Mx-7580N calibrate pattern showing randomly on 2 side of single side print

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  • GramPaBo
    Technician
    • Jul 2018
    • 12

    [Electrical] Mx-7580N calibrate pattern showing randomly on 2 side of single side print

    Good morning all this is a very unusual issue on a Mx-7580 and recently lost our support from sharp but my job is still to fix the machine

    - I am getting Small black rectangle on back of single sided prints (calibration pattern?) - followed on next page usually by same size rectangle of CMY 1 each across page- about 1/2' x 1" -
    (car in garage currently with the pages showing issue)

    all drums are relatively new and clean - both belts are new - registration / calibrate sensors under belt were just cleaned and drum grounds all have fresh dielectric grease

    did 44-2, 50-22, 44-27, 44-6, 44-26, 46-74 all with no issues after cleaning

    Has anyone seen a similar issue or know which board would be generating this pattern?

    Thank You all in advance for your assistance!!
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