When the paper is fed from the two-tray wide LCT (Vacuum Feed LCIT RT5100), the static electricity produced by friction between the conveyer belt and paper may hamper toner adhesion on the paper, resulting in a horizontal band appearing at the vacuum port position.
This may occur if:
Synthetic paper is used
Transparent film is used
To adjust the following settings, pre-register the type of paper in use as a custom paper. For details about registering custom papers, see "Registering a Custom Paper", Paper Settings.