How to check a printer fuser unit

How to check the fusers of a printer or a copier: upper fuser roller, lower fuser roller, heater roller, fuser sleeve, thermistor, heater lamp, heater element. How to identify where's the problem when a fuser unit is defective.

For any question or suggestion leave a comment
-----------------------------------------------------------------------
email: link.accessori@libero.it

other links:
http://www.emmegiricambi.it/
http://store.hp.com/us/en/cat/printers
http://www.brother-usa.com/printer/#.VuQbWOZghlw
-------------------------------------------------------------------------

Видео How to check a printer fuser unit канала viandant5