Canon imageRUNNER 2520 Series, Service Manual, Page: 156 / 402

1. Place a sheet of paper that the user usually uses on the
platen glass, enter the service mode, and then select
SCAN > READER > FUNCTION > CCD > DFWLVL1.
Read the white level in the BOOK mode. (Check the
transparency of the glass for BOOK mode.)
2. Place a sheet of paper that the user usually uses on the
DF, enter the service mode, and then select SCAN >
READER > FUNCTION > CCD > DF-WLVL2.
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.)
3. Place a sheet of paper that the user usually uses on the
platen glass, enter the service mode, and then select
SCAN > READER > FUNCTION > CCD > DFWLVL3.
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 SCAN >
READER > 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.)
Removing the Platen Glass
1. Open the platen cover (platen board cover/ADF).
2. Remove the glass retainer.
• 2 screws
2x
CAUTION:
When removing the platen glass, take care not to touch
the following parts with your fingers:
• Glass surface
• Standard white plate
Soils on these parts may cause white/black lines on
images.
If they are soiled, clean them with a lint-free paper
moistened with alcohol.
■ Action to Take after Replacing the
Platen Glass
Take the action stated below in the service mode.
CAUTION:
Be sure to make the white plate data adjustment before
ADF white level adjustment.
W-PLT-X
W-PLT-Y
W-PLT-Z
4. Disassembly/Assembly
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