[image] Horizontal color streaks on i-SENSYS MF-8340Cdn printer output

[liotier]

Ever since I acquired it, less than a hundred pages ago, this printer's paper output has featured horizontal bands - the denser the color, the denser the streaks.

Take a look :

• Original test image
• Test image printed and scanned

The printer's diagnostics tell me that the ink cartridges are full. I see no contamination of any sort inside the printer.

Can anyone tell me what is going on ?

[Stephen]

Hello liotier!

Welcome to The Canon Forums, and thank you for your inquiry! We appreciate your participation, however we need to let you know that your product seems to be a model that is not supported by our team here at Canon USA. The Canon Forum is hosted and moderated within the United States by Canon USA. We are only able to provide support for Canon products manufactured for the US market. If you live outside the United States, please click here and select your country or region for your support needs. Feel free to discuss Canon products sold outside of the United States, but please be aware that you will not receive support directly from Canon USA.

[liotier]

The solution : I replaced them and the problem simply disappeared.  The cause : the 'starter' toner cartridge that came with the printer were defective. I probably should have started with that...