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https://www.youtube.com > watch
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1:05
No audio. Learn how to clear paper jams in the 13.B9, 13.B2, 13.FF fuser for HP Color LaserJet M65x, E650xx, E651xx and MFP M68x, E675xx, ...
YouTube · HP Support · May 19, 2020
https://support.hp.com > ca-en > document
13.A3, 13.B2 jam error in the optional 550-sheet trays. Learn how to clear a paper jam in the optional 550-sheet trays on the printer.
https://www.youtube.com > watch
PREVIEW
1:05
No audio. Learn how to clear paper jams in the 13.B9, 13.B2, 13.FF fuser for HP Color LaserJet M65x, E650xx, E651xx and MFP M68x, E675xx, ...
YouTube · HP Support · May 19, 2020
Missing: m578 ' Must include: m578
? 1:36
https://www.youtube.com/watch?v=lpTj4jiLaY8
Dec 12, 2011 - Uploaded by BrokenPrinter1
Parts Available @ BrokenPrinter.com how to fix and replace the rollers on a hp laserjet 4345 mfp and color ...
? 5:40
https://www.youtube.com/watch?v=ZXtAhSDYqyU
Jan 23, 2013 - Uploaded by HP Printer Support
Learn what to do if your HP printer does not pick up or feed paper from the ADF when you do have paper loaded, and a Doc feedermispick error message display... ... FIX YOUR PRINTER: ERROR: Printer Does not Grab Paper fromTray ... Kit m3027 mfp- Kit Hp m3027 mfp - Kit Mantenimiento m3027 mfp ...
Reset the NVRAM, HP support and google the procedure.Also, may be physical defect from the printer:
- ITB
- Fuser
- All cartridges
The only other parts involved with imaging would be the laser itself, or some kind of power problem where the laser isnt getting charged enough. You could try plugging it into a different wall outlet without a surge protector to confirm power source problems.
The imaging drums should all be included in the toner cartridges. They should have been ruled out when you swapped them before, its also unlikely all 4 drums would go bad at the same time.
Also, are you using refills or OEM cartridges? It shouldn't matter but refills/refurbs can have some strange defects. If you have a spare teh same model of printer lying around you could swap the cartridges out from a working machine and see if the problem travels with the cartridges or not.
Regards, Mike
50.21 error is a "cyan scanning error" Manual says to replace the DC Controller. Get a tech to check it out, and if you want to get the printer printing again, listen to him.
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