Streaks (thicker lines) indicate faulty PCR Roller which is located behind the green drum inside the cartridge. As the printer has 4 cartiridges, you have to identify the faulty one. You may replace the cartridge or get the PCR Roller changed by a professional.
Let me know if any further clarification is required. Hope this helps!
CreatuiveTECH
Testimonial: "Thank you, your solution was right on the money. It was the Cyan cartridge."
There are a few things you can do to try and fix this. First thing would be to check the toner level, sometimes when the quality of prints drops, it's because of low toner, even the streaks. If the toner level is ok, you will have to clean the printer and the drum kit.
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