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While the line is showing up on the output pages. Stop printing and put paper in the manual feed tray (tray 1). Start printing again. As a page gets pulled into the printer about 1/2 way open the top cover. Pull out the toner and look at the page inside the printer. If it doesn't have the grey/black line, get the fuser replaced. It is defective.
For 34 Short Paper error, reseat the tray guides and make sure it is set properly. Also, set the correct settings in the computer. For blank pages, always double-check the paper settings and again the settings in the computer. For not printing black, print the Print Quality page and see what color is not printed or not showing. If Print Quality shows black, try printing any document from any application in the computer. Check if you still have the problem. If problem is not resolved, leave a comment so I can get back to this.
If the unit print lightly or not printing anything at all?
The most common causes for not printing ECGs is one of those:
1- Too little heat on the stylus
2- Insufficient stylus pressure on the paper
1- Using an insulated probe, such as a screwdriver, gently press the stylus onto the paper.
2- If a dark line appears on the paper, the problem is too little pressure, but if no dark line appears, the problem is not enough heat.
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?