We have an refurbished ir 8500, copier has a light background tone. All coronas are new, new drum, developer unit rebuilt, fuser rebuilt. Please help! 
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What about test pages.
How does a PG4 look like?
Or are these copies made from the glass.
If so,make sure the optics are clean and also the white plate and do a CCD adjust. -
Ir 8500
Pg 4 has a background tone top and bottom, middle is lighter.Comment
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What kinda toner do you use, original or OEM?a machine is only as good as your tech : source:screwtape ; the scary oneComment
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ir 8500
Canon gpr-7Comment
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Is potential control on or off.Comment
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With everything you've replaced I might start suspecting the laser. If you have one on hand try it out.Is the glass half full or half empty? I say neither. The glass is obviously full, full of potential. The potential to hold more water or the potential to quench a thirst. Life is all about how you see it.Comment
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could you post a scanned image of the problem copy/printa machine is only as good as your tech : source:screwtape ; the scary oneComment
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toner save
Check to see if toner save in on. Service mode - copier/option/body/cotdpc-d = 0Comment
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