MX-7090N, MX-8090N. Service Assist Guide - Sharp Copying Equipment Service Manual (repair manual). Page 9

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Mottle or Nonuniformity on Heavy paper
11)
Symptom
>
・Density unevenness in solid image of color.
・Use the Paper Settings function.
Select secondary transfer setting.
Increase set value.  (Max:80/color)
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12)
Ghost (Photoreceptor memory)
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Symptom
>
・An image pattern positioned forward in the
paper feed direction appears in the halftone
image at a pitch of 157 mm.
・Setting Change (Primary Transfer Setting)
Select 
WKHappropriate mode
     Decrease the primary transfer current value         
     of  the color used in the image.
     Decrease the value while paying attention to
     the image density.
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