Printer and Photocopier Troubleshooting and Repair Collection : HP IID error code 50                    
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HP IID error code 50

(From: Tony Duell (ard@p850ug1.demon.co.uk).)

A problem on the DC controller (in particular C210) can cause intermittent ERROR 50's

Mechanical failures of the fuser will not cause ERROR 50 (AFIAK). After all, the fuser temperature is maintained even when the mechanism is not turning. A broken gear in the fuser will cause paper jams, but not much more.

If you've got the machine in bits on the bench, and you are SURE the fuser is not overheated, try shorting C211 on the DC controller board momentarily with the power off to clear the error.