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Thanks skiguy for your time and help. Update: I replaced the waste cartridge. I ran 10-15 blank pages and they came out clean. Then i printed a tabloid page of graphics and streaking was there. I scanned the streaks if you're in any mood to take a look -- I can email a jpg. Again, I fear the...

Here's our school's sad story: Our 780 was printing beautifully until last week when prints started to show a streaking pattern (90 degrees from paper travel). The streaking has gotten worse and I measured the pattern -- 20 cm. I know it's not the imaging unit because I swapped it out with a...

I'm not a tech; just a user looking for some answers but saw your post and received the same error message, after using the pressurized air can to clean dust out of my 780. After many power off/on's still received error message. Took covers off and located density sensor but was too scared to...