Cause
This problem is caused by toner unevenness created when clear toner images are superposed for part of CMYK toner images.
When paper [A] is transferred from the Intermediate transfer belt [B], some toner is not transferred due to toner unevenness. This results in unprinted areas around clear toner images. This problem only occurs in FCS or FCS Quality mode.
This is likely to occur if:
CMYK toner images exist around clear toner images.
When using smooth paper.
There is a high density KCMY image for which large amounts of toner are not transferred. (This problem often occurs for Blue (Cyan + Magenta), a color for which unprinted areas are particularly obvious.)
