I assumed you are using a digital copier/printer, in digital machine there were 2 kinds of diagnosing a problem, and you are right with your observation Copying and Printing, and each have two separate troubleshooting.
If you say that in printing is fine, then the problem is with the scanning part which is in your Optical Unit, here's some pointers
1- Open the optical glass on the top, with screws
2- Observed the optical unit with 3 reflective glass, it could be dirty
3- the middle of the optical system is called the CCD which converts the image from the reflective mirrors, see if you can find dust and dirt.
4- Check the lamp for any sign of dirt this could cause also some problems.
these are the only areas you need to check, nothing else, and this would surely solve this problem
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