Color Laserjet 4600dn has faded output

Color LJ 4600dn has faded pinkish print output on the upper right half of the page when printing pictures. Any ideas of what it could be?  
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I know this is a different model printer, but please see the attached file as it may be a similar problem/fix

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jp_techAuthor Commented:
I will check this out thx.
jp_techAuthor Commented:
SnowWolf thanks for this pdf file it helped me fix the printer.   As the document describes my problem was a dirty laser scanner assembly.  
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