Have you ever looked inside a fax machine,I swear they are held together by rubber bands and little springs.I tried to fix one once and when I got through with it .It wouldn't work at all.Never again.
If you get a lot of faxes ......What I did was put in another fax line and have the 1st fax machine hunt to the other.
I think Ricoh makes a better than average fax machine.