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Solution:

Clean the blade.

1Open the front cover of the multi-folding unit.

2Pull the multi-folding unit out.

Machine body illustration

3Turn the N11 dial counterclockwise until the blade appears.

The blade is located in the right part of the multi-folding unit.

Machine body illustration

4Wipe the tip and top of the blade with a soft dry cloth.

Be careful not to damage the blade.

Machine body illustration

5After cleaning, restore the machine so that it resumes operation.

Apply multi-sheet folding and print 3-5 copies. The paper soil will disappear.