Needle thin parallel lines appearing on my photo prints - Canon Prixma TS9550

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Dec 19, 2025
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My Cannon Prixma TS9550 inkjet printer is giving me dark needle thin uniform (1 cm apart) multiple parallel lines running horizontally across all my photo prints. I’ve done all the tests. Checked and replaced inks. Deep cleaned the nozzles, even manually cleaning, aligned the heads, changed paper etc

Test nozzle sheets are fine. It’s only visible on printed photos. Printer only 4 years old. Can anybody advice please.
 

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