Oce TDS800 User Manual page 207

Clean the white reference roller over it's entire circumference with a soft cloth
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with a small quantity of Cleaner A.
For safety information see 'Safety data sheets' on page 260.
Press at the left and right side of the scanner to close the top cover of the
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scanner (see Figure 118).
[118] Close the top cover of the scanner
Turn on the scanner.
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Maintenance 207