Laserprinter draws a black vertical line over the whole page. Which part can cause this problem?

What can cause this problem? Please see the black line. If I make 10 separate prints, the page is 10 times the same, so: including the line with the same thickness. When I make 10 prints at once the line gets more invisable per page. Please see the difference between page 1 and 10.

I already replaced the black drum with a new one: problem still persists. I also noticed the problem still persists when taking out all coloured drums (printer still works) and only having the new black drum inserted. Same problem.

Page 1:
Page 1
Page 10:
Page 10
Anyone any idea what needs to be replaced?
AgrippaSenior IT ConsultantAsked:
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JohnBusiness Consultant (Owner)Commented:
Stuff like that but the printer does need to be cleaned inside
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JohnBusiness Consultant (Owner)Commented:
That is likely now a problem with the fuser (dirty). This part can be replaced as well, although you may wish to get a local printer repair person to do this. They can completely clean the printer at the same time.
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AgrippaSenior IT ConsultantAuthor Commented:
Hi John,

I noticed that the "dirt" is on the page before it reaches the fuser.
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JohnBusiness Consultant (Owner)Commented:
Then the printer needs an internal cleaning since the replacement drum did not fix anything.
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AgrippaSenior IT ConsultantAuthor Commented:
I can see that the line is on the transfer roller, but WHAT is it that makes the transfer roller pick up the toner to transport it to the paper.
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JohnBusiness Consultant (Owner)Commented:
There is dirt (laser printer dust) that is attracted to the drum.
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AgrippaSenior IT ConsultantAuthor Commented:
It is a toner line, not random dirt / dust. Something makes the transfer roller pickup toner, that must be the problem.
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JohnBusiness Consultant (Owner)Commented:
Yes  (laser printer dust) as I noted. Leaking out of the toner cartridge most likely.

The only way to fix this is to clean the printer inside. Normal laser printer maintenance.
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☠ MASQ ☠Commented:
Fuser sleeve or transfer unit - likely something sticky has got in.
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☠ MASQ ☠Commented:
Not necessarily, an even amount of toner is exposed to the whole width of the paper, if there's no charge then nothing should be applied but if you've got any roughness or a tacky surface toner is picked up by that, not the electrostatic action.  If you print multiple pages in quick succession then the sticky area gets saturated and no more toner gets dragged onto it so the output defect seems to fade but if you pause the printing you're back to where you started.  There doesn't have to be free toner floating around inside the printer to cause this to happen.
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AgrippaSenior IT ConsultantAuthor Commented:
I have taken a picture of the inside, see the line over the whole transfer roller. I cannor "leak" out of the toner, because the toner is under the transfer roller. Also: I replaced the drum / toner as a whole and the problem persists, so the toner / drum as well als the fuser are not the problem. De line is already on the paper before it reaches the fuser.

When I fully clean the transfer roller (all glossy afterwards): the line gets back, it picks up toner once more.

Inside
Outside
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serialbandCommented:
The electronics on the transfer or fuser roller may be getting bad.  You'll have to replace that.  It may be retaining an electrostatic charge because of a failure of that portion to turn off fully.

There may possibly be a temporary fix if you also have a plastic "scraper" that can be adjusted to scrape off the excess static.  On old laser printers, those get worn down a bit, but can be adjusted/curled to touch the roller better and reduce that streak.  I did that on a Minolta copier long, long ago.
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JohnBusiness Consultant (Owner)Commented:
Yes . That is why I suggested a local printer servicer . They can pick these things out and normally do economical repairs
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AgrippaSenior IT ConsultantAuthor Commented:
I have asked one, I will let you know the result.
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AgrippaSenior IT ConsultantAuthor Commented:
So, the printer expert checked it out. Is was due to "copy" toner, not the original brand. As he told me they resolve many issues like the just bij replacing (and cleaning the printer at the same time) toner with the original brand.
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AgrippaSenior IT ConsultantAuthor Commented:
THankx
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JohnBusiness Consultant (Owner)Commented:
Thanks for the update.
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