I have getting smears on my pages. THey run vertical and look like a paint brush has been swiped down the page. I can still read the printed page but the SMEARING marks are very obvious

In the process used printer, will be inevitable printed page by your printer have the bad quality prints. For example: Toner specks, Light image, Vertical line, Dropouts, background, Toner smear, Vertical black line and band, Vertical white line, Background scatter, Black pages, Loose toner, Horizontal stripes, Ghost, Uneven Density, poor fusing.

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carriage problem

The print-head is like a paint-brush -- it paints many "rows" in one swipe across the page.
So, some of the ink-jets in the print-head are clogged.

Run a few print-head-cleaning cycles to try to unclog all the ink-jets.

The print-head is like a paint-brush, in that it prints a "band" as it goes across the page.

In your case, some of the ink-jets are CLOGGED, and thus are not shooting ink as the print-head moves HORIZONTALLY across the page.

Run a few "print-head-cleaning-cycles", to try to unclog those ink-jets.

The print-head is like a wide paint-brush going "across" the page.

If some of the hairs on the paint-brush have no paint, then you get "strips" of paint.

Similarly, for your printer, some of the ink-jets are clogged, resulting in "strips".

Use the software supplied with the printer to run a few "print-head-cleaning" cycles, to try to unclog those jets.

The ink-jets are like a wide paint-brush, painting a "band" across the page.
If half of those ink-jets are clogged, or only half of the paint-brush has paint,
then only half of the "band" will be "painted" onto the surface.

So, run a few "print-head-cleaning" cycles, to try to UNCLOG those jets.

I would try a new print cartridge. There should be a cartridge cleaner built into the machine settings. Also the ink reservoir might need to be cleaned.

I’m happy to help further over the phone at https://www.6ya.com/expert/eric_7148ad2a373711a3

The toner cartridge sounds like the problem to me. Did you refill it? Or have it done? It sounds like an incompatible brand......toner is very model specific, and not just 'any' will do, and it often doen't mix well with the remaining toner i the cartridge if it is not completely disassembled and cleaned out. Just curious

Looks like the ridges inside the cartridge are catching. Here's a solution;

http://www.ahfx.net/weblog.php?article=133

We were having a lot of print quality problems, similar to what you describe. We replaced the drum and it worked fine.