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I have an HP color laserjet 3550 and I keep getting black marks (a lot) on the prints - I've emptied the toner overflow container and cleaned the roller
Re: I have an HP color laserjet 3550 and I keep getting...
The issue with roller (Drum) It's in (Blue or grenn colour). Replace the toner with new one or replace the toner drum any toner reffling, repairing shop.
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Very few printers will print if they're out of toner, even if the colour toner is exhausted and the print job is only black. Replace the empty toner and if this is the only problem, the printer will continue printing.
Mostly black lines prints due to problem in the Black toner cartridge. remove the Black toner out and inspect the toner drum, whether are their any black patch on the toner drum. If it so there's a problem in the black toner. Replace a new black toner and check.
The 3550 won't print in any color if any of the colors are out. You'll have to replace the color ink that's empty to get it to print.
In the future, if you're just printing black and white, you can select "Print in Grayscale" from the print properties to just use the black ink cartridge, which will help the color cartridges to last longer.
I generally use small soft-bristle brushes to move the toner to locations where I can easily get to it with a small hand-held vacuum unit and just **** it right out.
Check the black toner cartridge. Most printers that use multiple cartridges will use the black cartridge as long as it has toner in it but will then start using the color toner to do the black/grayscale when the black cartridge is empty.
Try changing completely or at least first cleaning the glassy surface of the toner cartridge first. You can do it with a cotton swab by sweeping the black toner from the surface while manually turning the gear on the side of the cartridge.
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