ADF may come as a option if you have a DF-628 get to the installation manual there in detail you can follow all mechanical adjustments first then need the test chart that comes with adf its white with black border check where the user manual is stored in holder install tech should leave it there and follow all steps using this chart . Copier addict is correct to also use bird test page using border outline as a reference to test skew in adf. there is also a spec it may be plus or minus 2 mm.
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