Originally Posted by
PXRebirth
I know this is an aging post, but found the following in the field that may be useful to someone:
I had this error recurring on a 6055 that I just could not shake. I had replaced the flat ribbon cable, and the reader controller. Cleaned the dickens out of the white plate. Reset and manually re-entered all Rcon settings. And was about to replace the scanner itself when it was discovered that the mylars that sit above the CCD were coated from the inside with dust. This was causing the back-side shading error by causing the shading operation to fail. I was able to peel the mylars back and gently clean them. Then blow out the CCD unit with canned air to clear any other dust that may be hanging around in there.
The mylars should really be crystal clear (or at least are when new) but will glaze over with dust over time. I do not believe these are orderable parts from Canon which is a real shame. To replace the scanner is quite expensive.
Hope this helps someone!
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