Transferbelt gets dirty

[Cluemore]

Hello.

I have just cleaned the transferbelt in my ColorLaserJet-5500dtn and then I try to print again (see picture).

The result is the coloured lines on the paper and the transferbelt is again dirty (i.e. a lot of toner on it, see picture))

So there is something making the transferbelt dirty. But what?

What should I do next to identify the problem/clean/repair the printer?

As you can see, the toner cartridges have some dirt on them when the lid is opened just before closing (see picture)

Can that be the issue/acctual problem?

Or is the toner coming from somewhere else?

Edit: Seem to be a problem uploading the images.

Dirt on paperDirt on transferbeltThe acctual problem?

[Repairatrooper]

99% it is going to be a bad magenta cartridge

[Cluemore]

To exclude the 1% chance it is not the magenta cartridge, is there something else I can check before buying a new cartridge?

Like if there is a collector for excess toner or something else?

[Repairatrooper · Accepted solution]

These models collect waste toner in either the cartridge or the transfer belt. However if the transfer belt was the problem you would have muddy streaks not a pure magenta defect. Cartridge, there really is no 1% with this defect.

[Cluemore]

Solved it by getting new cartridges. Thanks.