line while you scan, but it only appears while you are printing?

Black line.....there are 2 smaller rectangular glasses that the pages are scanned through. When you lift the ADF you will see one of them next to the large glass platen, the other is on the underside of the ADF. Clean these with a wetwipe or alcohol.
The pages not being stapled, on the exit tray where the pages come out after being stapled there is a set of black rollers near there that get dirty and will not feed them into the stapler easily, you can clean these with WD40

Ink tends to overflow at the bottom guide rollers and the roller gets coverd in ink and causes the black line!The best will be to take it to a dealer and have it cleaned!Good Luck!

Cleaning only made it worse. The ink is coming from the cleaning assembly, and you need a shop to clean up the ink and install a mylar shield to keep that from happening again. The ink absorber gets plugged and the ink comes up thru the exit rollers.

Clean the charge corona wire/charge corona roller and the charge corona wire gride,and the transfer/separation corona wire/roller.After clean the units and clean the optical section perform the auto image adjust mode.

If the line runs the way that the paper does I.E. vertical on a portrait then it is dirty rollers normally.
If you open the lid and wipe the rollers this shoukd reduce or eliminate the black lines.

Hello,

This issue can be due to fuser. I am sure you have changed the toner cartridge.
To confirm its a fuser issue, please perform the following:
1. Try printing a configuration page from tray 1, pull the top cover, as soon as the media is 60-70% inside the printer.
This would stop the paper before reaching the fusing assy.
2. Remove the paper and check if the line exist.
If exists, fuser is not faulty.
If it does not, then transfer roller, laser/scanner assy is faulty

- If fuser is faulty, perform the cleaning page as following
1. go to configure device > print quality > create/process cleaning page
perform cleaning page 5-6 times, however, if the line is due to fuser, then fuser needs to be changed.

Let me know the next update.

- Nikhil

the rollers / guides the the underside of the paper touches

Is the line on the front of the page or on the back? If on the back, you need to clean the platten which is the piece of plastic under the paper.

If its on the front, and you say "It lools like a rubber cover may be missing off of one of the rollers", could you upload a picture of this roller? I don't recall any covers on rollers in Canon printers.

Try this, print out a blank page. If line is still there, print out 10 blank pages. If line is still there and has not faded, this is unusual and may need servicing. There may be a problem with the encoder strip (it's a clear plastic strip with black lines running the length of the printer slightly behind the head), Try cleaning it on both sides with a little windex on a q-tip. It's delicate so be careful.

If the line looks faded after printing 10 blank pages, some ink has dripped onto something that is contacting the paper. This could be a roller, the bottom of the head carriage or even a hair or piece if dust that is stuck in the machine or on the bottom of the head. In this case, I would recommend cleaning everything. Revove the head (tell the machine you're going to replace ink, and when it moves the head into the centre position unplug the power cord.

Remove the head and clean off any dust or hairs on the bottom. Run a Q-Tip along the bottom of the carriage assembly wherever you can. Clean any accessable rollers. If you can get at it, clean the wiper on the purge unit (the unit the head sits over when it is parked), as well as the seals.

Reinstall the head and ink, close the lid, power up and retry printing.

I hope this helps. If not, there could actually be a fault with the printhead or one of the circuit boards