Error c-0510 shows on screen

Code C-0510 means a low fuser temperature. Most probable cause for that - the fuser lamp is probably defective. Try first to clear the error code (if the lamp is close to its life's end the code may pop up after a long print) so do this: power machine off; turn on the machine with the stop key held down; turn off, then on again. If this doesn't fix it then you need a new fuser.