Panasonic KX-FL501 Plain Paper Laser Fax "verical lines" Questions

verical lines of inconsistent or un-even printing, how do you clean this fax machine? It has verical lines of inconsistent or un-even printing In almost every case, the problem you describe can be ...

...lines. I have cleaned the glass, rollers etc, but these look system generated. TYPICALLY SF900 FAX USES A DIFFERENT CIS SCANNER , THSI SORT OF INDICATION IS EITHER SMPS BAD OR CIS SCANNER BAD. HAPPY ...