Sharp AR-M550N that is jamming from trays 3,4,5 on 8x11r, 8x14... trays 1 and 2 no issues. If you change the paper to 8x11 on trays 3,4,5 it works good, no jamming, no registration issues. The jam codes are as follows- PPD NM2, PPD NM1, PFD2 NM2, PFD NM2. The paper gets jammed in the vertical transport section before it makes it to the PS roller unit, basically just below the left-side jam door. If you run the paper 8x11, through trays 3,4,5, it does not jam. We have replaced tray 3 feed unit, and the paper detect sensor in the vertical transport unit, still no dice. Our next step is replacing clutches in the back but not sure if this will fix the issue because my thoughts are... if it is a clutch issue, would it not still jam on 8x11r and 8x14, through these trays? The registration is perfect on 8x11 through all trays, which leads me to believe the PS unit and clutch are good. The box has less than 500k on it. Any thoughts?
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