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Cleaning in the CCD unit (Mirror No. 1 - 5)
1) Remove the CCD unit. (Reference)
2) Remove the LED unit.
2 screws
2 connectors
3) Clean mirror No. 1 - 4 with lint-free paper.
4) Clean the mirror No. 5 with its dedicated cleaning tool.
4-1) Remove the cleaning tool inside the reader unit.
4-2) Dry-clean the mirror No. 5 with the cleaning tool.