Sharp MX-4140N Operation Manual page 44

USER'S MANUAL - APPENDIX
Repeat steps 7 to 9 to clean all holes (4 holes) in the laser unit.
There are a total of four holes to be cleaned in the laser unit.
Clean all holes.
Replace the cleaning tool.
(1) Engage the cleaning tool onto the boss and turn it around it, and
then put the edge (the cleaner side) on the left hand hook.
(2) Put the right-hand side of the cleaning tool over the hook to place it
on the near side.
(3) Turn the cleaning onto hook.
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4/24/2014