Copiers, Printers, MFP's

Can anyone suggest what causes these lines across the page? Is a new toner cartridge likely to fix this? Edit: Line separation is 62.5mm Edit 2: Thank you to everyone who replied. I've ordered a new toner cartridge and will update this if that solves the problem 🫡 Final update: A new toner cartridge fixed it. It's now printing perfectly! Thank you.

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I'm trying to get an iPhone to see a HP MFP via AirPrint. The printer has wireless installed and can accept a print from an Android phone, it can also accept a print from said Android device via WiFi-Direct. What do you have to configure, all I can find is a bunch of priority settings that I don't quite understand, like lpd auto & lpd raw. Anybody have any clue why our E77830 doesn't show up on an iDevice?

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I work for a company that sells, fixes, refurbishes copiers. We're not the manufacturer. With the exodus from reddit I thought i'd try to make a page for us poor souls here. Specifically I work in the IT department, it's up to me to get our clients printing and scanning.

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