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My problem is solved!! The problem once again: I picked up a used HP LaserJet M420n(I think this diagnosis would apply to any laser printer though). I put in an recycled toner cartridge and right off the get go I was hearing a steady high pitched sound(almost like my ears were ringing) that...

I appreciate the manuals very much. I ruled out bad toner cartridges so I’m thinking it’s either going to be the fuser or the high voltage power supply. I ordered the power supply as it was the cheapest option and will use the repair guide to walk me through the install. I realize that these...

Hoping someone can diagnose my problem. Just bought a "new" used HP laserjet pro m402n. Everything setup perfectly and it is on the most current firmware. It is configured to print through a network connection and I've purchased two refurbished toner cartridges. When I print a document it...