Puts black streak down side of page is this major or just cleaning issue

Open the cover where the documents are loaded and clean the thin glass there. It may have some white out or dirt on it.

Let me see if I got this right.

The received fax is clean but when you send one out it has a black streak on it.
Cool! So far so good.
Makes sense because for sending, the fax scans the original document and parts of the scanning area could be dirty and so on. Therefore a black streak may appear.
The same black streak would also appear when you make a copy, because the original document must also be scanned.
Logical!

However for receiving faxes, the machine uses the internal memory and the print engine only, and the same applies to printing the transaction report, which comes from inside via the print engine.
The scanner has no rol in either situation.

Now I'm lost!

.

If it's a spotty line, that most likely points to the fuser. Maybe something tore the belt or scratched the roller in there.

there should be a black thin wire with a button to move over that wire that cleans it. I would also take out the toner and make sure there is no stains there

Hello.

It might be as simple as changing the ink. If still a problem, the FAX may need cleaning.

Hope this helps.

Hello! Malik Muhammad Mehran Here... your problem solution is that you must replace the cleaning plates in the cartridge...

Issue with the duplexer... could be as simple as cleaning the rollers and things inside the duplexer.. or could be something major like replacing it.

Don't have a definitive answer.. sorry.

I was going crazy! Had a tech come in and look at the machine - needless to say he did NOTHING! A friend came over and was trying different things. It was that the "rack" that the toner cartridges sit in was not fully seated - once he pushed down a little and heard it "click" I had no more black streaks. AMAZING

The streak is most likely the toner or the fuser

This is the test to determine toner or fuser issue.
Print a test page
When you hear the paper feed into the machine open the top or front to stop the machine
Remove the toner cart.
You should be able to see the page with printing on it. (This is before the page hits the fuser)
If you can see the defect on the page the problem is most likely the toner cartridge but NOT the fuser.
If the page is clean the problem is most likely the fuser.
Hope this helps

I've refilled the toner cartridges a few times now and never had a problem with vertical streaks until recently. I refilled both the cyan and magenta and when I ran the test page I had dark vertical streaks on both sides. I fiddled around cleaning things, running cleaning paper through, changing reset resistors but to no avail so eventually decided to buy a replacement refurbished cyan cartridge since the streaks looked mainly blue and bingo... well almost now I just have very light magenta streaks. The issue is obvious when I compared the old and new cartridge, the replacement toner is a much duller cyan and is of the wrong consistency since once it's been in the printer everything gets covered in it which is why I think it causes the banding to occur. I'm just trying to work out now whether to try refilling the magenta again (v. messy) or just go for another refurbished cartridge (£34).