Canon D1 Service Manual page 49

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Parts Replacement and Cleaning Procedure > Main Units/Parts (Reader) > Removing the ADF Scan Glass > Action to Take after Replacing the ADF Scan Glass
Read the white level in the BOOK mode. (Check the transparency of the glass for BOOK
mode.)
4) Place a sheet of paper that the user usually uses on the DF, enter the service mode, and
then select COPIER > FUNCTION > CCD > DF-WLVL4.
Read the white level in the DF mode (stream reading). (Check the transparency of the
glass for stream reading.)(Read both sides of the chart.)
4 Parts Replacement and Cleaning Procedure > Main Units/Parts (Reader) > Removing the ADF Scan Glass > Action to Take after Replacing the ADF Scan Glass
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