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Re: paper has dark marks down middle
If you make a copy, does the copy have dark areas down the middle of the page? If so, remove the toner cartridge and gently roll it around to redistribute the toner inside, maybe even replace the toner cartridge if you've had it a long while. If you still see unevenness, you may need to have the machine looked at.
If the copies you make on your machine look fine, then I would suspect that the person sending you the fax has a dirty scanning element. Check with them to see if they can clean the scanning element and it should improve the fax quality.
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either dubree on the rollers or on the corona wires, wires clean with acalohol and q-tip, very carefully or you will brake the fire, look where the line is at and open the machine and locate where the issue is and remove and clean this area very carefully.
type in address bar
canon pc981 l170 a mark down the middle of paper
Sometimes turning it off and on again fixes it.However, we started having a problem where it would print out one page after you powered it back on again and then give the "incorrect paper size" message.I've found that by either holding down the green button or repeatedly pressing it while it powers back on (and held until the first page prints) fixes the problem.
I've seen this before. Since the printer portion is working fine that points to the scanner mechanism as the culprit. There are two things I have seen cause this.
1) If the line is a perfect rectangle all the way to the edge of the page then the light bar itself is dying and there isn't much you can do to save the unit. Send it in for warranty repair if you have the option.
2) If the line is more like a skid mark like you mentioned, then the paper that is being scanned is not pressing up fully against the light bar. Not enough light is bouncing off the page and the scanner can't read it well. This can also be caused by a roller not feeding correctly and then bunching up the paper a little bit. I would check the rollers for wear or something being off center. This can sometimes be caused if the machine has ran a high volume or thick paper.
I would really think the cause would be one of these two since you are getting the marks at odd intervals, if the intervals were regular it could *possibly* be the drum but as I stated before, with the print function working right, I doubt it.