50.0 can mean either the fuser has suffered an unrecoverable failure or, the power supply is failing. 95% of the time, it is the fuser that is failing. A rebuilt fuser is more economical and their are very good companies that do just that. The best I have seen that is certified by Hewlett-Packard is PARTS NOW!. They are located in Middleton Wisconsin and they are very reputable. I would check out their website:
Laser Printer Parts HP Lexmark Canon Ricoh Parts Now
I have personally been trained on several models of color & black & White HP printers at their facility.I have seen their factory floor where they refurbish the printers and their components.
Best of luck to you.
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