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When a relatively stiff, thick paper is delivered, the entrance guide board for the transfer unit is warped toward the intermediate transfer belt due to the stiffness of the paper. The edge of the entrance guideboard comes into contact with the toner on the belt to cause images to be scratched and paper edges to be stained.
This may occur if:
Paper with a thickness equivalent to Paper Weight 7 is used
Paper with its grain parallel to the paper feed direction is used. For example, A3/DLT long grain paper is delivered, A4/LT short grain paper is delivered from its long edge, or A4/LT long grain paper is delivered from its short edge
Paper is stored at low temperature or humidity
