(From: Tony Duell (firstname.lastname@example.org).)
|Printer and Photocopier Troubleshooting and Repair Collection : HP IID error code 50
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A problem on the DC controller (in particular C210) can cause intermittent
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.